K 30 1 Ton Pickup 4WD V8-379 6.2L DSL VIN J FI (1982)
Crankshaft Main Bearing Seal: Customer Interest
Diesel Engine - Rear Main Oil Seal Leakage
Number:
86-102
Section:
6A
Date:
JUNE, 1986
Subject:
TWO-PIECE REAR MAIN SEAL INSTALLATION
Model and Year:
1982-86 C,K,G,P - 1,2,3 WITH 6.2L DIESEL ENGINE
TO:
ALL CHEVROLET DEALERS
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 two-piece 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.
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)
NOTE:
Make certain that both seals are installed correctly by having the side which has "outside" printed on it facing
towards the transmission.
12.
Insert the second half of the seal into the opposite side of the cylinder block groove. Only 1/2" will be inserted into the
block, the remainder should be snug against the crankshaft.
NOTE:
Contact ends of seal should now be located at the (4) and
(10)
or (8) and (2) o'clock positions. The seal is now installed around the crankshaft. (Figure No. 1) This aligns the rear main
bearing cap and seal lips.
13.
Apply a thin film of anaerobic sealer, P/N 1052756, to the cap to assist in sealing the block mating surface. (Figure No. 2)
CAUTION: Do not put sealant in the bearing cap oil relief slot.
14.
Follow directions for usage of GM P/N 1052621 sealer (equivalents are Loctite 414 or Fel Pro 361) and apply two drops
into the center lower bearing cap seal groove.
15.
Install the rear main bearing cap.
NOTE:
To prevent damage to the rear main bearing cap, it is to be tapped into the block using a brass or leather hammer.
The new seal is used as a guide. The cap must NOT be pulled into the block with the bolts. Lubricate bolt threads
with engine oil and install. Torque bolts to specifications:
