SEBF8002 - Visual Inspection of Valves, Valve Springs, and Valve Bridges {1102, 1108, 1109, 1121, 1123}.pdf

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Pautas de reutilización y recuperación Visual Inspection of Valves, Valve Springs, and Valve Bridges {1102, 1108, 1109, 1121, 1123} Númer úmero o de medi medio -SEBF -SEBF8 8002002-26 26

Fecha Fecha de publ publiicaci cación ón -14 -14/08/ /08/20 2015 15

Fecha Fecha de actu actual aliizaci zación ón -12/ -12/0 08/20 8/2016 16

Caterpillar: Confidential Yellow

i06781506

Visual Inspection of Valves, Valve Springs, and Valve Bridges {1102, 1108, 1109, 1121, 1123} SMCS - 1102; 1108; 1109; 1121; 1123

Caterpillar Products All

Introduction Table 1 Revision

Summary of Changes in SEBF8002

26

Added "C175 valve springs need to be replaced at full life overhaul. C175 valve springs can be reused if they pass visual inspection ." statement in the "Valve Springs" Section.

25

Added new serial number prefixes.

24

Removed recommendation of exhaust valve reuse

23

Added new serial number prefixes.

22

Updated the spring tester in the "Test "Test Procedure for Valve Springs" section.

© 2016 Caterpillar All Rights Reserved. This guideline is for the use of Cat dealers only. Unauthorized use of this document or the proprietary processes therein without permission may be violation of intellectual property law. Information contained in this document is considered Caterpillar: Confidential Yellow. This Reuse and Salvage Guideline contains the necessary information to allow a dealer to establish a parts reusability program. Reuse and salvage information enables Caterpillar dealers and customers to benefit from cost reductions. Every effort has been made to provide the most current information that is known to Caterpillar. Continuing improvement and advancement of product design might have caused changes to your product which are not included in this publication. This Reuse and Salvage Guideline must be used with the latest technical information that is available from Caterpillar. https://sis.cat. https://sis.cat.com/sisweb/sisweb/tech com/sisweb/sisweb/techdoc/ doc/tech techdoc_ doc_print_p print_page age.jsp?retu .jsp?returnurl= rnurl=/sisweb/sisweb/mediase /sisweb/sisweb/mediasearch/mediah arch/mediahea eaderinfof derinfoframeset.jsp& rameset.jsp&calledpa calledpage=/sisweb/… ge=/sisweb/… 1/50 1/50

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For questions or additional information concerning this guideline, submit a form for feedback in the Service Information System. to address an urgent issue, use the following resources to communicate your request to Caterpillar Repair Process Engineering: Caterpillar Dealer Technical Communicator Dealer Solution Network Caterpillar Technical Representative Knowledge Network

Canceled Part Numbers and Replaced Part Numbers This document may not include canceled part numbers and replaced part numbers. Use NPR on SIS for information about canceled part numbers and replaced part numbers. NPR will provide the current part numbers for replaced parts.

Important Safety Information

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Work safely. Most accidents that involve product operation, maintenance, and repair are caused by failure to observe basic safety rules or precautions. An accident can often be avoided by recognizing potentially hazardous situations before an accident occurs. A person must be alert to potential hazards. This person should also have the necessary training, skills, and tools to perform these functions properly. Safety precautions and warnings are provided in this instruction and on the product. If these hazard warnings are not heeded, bodily injury or death could occur to you or to other persons. Caterpillar cannot anticipate every possible circumstance that might involve a potential hazard. Therefore, the warnings in this publication and the warnings that are on the product are not all inclusive. If a tool, a procedure, a work method, or operating technique not recommended by Caterpillar is used, ensureit is safe to use. Ensure that the product will not be damaged or made unsafe by the operation, lubrication, maintenance, or the repair procedures that are used.

Improper operation, lubrication, maintenance or repair of this product can be dangerous and could result in injury or death. https://sis.cat. https://sis.cat.com/sisweb/sisweb/tech com/sisweb/sisweb/techdoc/ doc/tech techdoc_ doc_print_p print_page age.jsp?retu .jsp?returnurl= rnurl=/sisweb/sisweb/mediase /sisweb/sisweb/mediasearch/mediah arch/mediahea eaderinfof derinfoframeset.jsp& rameset.jsp&calledpa calledpage=/sisweb/… ge=/sisweb/… 2/50 2/50

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Do not operate or perform any lubrication, maintenance or repair on this product, until you have read and understood the operation, lubrication, maintenance and repair information.

