4200 Wet Sump Engine Overhaul - Course Notes
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4200 Wet Sump - Engine Overhaul Course 09-11/12/2008 2001 – F136R – M138 – 4.2L Dry Sump 2003 – F136S – M139 – 4.2L Dry Sump – DuoSelect vehicles only Changes; Intake manifold went from alloy to plastic Camshafts went from 1 piece to an interference fit The last of the R engines had S cams. Profiles and still different. The intake timing was the same but the exhaust was different. Gransport was a F136R engine with different porting and ECU map. Only the intake cam has a timing variator and also a pickup sensor. The LH intake cam of the R engine has the HP oil pump drive at the rear. There is also a difference in length at the front of the cam between L+R. 80% of the components are different from the Dry to Wet Sump Engines 2007 – F136UC – M139A – 4.2L Wet Sump 2007 – F136UD – M145A – 4.2L Wet Sump Differences; Engine ECU mapping Naming is also different for model designation. 2008 – F136YC – A920 – 4.7L Wet Sump – 450Hp – Alfa Romeo 8C 2008 – F136YE – M145 – 4.7L Wet Sump – 440Hp – GranTurismo S Differences; YC has no oil level sensor YC has oil temp sensor in the valley behind the oil pressure switch Engine ECU Mapping Rear Exhaust section on the YC engine is the same as a Ferrari 430 2008 – F136YG – M139 – 4.7L Wet Sump – 430Hp Differences; Drop in 10Hp possibly caused by no exhaust valves The YG intake timing variator has a range of 60°, previously on 50° Basic timing value is 10° more retarded which increases idle quality. YG engine is the first to use the Bosch Motronic ME9. Others are ME7. The ME9 unit has been moved from the passenger floor to the engine bay.
Transcript of 4200 Wet Sump Engine Overhaul - Course Notes
4200 Wet Sump - Engine Overhaul Course09-11/12/2008
2001 – F136R – M138 – 4.2L Dry Sump2003 – F136S – M139 – 4.2L Dry Sump – DuoSelect vehicles only
Changes;Intake manifold went from alloy to plasticCamshafts went from 1 piece to an interference fitThe last of the R engines had S cams. Profiles and still different.The intake timing was the same but the exhaust was different.Gransport was a F136R engine with different porting and ECU map.Only the intake cam has a timing variator and also a pickup sensor.The LH intake cam of the R engine has the HP oil pump drive at the rear.There is also a difference in length at the front of the cam between L+R.
80% of the components are different from the Dry to Wet Sump Engines2007 – F136UC – M139A – 4.2L Wet Sump2007 – F136UD – M145A – 4.2L Wet Sump
Differences;Engine ECU mappingNaming is also different for model designation.
2008 – F136YC – A920 – 4.7L Wet Sump – 450Hp – Alfa Romeo 8C2008 – F136YE – M145 – 4.7L Wet Sump – 440Hp – GranTurismo S
Differences;YC has no oil level sensorYC has oil temp sensor in the valley behind the oil pressure switchEngine ECU MappingRear Exhaust section on the YC engine is the same as a Ferrari 430
2008 – F136YG – M139 – 4.7L Wet Sump – 430HpDifferences;
Drop in 10Hp possibly caused by no exhaust valvesThe YG intake timing variator has a range of 60°, previously on 50°Basic timing value is 10° more retarded which increases idle quality.YG engine is the first to use the Bosch Motronic ME9. Others are ME7.The ME9 unit has been moved from the passenger floor to the engine bay.The communication for ME9 with SD3 is via the C-CAN.There is no longer a K line connection to the NCM.
All of the technical specifications are the same between the wet and dry engines.The main reason for changing from a Dry to Wet Sump was;
Lower fuel consumptionAdvantage of ground clearance not taken advantage ofCost to build and repair is lessLess engine power needed to drive oil pumpWet Sump engine is quieterWet Sump is more reliableThe oil pump on the Dry Sump engine is very costly and is not reliable.
Dry Sump Crankcase compression 1.4 / 1Wet Sump Crankcase compression 1 / 1 – no compression = no loss of power
Measure 1.75mm of piston down stroke to find 15°ATDC – 4.2L Wet Sump EngineMeasure 1.86mm of piston down stroke to find 15°ATDC – 4.7L Wet Sump Engine
The timing variator must be in the locked position with the reference marks together.Possible rattle on startup can be caused by the locking pin not engaging and no oil pressure on start up.
Cooling SystemElastic belt on Wet Sump engineThere are not as many concerns with the water pump on the Wet Sump engine.There have been some problems with the thermostat sticking open.The heat exchangers leak on the Dry Sump engine.The heat exchanger was upgraded for the Wet Sump engine.
Oil Filters are different between the Dry and Wet Sump engines. They are not interchangeable. The filter for the Wet Sump engine has an anti return valve to hold oil in the engine when it is switched off.
Piston Pin offset is 0.8mm in the opposite direction to crank rotation.Pistons are different L-R. The valve recess is on opposite sides.ZYL stamped on the piston is the abbreviation for Piston in German.
Con RodsThere are 2 different classes of con rods. A “X” or a “Y” indicates the size of the big end.All con rods are the same weight.The class needs to be checked so that the correct bearings can be ordered.Crank journals are also classed “X” and “Y”.The bearings are ordered individually. Use the table to choose the correct colours.There are 3 bearing sizes. Standard – 1st Oversize – 2nd OversizeAll engines leaving the factory should have the smaller “X” class.Crank main journals are also classed but with an ”A” and a “B” instead.
The piston castings are all identical.The gudgeon hole is drilled at the opposite offset.Con rod big end bolts are one use only.Don’t trust the markings. Always have the sizes checked to be sure.If any of the parts are out of the tolerance they must be replaced.Parts cleaned with an ultrasonic cleaner should not be left in it for more than 10mins.The main bearing class “A” or “B” should be stamped on the outside of the crankcase.
