Suburban 1/2 Ton 2WD V8-379 6.2L DSL (1986)
Crankshaft Main Bearing Seal: Customer Interest
Diesel Engine Rear Main Seal - Leaking
NUMBER:
86-B-85
GROUP:
6A - Diesel Engine
DATE:
May, 1986
SUBJECT:
TWO-PIECE REAR MAIN SEAL INSTALLATION
MODELS:
1982-1986 C, K, G, P, - 1, 2, 3 WITH 6.2L DIESEL ENGINE
Some 6.2L diesel engines may experience leakage from the "rope type" rear main oil seal used in production. In order to correct this condition a
twopiece Viton lip seal (P/N 23500417, two required) is available and should be used to replace the current rope seal when servicing for this condition.
The new seal is an effective service replacement for rear main oil seal leak conditions and can be installed without removing the crankshaft. Prior to
installation of the new seal, the engine's crankcase ventilation system must be thoroughly inspected. All tubes, rubber hoses, and the CDR valve must be
checked. Specifications for the crankcase ventilation system are one inch of water pressure at idle to approximately two to five inches of water vacuum at
2,000 RPM (or full load), checked at the engine dipstick tube. The checking procedure is outlined in the light Duty Truck Service Manual.
SEAL INSTALLATION PROCEDURE
After confirming that the ventilation system is functioning correctly, use the following procedure to replace the seal.
1.
Drain engine oil.
2.
Remove oil pan.
3.
Remove oil pump.
4.
Remove rear main bearing cap.
5.
Remove the upper and lower rope seal.
6.
Clean the upper and lower seal grooves, bearing cap slot, cylinder block and oil pan rails with a chlorinated solvent such as spray carburetor
cleaner. Do not use cleaners such as mineral spirits that leave a film that RTV will not stick to. All surfaces must be clean and dry before applying
sealant.
7.
Place a piece of plastigage material on the rear main journal.
8.
Install the rear main bearing cap and bearing, and torque to 95 N-m (70 ft.lbs.)
9.
Remove the bearing cap and check the bearing clearance. If bearing clearance is outside the specification (.0022"-.0037"), correct as necessary.
10.
Apply a thin coat of engine oil on both seal lips where they contact the crankshaft.
-INSTALLING SEALS
11.
Roll one piece of the seal into the cylinder block upper seal groove until 1/2" of the seal's one end is extending out of the block. (Figure No. 1)