Safety precautions and warnings are provided in this manual and on the product. If these hazard warnings are not heeded, bodily injury or death could occur to you or to other persons. The hazards are identified by the safety alert symbol which is followed by a signal word such as danger, warning, or caution. The "WARNING" safety alert symbol is shown below.

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This safety alert symbol means: Pay attention! Become alert! Your safety is involved. The message that appears under the safety alert symbol explains the hazard. Operations that may cause product damage are identified by "NOTICE" labels on the product and in this publication. Caterpillar cannot anticipate every possible circumstance that might involve a potential hazard. The safety information in this document and the safety information on the machine are not all inclusive. Determine that the tools, procedures, work methods, and operating techniques are safe. Determine that the operation, lubrication, maintenance, and repair procedures will not damage the machine. Also, determine that the operation, lubrication, maintenance, and repair procedures will not make the machine unsafe.

The information, the specifications, and the illustrations that exist in this guideline are based on information which was available at the time of publication. The specifications, torques, pressures, measurements, adjustments, illustrations, and other items can change at any time. These changes can affect the service that is given to the product. Obtain the complete, most current information before you start any job. Caterpillar dealers can supply the most current information.

Summary This guideline contains the correct tooling and procedures to measure, clean, and reuse Caterpillar valves, valve springs, and bridges. This guideline references the procedures in Reuse and Salvage Guideline, SEBF8162, "Measuring Procedures and Salvage Procedures for Cylinder Head Assemblies and Related Components". By following this guideline, reused components can be expected to give normal performance until the next overhaul if the components are used in the same application. Do not install the component if the component is not reusable. During salvage operations, correct any conditions that might have caused the original failure.

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Safety

Personal injury or death can occur from not following the proper procedure or the recommended tooling. To prevent the possibility of injury or death, follow the established procedure using the recommended tooling.

References Reference: Reuse and Salvage Guideline, SEBF8034, "Valve and Valve Spring Specifications" Reference: Reuse and Salvage Guideline, SEBF8162, "Measuring Procedures and Salvage Procedures for Cylinder Head Assemblies and Related Components" Reference: Special Instruction, SMHS6998, "Instructions for the Use of 5P-6518 Dial Indicator Fixture GpParts Reusability" Reference: Catalog, NENG2500, "Dealer Service Tool Catalog" Reference: Reuse and Salvage Guideline, SEBF9006, "Specifications for Cylinder Head Assemblies on CSeries Engines" Reference: Truck Engine News, SEBD6847

Required Tooling Table 2 Part Number

Description

6V-2010 6V-2010

Polishing Stone

FT-1753

Valve Stem Protector Protec tor

6V-0087 6V-0087

Valve Stem Gauge Gp

6V-7059

Micrometer

6V-2034 6V-2034

Micrometer Adapter

441-0714

Spring Tester

9U-5360(1) Valve Face Grinder 9U-5374(2) 6V-2033

Brush

6V-2032

Adapter


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5P-6518


Dial Indicator Fixture Gp

(1) 115 Voltage (2) 230 Voltage

Valves Nomenclature of the Valve

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Valve with a single keeper (1) Retaining groove for the valve spring (2) Valve stem (3) Area of the fillet (4) Valve head (5) Valve face

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Valve with a double keeper (1) Retaining grooves for the valve spring (2) Valve stem (3) Area of the fillet (4) Valve head (5) Valve face

Procedure to Clean Valves https://sis.cat. https://sis.cat.com/sisweb/sisweb/tech com/sisweb/sisweb/techdoc/ doc/tech techdoc_ doc_print_p print_page age.jsp?retu .jsp?returnurl= rnurl=/sisweb/sisweb/mediase /sisweb/sisweb/mediasearch/mediah arch/mediahea eaderinfof derinfoframeset.jsp& rameset.jsp&calledpa calledpage=/sisweb/… ge=/sisweb/… 5/50 5/50

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The valve on the left has not been cleaned. The valve on the right has been cleaned with the sodium bicarbonate method.

