Crankshaft Removal; Main Bearing Removal (Without Removing Crankshaft) - GMC 1989 Light Duty Truck Repair Manual

Figure 15— Replacing the Piston and Connecting
Rod (Typical)
FLYWHEEL REMOVAL
R em ove or D isconnect
1. Bolts.
2. Retainer (automatic transmisison only).
3. Flywheel.

CRANKSHAFT REMOVAL

0
Rem ove or D isconnect (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.
2.8 LITER V-6 6A2-11
A. F ro n t
85. B o lt
86. M ain B e aring Cap
87. B earing In s e rt
88. O il Seal
Figure 16— Crankshaft Installation
MAIN BEARING REMOVAL
(WITHOUT REMOVING
CRANKSHAFT)
Rem ove or D isconnect
□
Tool Required:
J 8080, Main Bearing Remover/Installer
1. Main bearing caps.
• Check the main bearing caps for location
markings. Mark the caps if necessary. The
caps m ust be retu rn e d to th e ir o rig in a l
locations during assembly.
2. Lower main bearing inserts from the main bearing
caps.
3. Upper main bearing inserts.
• Insert J 8080 into the crankshaft oil hole
(figure 17).
• Rotate the crankshaft to turn the bearing insert
out of the block.
B-09405