Rear Crankshaft Oil Seal Replacement - GMC G Service Manual

6A6-22 6.2L DIESEL
9. Engine cover.
10. Proper quantity and grade of engine oil. Refer to
MAINTENANCE AND LUBRICATION (SEC. OB).
11. Battery cables.
REAR CRANKSHAFT OIL SEAL
REPLACEMENT
Before a new seal is installed, the CDR and crankcase
ventilation system should be thoroughly inspected and
crankcase pressure should be checked. Refer to DIESEL
EMISSIONS (SEC. 6E2).
The production rear crankshaft oil seal is a "rope" type
seal. The rope seal should be replaced with a two piece lip-
Figure 23 — Applying Sealer to the Rear Main
Bearing Cap
TWO PIECE TYPE SEAL
M Remove or Disconnect
1. Oil pan and oil pump, as outlined previously.
2. Rear main bearing cap.
3. Upper and lower rope seal.
B ln
Clean
• Upper and lower seal grooves and bearing cap slot
with a chlorinated solvent, such as carburetor spray
cleaner.
• Main bearing cap and block mating surfaces.
f^ f] Measure
• Rear main bearing clearance, using plastic gage
material. Refer to the 1988 Light Duty Trucks Unit
Repair Manual. If the clearance is outside specifica­
tions, correct as necessary.
H Install or Connect (Figures 23 and 24)
1. Seal halves to the block (figure 24).
• Apply a light coating of engine oil to the seal lips
where they contact the crankshaft.
• "Roll" one seal half into the block seal groove
until 13 mm (1 /2-inch) of the seal's one end is
extending out of the block.
• Insert the other seal half into the opposite side
of the seal groove in the block.
INSTALLING THE LOWER SEAL HALF
Figure 24 — Installing the Two Piece Rear
Crankshaft Seal
] Important
• The contact ends of the seal halves should now
be at the four and ten o'clock positions, or at the
eight and two o'clock positions. This is neces­
sary to align the rear main bearing cap and seal
lips.
NOTICE: To prevent damage to the main bearing
caps, the caps are 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.
2. Main bearing cap to the block.
• Lightly coat the seal groove in the main bearing
cap with adhesive (GM part number 1052621
[Loctite 414] or equivalent).
• Apply a thin film of anaerobic sealant (GM part
number 1052756 or equivalent) to the main
bearing cap as shown in figure 23. Do not put
sealant in the oil relief slot.
L00983