Solvents

If there is only a small amount of carbon residue on the valves, use a good cleaning solvent to clean the valves. Use one or more of the following methods to clean hard carbon deposits. Sodium Bicarbonate

Use the sodium bicarbonate method to remove oil, grease, and carbon deposits from the area of the fillet, the valve face, and the valve head. For the sodium bicarbonate cleaning method, use a blasting crystal size of 70 microns (0.0028 in). For best results, use 163-3951 Blast Media which is specially formulated to remove deeply embedded carbon deposits. Use a number four nozzle with a pressure of 483.0 to 550.0 kPa (70.00 to 80.00 psi). Use a flow rate of 2100.0 L/min (554.76 US gpm) of compressed air. Set the differential pressure at 4.45 N (1.000 lb) to control the flow of the media for blasting in the range of 3.34 N (0.750 lb) per pe r minute. There are many benefits to using sodium bicarbonate as the media for blasting. Unlike other types of blasting media, grease and oil does not need to be cleaned from the valves before blasting. Sodium bicarbonate is soluble in water which provides options for waste disposal. Used sodium bicarbonate can be used as a neutralizer for treatment of waste. Sodium bicarbonate is an environmentally friendly chemical for workers, parts, and the environment. Glass Beads

Use glass beads to remove heavy carbon deposits from the area of the fillet, the valve face, and the valve head. Use glass beads that are 88 to 150 microns (0.0035 to 0.0059 in) with 550.0 to 620.0 kPa (80.00 to 90.00 psi) of air pressure for best results. Glass beads that are 125 to 177 microns (0.0049 to 0.0070 in) through size 74 to 125 microns (0.0029 to 0.0049 in) are acceptable.

NOTICE Never use glass beads that are larger than 230 microns (0.0091 in). Protection of valve stems from glass beads and steel shot is necessary at all times. Do not mix aluminum oxide or any other material with glass beads.


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Note: Do not use glass beads or steel shot in a cabinet that is configured for sodium bicarbonate cleaning. Glass beads and steel shot will not tolerate the grease or oils on the valves and the valves will require a cycle of wash prior to blasting.

NOTICE Do not use the glass bead method to clean the valve stem. The results will be rapid wear of the valve guide. Protection of the stem area from glass beads is important.

Steel Shot

Use steel shot to remove very heavy carbon deposits from the area of the fillet, the valve face, and the valve head. Use size S170 steel shot for best results. Larger sizes of shot can damage the valve.

NOTICE The steel shot will not give an acceptable finish on the valve stem. Use the FT-1753 Valve Stem Protector or similar type of hose on the valve stem to protect the valve stem.

6V-2033 Brush and 6V-2032 Adapter

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6V-2033 Brush and 6V-2032 Adapter

One way to clean valve stems is to use tooling 6V-2033 Brush and 6V-2032 Adapter. Refer to Illustration 6. Tooling (H) is a flap brush with a diameter of 203 mm (8.0 in). The width is 51 mm (2.0 in) and the center hole has a diameter of 76 mm (3.0 in). Tooling 6V-2032 Adapter fits 6V-2033 Brush and 6V-2032 Adapter has a center hole of 13 mm (0.5 in). If necessary, the center hole can be made larger. The best speed for the 6V-2033 Brush is 2100 rpm. Do not use a 3450 rpm motor. A motor that runs at 1725 rpm is acceptable only if the motor does not slow down during cleaning of the valves.


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NOTICE The 6V-2033 Brushcould come apart if it is run faster than 2100 rpm and could result in injury to the operator.

If 6V-2033 Brush is not available, use a Scotch-Brite Type 5A brush. This brush is a fine grade that is used for finishing. Other grades or other brushes from another supplier may result in an incorrect surface finish. Vibratory Cleaning

A vibratory cleaner can also be used to clean the valves if the cleaner gives the correct final surface finish to the valve stem.

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Typical vibratory cleaner

The size and the type of pellet that is used in a vibratory cleaner controls the surface finish of the valves being cleaned. If necessary, polish the valve stem with Scotch-Brite material to get the correct surface finish. If you do not use Scotch-Brite material, check the surface finish on the valves frequently.

NOTICE Do not use a wire brush or wire wheel to remove carbon deposits from valves. Wire brushes or wheels will make scratches on the valves, which can cause a valve failure.

