90CS Quattro V6-2.8L (AAH) (1994)
Cylinder Head Gasket: Technical Service Bulletins
Upper Engine - Oil Leaks
Group: 15
Number: 94-02
Date: Aug. 1, 1994
Subject:
Engine Oil Leaks, Upper
Model(s):
90, 100, Engine Code AAH (V6 Engine) All m.y.
Condition
Accumulation of oil in the V6 engine intake valley because of:
^ Leaking cylinder head gaskets
^ Leaking valley pan gasket
Caution!
0il leaks from the intake valley can be mis-diagnosed as a rear crankshaft oil-seal leak. Also see Technical Bulletin 94-04, Repair Group 17.
Production
Modified cylinder head gaskets:
Part Number:
078 103 383 E
VIN Number:
4APN100660
8GPA007244
Valley pan gasket:
Part Number:
078 103 771
Caution!
Part numbers are for reference only Always check with the parts department for the latest in formation.
Service
-
Use a small flashlight to inspect the intake valley area to determine if the oil leak is coming from the valley pan cover or the head gaskets.
Leaking head gaskets, checking
-
Check the turning torque (cold) on the cylinder head bolts (in the tightening direction) by using a beam or dial type torque wrench.
If it requires less than 40 Nm (30 ft lb) to turn any one head bolt:
-
Loosen and retorque each bolt one at a time using the following procedure.
Cylinder head bolt torquing procedure