287 HO 03 M272 (FAH) 08-05-04

M272 Engine

287 HO M272 (FAH) 10/05/04

1

Titles you can't find anywhere else

Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.



















Objectives Students will be able to: •

iden identif tify y diffe differen rence ces s bet betwee ween n M112 M112 an and d M272 M272

•

expl explai ain n the camsh camshaft aft adjust adjusters ers op opera erati tion on

•

iden identi tify fy ma majo jorr com compo pone nent nts s of of the the M27 M272 2

•

expl explai ain n fun funct ctio ion n of of the the swir swirll fla flaps ps

•

expl explai ain n funct function ion of of the tem temper peratu ature re manag managem ement ent sys system tem



















Contents Comparison Highlights Motor mechanicals Oil level switch Crankcase ventilation Cylinder head Intake manifold ME 9.7 Crank sensor O2 sensors Three way catalytic converters

4 6 9 12 16 18 29 40 46 49 50



















M272 M2 72 – M1 M112 12 Co Comp mpari ariso son n M272

M112

3.5 litre

3.2 litre

268 hp @ 6000 rpm

214 hp @ 5700 rpm

258 lb-ft @ 2500 to 5000 rpm 228 lb-ft @ 5700 rpm Compression Ratio 10.7 : 1

Compression Ratio 10.0 : 1

Sparkplugs per cylinder 1

Sparkplugs per cylinder 2

ME 9.7

ME 2.8



















Comparison 190 kW

200

Red line (Dash) = M112 3 valve

Blue line (solid ) = M272 4 valve

180 160

180 kW

400 380 360

350 Nm

W k r 140 e w o 120 p

340 320 M272

100 80

300 M112

280

m N e u q r o T



















New M272 introduced in the new SLK 171 Lets look at some highlights





















M272 HighLights •

M112 re replacement

•

3 5 lilitre displacement



















M272 HighLights • 90 degree V-6 • Two sta stage ge In Inta tak ke mani manifo fold ld



















Lets take a look at what changed mechanically



















Motor Mechanicals

• Based Based off off of M112 M112 engine engine



















Crankshaft

• Crankshaft Crankshaft lighter lighter as compared to M112







































Balance Shaft





























































































































































































































































































Variable Length Intake Manifold • Engine Engine load over over 50% from approx. approx. 1750 RPM intake flaps closed (long runner) • Better cylinde cylinderr filling filling and increased increased torque • Above 3900 3900 RPM switchover switchover solenoid solenoid deactivated via ME intake flaps open (short runner) • Incoming Incoming air follows short runner • Unlike M112, M272 M272 has two diaphragm diaphragm

Vacuum applied

Long runner



















Intake Functional Diagram



















Swirl Flaps • Under certain certain operating operating conditions conditions intake intake air is swirled via swirl flap for improved mixture process • Vacuum diaphragm diaphragm driven driven by ME ME controls flap position • Swirl flap flap position position sensors sensors (hall sensors) sensors) monitor monitor 2 magnets attached to swirl flap actuating shafts to determine flap position (activated/not activated)

B28/9

B28/10

Swirl flap position sensors



















Swirl Flaps



















Swirl Flaps





















Swirl Flap Operating Parameters



















Swirl Flap Functional Diagram 12 – Intake manifold manifold 1 – Swirl Swirl flap flap 22/9 – Aneroid Aneroid capsule capsule swirl flap Switchover B11/4 – Coolant Coolant temperature temperature sensor sensor



















ME 9.7 Inputs



















ME 9.7 Control Module function: • Cylinder Cylinder sequenti sequential al injectio injection n



















ME After Run Process •

ME perfo performs rms an a afte fterr run process process whe when n circui circuitt 15 is swit switche ched d off off

•

After Aft er run run is is dete determi rmined ned by ME ME and and requ require ired d to store store inpu inputs ts





















ME 9.7 Inputs/Outputs



















ME 9.7 Inputs/Outputs Legend



















ME 9.7 Network Signals



















ME 9.7 Network Signals

























































































































































































































































Fuel Pump Control • Fuel pump controll controlled ed via fuel pump pump relay (N10/2kA) • Fuel pump Relay Relay located located in rear rear SAM (N10/2) • Fuel pump relay relay energi energized zed via via ME



















Fuel Supply Circuit In Tank Pressure Regulator (3.8 bar) Fuel Filter

Supply

Return Fuel



















Access Point To Fuel Filter and Pump Tank Pressure Sensor

Connector For pump And level sensor



















Fuel Pressure Regulator Filter Pressure regulator A

B

C A-from pump B-return to splash bowl C-filtered fuel to engine



















Fuel Level Sensor





















Splash Bowl pump



















Fuel Pump





































Speed Sensitive Power Steering



















Speed Sensitive Power Steering •

Gives Gives the the cust custome omerr firmer firmer fee feell in steeri steering ng a att higher higher speeds speeds and more assist for parking maneuvers at slower speeds ME 9.7 now controls controls functio functions ns of the Speed Speed Sens Sensiti itive ve Power Power







































Speed Sensitive Power Steering























































287 HO 03 M272 (FAH) 08-05-04

Recommend Documents