GMC 1989 Light Duty Truck Repair Manual page 478

6A4-24 4.8 LITER L6
A. Forward
B > Fabricated Tool
C. Oil Seal Lip
115. Block
132. Upper Seal Half
135. Lower Seal Half
137. Rear Main Bearing Cap
154. Crankshaft
Figure 47—Crankshaft Rear Oil Seal Installation
exercised when installing this seal to protect the sealing
bead located in the channel on the outside diameter of
the seal.
WITH CRANKSHAFT INSTALLED
Install or C onnect (Figures 5, 47, and 48)
+ +
1. Upper seal half (132).
• Coat the seal lips lightly with engine oil. Keep
the oil off of the seal mating ends.
• P osition the tip of the tool betw een the
crankshaft (154) and the seal seat in the block
(115) (figure 47).
• Position the seal half between the crankshaft
and tip of the tool. Make sure that the oil seal
lip is positioned toward the front of the engine
(figure 47).
• Roll the seal around the crankshaft using the
tool as a " shoe-horn" to protect the seal bead
from the sharp corner of the seal seat surface
Figure 48—Crankshaft Rear Oil Seal Half
• Remove the tool, being careful not to withdraw
2. Lower seal half (135).
• Coat the seal lips lightly with engine oil. Keep
• Insert the seal half into the rear main bearing
3. Rear main bearing cap (135) as outlined later.
WITH CRANKSHAFT REMOVED
Install or C onnect (Figures 5 and 48)
1. Upper seal half (132).
B-05251
• Insert the seal half in the block (115), using the
• Feed the seal into position gradually, using the
• Remove the tool, being careful not to withdraw
2. Lower seal half (135).
• Insert the seal half into the rear main bearing
• Make sure the oil seal lip faces the front of the
• Coat the seal lips lightly with engine oil. Keep
in the block. The installation tool must remain
in position until the seal half is properly
positioned with both ends flush with the block.
the seal half.
the oil off of the seal mating ends.
cap (135). Use the tool to protect the seal half
from the sharp edge of the seal seat. Feed the
seal half into the rear main bearing cap, using
light finger pressure. Make sure the oil seal lip
faces the front of the engine (figure 48).
installation tool to protect the back sealing
bead of the seal from the sharp corner of the
block. Position the seal and the tip of the tool
so that the seal contacts the tool. Make sure
that the oil seal lip is positioned toward the
front of the engine (figure 79).
tool as a " shoe-horn" to protect the seal outer
diameter from damage. The tool must remain
in position until the seal is properly in position,
with both ends flush with the block.
the seal.
cap (135). Use the tool to protect the seal half
from the sharp edge of the seal seat. Feed the
seal half into the rear main bearing cap, using
light finger pressure.
engine (figure 48).
the oil off of the oil seal mating ends.