Flywheel Removal; Crankshaft Removal; Main Bearing Removal (Without Removing Crankshaft) - GMC 1990 Light Truck Repair Manual

A. Thread Protector
Figure 15—Replacing the Piston and Connecting
Rod (Typical)

FLYWHEEL REMOVAL

|*"»| Remove or Disconnect
1. Bolts.
2. Retainer (automatic transmisison only).
3. Flywheel.

CRANKSHAFT REMOVAL

+ + Remove or Disconnect (Figure 16)
• Check the main bearing clearance before removing
the crankshaft. Refer to " Crankshaft and Main
Bearing Installation" later in this section.
• The main bearings and rear oil seal can be replaced
without removing the crankshaft as outlined later in
this section.
1. Bolts (85).
2. Main bearing caps (86).
3. Crankshaft from the cylinder block.
• Lift the crankshaft straight up, taking care to
avoid damage to the crankshaft journals and
thrust flange surfaces.
B-09433
A. Front
85. Bolt
86. Main Bearing Cap
87. Bearing Insert
88. Oil Seal
Figure 16—Crankshaft Installation
MAIN BEARING REMOVAL
(WITHOUT REMOVING
Remove or Disconnect
Tool Required:
J 8080, Main Bearing Remover/Installer
1. Main bearing caps.
• Check the main bearing caps for location
2. Lower main bearing inserts from the main bearing
caps.
3. Upper main bearing inserts.
• Insert J 8080 into the crankshaft oil hole
• Rotate the crankshaft to turn the bearing insert
2.8 LITER V
CRANKSHAFT)
markings. Mark the caps if necessary. The
caps must be returned to their original
locations during assembly.
(figure 17).
out of the block.
6A2-11
-6
B-09405