Note: Inspect the area of the retaining grooves of the valves for discoloration before using a vibratory cleaner. After cleaning, apply a light coat of oil on the valves to prevent rust. Note: Do not clean the valves with a grinder that has a Scotch-Brite abrasive disc. Grinding with Scotch-Brite discs creates airborne particles that will contaminate areas of the shop.


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NOTICE Exhaust valves should never be reused. Always replace exhaust valves at overhaul.

Inspection of the Valves To save time, check the condition of the valves before the valves are cleaned, ground, or measured. Area of the Retaining Grooves

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Remove any raised edges with the Scotch-Brite method or use a stone for polishing of a fine grade such as the 6V-2010 Polishing Stone.

Use the valve again.


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Severely Severely damaged valve th at cannot b e reused.

Do not use the valve again.

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The valve has surface wear, but no damage to the sides or the bottom of the grooves. Use Scotch-Brite to polish the area.

Use the valve again. Valve Stem

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This valve has discoloration on the valve stem and b uild-up on the fillet area and the valve face. face. This valve can be reused after cleaning. Never reuse valves that have discoloration in the area of the retaining grooves.

Clean and then reuse the valve


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The valve in Illustration Illustration 11 after the valve has been cleaned.



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Erosion on the valve stem



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Rust can be removed by cleaning.



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The valve stem contains a small mark or a scratch but the stem does not have any raised or sharp edges. The valve is not reusable if the mark is deeper than the stamp of the part number.



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The valve stem has a mark or a scratch with a raised or sharp edge after cleaning with the Scotch-Brite or the vibratory method.


NOTICE Do not use a valve if normal cleaning methods will not remove a raised edge on the part of the valve stem that moves inside the valve guide.


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Grooves cannot be felt with a fingernail.



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Deep grooves that can be felt with a fingernail.



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The arrow shows the location of the weld on the valve stem. The weld line cannot be felt with a fingernail.



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The valve stem shows severe scuffing and/or seizure.



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The valve stem shows moved metal as a result of scuffing damage.



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The chromium coating on the valve is heavily worn. Only a few Caterpillar valves have a chromium coating on the stems.



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Some of the valves have a change in diameter above the area of the fillet. The valves that are used in engines with a 158.8 mm (6.25 (6.25 in) bore have a change in diameter above above the area area of the fillet. This change in diameter is acceptable only if the other valves from the same engine have the same change in diameter.



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Some of the valves are smaller at the indicated points so the area of the fillet makes a smooth transition with the surface of the stem.



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Valve stem with a severe change in diameter.



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Valve stem with severe changes in diameter.



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The valve stem is enlarged from engine operation.


Measurements of the Valve Stem


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Always measure wear on valve stems.

Use a 6V-0087 Valve Stem Gauge Gp or a 6V-7059 Micrometer to measure the diameter of the valve stem. Measure the top and the bottom area that moves inside the valve guide. If a 6V-7059 Micrometer is used to check the diameter of the valve stem, adjust the 6V-7059 Micrometer to the correct dimension for reusability and locked at the minimum diameter. Refer to Reuse and Salvage Guideline, SEBF8034, "Valve and Valve Spring Specifications" or Reuse and Salvage Guideline, SEBF9006, https://sis.cat. https://sis.cat.com/sisweb/sisweb/tech com/sisweb/sisweb/techdoc/ doc/tech techdoc_ doc_print_p print_page age.jsp?retu .jsp?returnurl= rnurl=/sisweb/sisweb/mediase /sisweb/sisweb/mediasearch/mediah arch/mediahea eaderinfof derinfoframeset.jsp& rameset.jsp&calledpa calledpage=/siswe… ge=/siswe…

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"Specifications for Cylinder Head Assemblies on Engines with ACERT Technology" for the correct dimensions for reusability. The valve is worn and the valve must be replaced if the micrometer or the correct gauge slides easily over the stem at any position on the stem. Note: Some valves have a tapered valve stem.

NOTICE Do not use force or roll the valve stem into the gauge or micrometer. Forcing the valve stem can cause early wear on the gauge and incorrect valve stem measurements.


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The micrometer slides over the valve stem.



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Use a 6V-0087 Valve Stem Gauge Gp to check the diameter of the valve stem. A 6V-0087 Valve Stem Gauge Gp will not slide easily over the valve stem.


Area of the Fillet


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The fillet area has significant cracks.



