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Below Below are the the 8 steps we use use in our crankshaft remanufacturing remanufacturing process. proces s. You can scoll s coll down to to view view all each step s tep or use use th box to to go directly to a certain certain step. P ressing ressing the orange arrow buttons buttons will bring you back to the top top of the page.
Crankshafts are removed from the engine blocks so a visual inspection of the crank casting can be done. Crankshafts with b keyways, journals spun beyond machining specs or worn thrusts surfaces will be discarded. Adhering to strict quality stand Promar will never use a welded shaft. Once qualified in preliminary inspection, the crank is then sent for initial cleaning.
Dirty Crankshaft
The The fir first sto stop for for a qua qualifi lifie ed cra cranksh nksha aft dur during our our cra cranksh nksha aft repai pair pro process cess is our our AXE AXE SW20 SW20 OS spr spray cle cleaning ning syst syste em. Wi Wi
twice the spraying power and dramatically increased number of multi-integrated spray nozzles, the state of the art system as Promar that all oil, dirt and foreign material is removed from even the smallest of oiling holes. The cleanliness of this crank is essential to insure an accurate magnetic particle crack detection test.
Crankshaft After Washing Process
AXE SE20 OS Spray Cleaning Sys
Magnetic particle inspection is the most definitive methods of detecting cracks and imperfections in any ferrous engine parts. procedure assures the highest quality cores for crankshaft remanufacturing.
DCM-2400 Magnetic Particle Inspection
Continuing our efforts to produce the best and most reliable crankshaft repair product in the industry, we utilize the Berco R 225A precision crankshaft grinder. Coupled with our expert craftsmen, this state of the art unit incorporates rigid construction precise controls; affording Promar customers the most accurately ground crankshafts possible. Precise controls afford precis grinding, which is followed up by brush cleaning and chamfering of all oil passages.
Crankshaft Grinding Process
Berco RTM-225A Precision Crankshaft Grinder
Following these precise machining procedures, our cranks undergo a second high pressure wash cycle to guarantee the removal of any debris that may have adhered become dislodged during the grinding process. Absolute cleanliness is necessary f next step of crankshaft remanufacturing, which is micro-polishing and or balancing needed.
AXE SW20 OS Spray Cleaning System
Promar's digitally controlled balancer is extremely accurate, producing precise balanced crankshafts during repair, it has the to measure unbalance from .01 to 1,000 grams on work pieces weighing up to 500 lbs. (226kg). This process using the Sun DCB 2000 is optional for this application.
Sunnen DCB-2000
Crankshaft Balancing Process
Promar uses a crankshaft micro polisher with a rigid polishing system during remanufacturing. The QPAC Q190-38-3 has a s abrasive tape that wraps around the journal and is backed up with a shoe. This shoe applies equal pressure all the way aro journal while it is being polished. Traditional polishing techniques use a manually operated belt sander that can alter the geometry of the journal, slightly crea some taper or out-of-roundness. If the surface finish on the crankshaft journal is not right or the geometry is slightly off, the bearings will suffer the consequences when the crankshaft is put into service. While polishing in one direction and then
automatically polishing in the opposite direction, the QPAC system leaves a better finish and eliminates microscopic peaks t cause premature bearing failure. The finishing process always ends in the same direction as the engine rotation. For thrust surfaces, a separate polishing arm is used. Polishing the thrust surface on the crank is important to minimize the thrust failure on vehicles that have electronic torque converters. With many of today's engines requiring extremely smooth journal finishes (as low as 6 Ra or less) because of tighter bearing clearances and the use of thinner viscosity 5W-30 motor oils, there is little margin for error. In one pass the QPAC takes the f down to 6 Ra or less and provides a superior finish to any polishing systems out there today.
QPAC Crankshaft Micro-Polisher
Crankshaft Ra Check
Our spray cleaner system carries twice the horsepower and twice the amount of nozzles than most spray cabinets. This mac assures Promar that any dirt, metal or oils from crankshaft repair and remanufacturing are removed before final assembly. T the third and final wash performed after the micro polishing.
Crankshaft Rinsing Process Completed & Wrapped Crankshaft
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