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Normal b ond ing between bet ween the valve val ve head and the material of the t he valve val ve face.



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Do not use any valve that has been damaged in the fillet area.


NOTICE Be careful to prevent damage to the fillet area when the valve is installed, ground, or handled. Valves with damaged fillet areas can cause engine damage.


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The area of the fillet contains erosion.



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The area of the fillet contains foreign material.



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The area of the fillet contains pits of rust, scale, and erosion.



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Rust is removed when the valve is cleaned and there are no pits, deposits, scale, or erosion under the rust.


Valve Head


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Large or deep marks exist on the valve head. Some of the marks are near the edge of the valve head.



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All of the marks are light and are not near the edge of the valve head.



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The valve head is severely damaged.



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The valve head is damaged and cannot be reused.



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The valve head contains a small amount of erosion. Do Do not use a valve if the valve has more erosion erosion than the valve in this illustration.



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The valve head contains too much erosion and cannot be reused.



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The valve head has a cup more than 0.25 mm (0.001 in) deep.



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A small cup is normal even on new valves. Use a straight edge and a feeler gauge to check the valve head for a cup.


Valve Face


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Normal wear on the fillet fille t a rea of o f th e v alve. alv e.



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Too much wear on the valve face.


Procedure to Grind Valves Note: C175 valves are NOT to be ground. The valves are precision machined and the valves do not have enough material to grind successfully. Any attempt to do so will cause the valve to lose durability.

All specifications for grinding valves are given in Reuse and Salvage Guideline, SEBF8034, "Valve and Valve Spring Specifications" or Reuse and Salvage Guideline, SEBF9006, "Specifications for Cylinder Head https://sis.cat. https://sis.cat.com/sisweb/sisweb/tech com/sisweb/sisweb/techdoc/ doc/tech techdoc_ doc_print_p print_page age.jsp?retu .jsp?returnurl= rnurl=/sisweb/sisweb/mediase /sisweb/sisweb/mediasearch/mediah arch/mediahea eaderinfof derinfoframeset.jsp& rameset.jsp&calledpa calledpage=/siswe… ge=/siswe…

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Assemblies on Engines with ACERT Technology". Note: After a valve has been ground, inspect the face and measure the thickness of the lip. Refer to the "Procedure to Measure Valve Lip Thickness" section of this guideline.

Valve Face

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1. Adjust the carriage on the grinder to the correct valve face angle.


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2. Follow the manufacturer's instructions for installation of the valve into the chuck.


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3. Adjust the stop on the carriage for maximum movement to the left.


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4. Always dress the grinding wheel so the grinding wheel does not have any nicks, grooves, or foreign material.


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Valve face that has been unevenly ground

5. Examine the rotating valve in the grinder to determine if the valve is warped or bent. Valves that are warped or bent can cause uneven grinding. Bad maintenance of the grinder will also cause uneven grinding. Valves that are warped must be replaced unless the thickness of the lip is correct after grinding. Do not use the valve again.

6. Adjust the flow of cooling liquid so the flow is directly on the point of contact between the grinding wheel and the valve face. Always wet-grind valves. 7. Follow the manufacturer's instructions to properly grind the valve.


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8. After the valve is ground, inspect the valve face. There must be no grooves, pits, marks, or burns on the face. https://sis.cat. https://sis.cat.com/sisweb/sisweb/tech com/sisweb/sisweb/techdoc/ doc/tech techdoc_ doc_print_p print_page age.jsp?retu .jsp?returnurl= rnurl=/sisweb/sisweb/mediase /sisweb/sisweb/mediasearch/mediah arch/mediahea eaderinfof derinfoframeset.jsp& rameset.jsp&calledpa calledpage=/siswe… ge=/siswe…

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NOTICE If the maintenance on the valve grinding machine is not correct, valve failure is possible. To check the valve grinder chuck, install a new valve in the chuck and use a dial indicator to check the runout on the face of the valve. The runout must not be more than 0.025 mm (0.0010 in). If the dial indicator reads too much runout, the chuck is damaged and needs to be repaired or the bearings are bad or loose. Check the channels that the valve grinding machine slides in. If any movement can be felt, then the channels must be adjusted or a repair must be made. When the valve grinding equipment is in good condition, lapping of the valves is not necessary.

Repair of the Valve Stem End


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The end of the valve stem has not been ground.


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The end of the valve stem has been ground.


The end of the valve stem must be smooth and level. The end of the valve stem should have a maximum surface finish of 0.81 micrometer (32.000 microin). Remove only 0.025 mm (0.0010 in) with each grind. Then inspect the end of the valve stem. Note: All the valves do not need to be the same length.


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Grind the end of the valve stem to create a smooth surface.

Use the valve again if any of the original chamfer can be seen. Remove sharp edges with Scotch-Brite or with an Arkansas stone.


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Procedure to Measure Valve Lip Thickness


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This illustration illustration shows the thickness of the lip on the valve. Use Use either of the following two methods to check thickn ess of the lip.


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Use a 5P-6518 Dial Indicator Fixture Gp to measure the thickness of the lip on the valve.


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Use a 6V-7059 Micrometer with a 6V-2034 Micrometer Adapter to measure the thickness of the lip on the valve.

Measure the thickness of the lip with either a 5P-6518 Dial Indicator Fixture Gp or a 6V-7059 Micrometer with a 6V-2034 Micrometer Adapter. Refer to the Catalog, NENG2500, "Dealer Service Tool Catalog" and Special Instruction, SMHS6998, "Instructions for the Use of 5P-6518 Dial Indicator Fixture Gp-Parts Reusability" for more information. Note: Remove any burrs from the vee blocks on the fixture with a small 6V-2010 Polishing Stone. Burrs can damage the valve stem.

Refer to Reuse and Salvage Guideline, SEBF8034, "Valve and Valve Spring Specifications" or Reuse and Salvage Guideline, SEBF9006, "Specifications for Cylinder Head Assemblies on Engines with ACERT Technology" for the correct thickness of the lip. Note: Some difference in thickness of the lip is permissible. If the thickness of the lip is less than the minimum specification at any point, do not use that valve again.

Valve Springs Inspection and Reuse This section contains graphics of springs that can and cannot be reused. Do not reuse valve springs that this guide recommends not to use again. Note: C175 valve springs must be replaced at full life overhaul. C175 valve springs may be reused at mid-life overhaul if they pass visual inspection


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Nicks and deep scratching scratch ing on the valve val ve spring .

Do not use the spring again.


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Light wear in the first 180 degrees of turn is acceptable.

Use the spring again.


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Rust deposits on the spring.



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Notch es at the end of t he spring sprin g are n ot accep table. tab le.



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19/10/ 19/10/201 2016 6



g 01 3 38 0 3 3

Wear on the valve spring between between the coi ls and on the end of the spring.



g 0 31 5 5 69 6

Spring has wear on the sides and cannot be reused.



39/50 39/50

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g 0 1 33 8 0 38

Use a square or use a straight edge and a feeler gauge to check each valve spring for distortion.

Use the spring again if it passes distortion checks. The spring can be used again if the spring meets the specifications in Reuse and Salvage Guideline, SEBF8034, "Valve and Valve Spring Specifications" or Reuse and Salvage Guideline, SEBF9006, "Specifications for Cylinder Head Assemblies on Engines with ACERT Technology". Note: Do not use a spring again if the spring has more distortion than the dimensions given in Reuse and Salvage Guideline, SEBF8034, "Valve and Valve Spring Specifications" or Reuse and Salvage Guideline, SEBF9006, "Specifications for Cylinder Head Assemblies on Engines with ACERT Technology".

Test Procedure for Valve Springs Note: The specifications in Reuse and Salvage Guideline, SEBF8034, "Valve and Valve Spring Specifications" or Reuse and Salvage Guideline, SEBF9006, "Specifications for Cylinder Head Assemblies on Engines with ACERT Technology" must be used for the following procedures.

1. Adjust the stop at the top of the valve spring tester to compress the spring only to the Minimum Operating Length. 2. Put the spring under compression until the spring is at the Assembled Length. Make a record of the force that is needed to hold the spring at this length. 3. Continue to compress the spring until the spring is at the Minimum Operating Length. Make a record of the force that is needed to hold the spring at this length. 4. Makea comparison of the results to the specifications given in Reuse and Salvage Guideline, SEBF8034, "Valve and Valve Spring Specifications" or Reuse and Salvage Guideline, SEBF9006, "Specifications for Cylinder Head Assemblies on Engines with ACERT Technology".


40/50 40/50

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g 0 36 8 0 56 4

Use 441-0714 Spring Tester to test the springs.

Valve Rotocoils and Locks NOTICE Never reuse valve rotocoils or locks.

Floating Valve Bridges NOTICE Do not attempt to reuse the 6I-1458 Valve Bridge. The 6I-1458 Valve Bridge can cause valve lash adjustment problems on cylinder heads that have been salvaged. Therefore, the 6I-1458 Valve Bridge has been canceled and replaced with the 348-7743 Valve Bridge. If there is trouble setting valve lash after the 348-7743 Valve Bridges are installed, then the 363-3731 Valve Bridges must be used. The 363-3731 Valve Bridges are thinner than the 348-7743 Valve Bridges. Refer to Truck Engine News, SEBD6847 for more information on the application of the 363-3731 Valve Bridges.

3406E and C15 Bridges https://sis.cat. https://sis.cat.com/sisweb/sisweb/tech com/sisweb/sisweb/techdoc/ doc/tech techdoc_ doc_print_p print_page age.jsp?retu .jsp?returnurl= rnurl=/sisweb/sisweb/mediase /sisweb/sisweb/mediasearch/mediah arch/mediahea eaderinfof derinfoframeset.jsp& rameset.jsp&calledpa calledpage=/siswe… ge=/siswe…

41/50 41/50

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g 01 3 3 81 8 4

No p itting itt ing , raised material , wavi ng, or wear steps on top of t he bridge brid ge or in i n the holes ho les on the valve val ve stem.

Use the bridge again.


g 01 3 3 82 9 7

Pitting, raised material, waving, or a wear step on top of the bridge or in the holes on the valve stem.

Do not use the bridge again.


42/50 42/50

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g 01 3 3 82 8 8

The depth of the pocket on the valve stem is less than 6.7 mm (0.26 in). No pitting, raised material, waving, or wear steps.



g0 1 3 38 2 9 1

The depth o f the pocket on the valve stem is greater than 6.7 mm (0.26 (0.26 in) or the pocket of the valve is worn and damaged.


3126B Bridges


43/50 43/50

19/10/ 19/10/201 2016 6



g 01 3 5 24 3 2

No p itting itt ing , raised material , wavi ng, or wear steps on top of t he bridge. brid ge.



g 01 3 5 24 7 5

Pitting, raised material, waving, or a wear step on top of the bridge.



44/50 44/50

19/10/ 19/10/201 2016 6



g0 1 35 2 4 79

No p itting itt ing , raised material , wavi ng, or wear steps in the poc ket for th e v alve alv e st em.



g 0 1 35 2 4 85

Pitting, raised material, waving, or a wear step in the pocket for the valve stem.


3176, C10, and C12 Bridges


45/50 45/50

19/10/ 19/10/201 2016 6



g 01 3 5 24 8 9




g 01 3 5 24 9 1




46/50 46/50

19/10/ 19/10/201 2016 6



g 0 1 35 2 4 92

No p itting itt ing , raised material , wavi ng, or wear steps in the poc ket of t he val ve stem.



g 0 1 35 2 4 93

Pitting, raised material, waving, or a wear step in the pocket for the valve stem.


3500 Bridges


47/50 47/50

19/10/ 19/10/201 2016 6



g 01 3 5 24 9 5




g 01 3 5 24 9 7




48/50 48/50

19/10/ 19/10/201 2016 6



g0 1 35 2 4 98

No p itting itt ing , raised material , wavi ng, or wear steps in the poc ket for th e v alve alv e st em.



g 01 3 5 25 0 1

Pitting, raised material, waving, or a wear step exist in the pocket for the valve stem.


Dowel Valve Bridges 3406, 3408, and 3412 Bridges


49/50 49/50

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g 01 3 5 25 0 5


Use the bridge again. Copyright 1993 - 2016 Caterpillar Inc. Todos los derechos reservados. Red privada para licenciados del SIS.

Wed Oct 19 2016 18:40:34 GMT-0500 (Hora est. Pacífico, Sudamérica) r080am5


50/50 50/50

SEBF8002 - Visual Inspection of Valves, Valve Springs, and Valve Bridges {1102, 1108, 1109, 1121, 1123}.pdf

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