Camshaft Removal - GMC 1989 Light Duty Truck Repair Manual

Figure 20— Removing the Upper Seal Half
Figure 2 1 — R em oving th e U pper Rear Main B earing Insert
• Use a small brass drift and hammer. Tap on
• Use a pair of pliers with the jaws taped to
4. Upper main bearing inserts (130).
• Insert J-8080 into the crankshaft (154) oil hole
• Rotate the crankshaft to " turn" the bearing

CAMSHAFT REMOVAL

Rem ove or D isconnect (Figures 5 and 23)
□
• Turn the camshaft (182) until the screws (93) are
visible through the holes in the cam shaft gear
(94) (figure 23).
1 . Screws (93).
2. Camshaft (182). Pull the camshaft out of the block.
Support the camshaft carefully when removing
to prevent damage to the camshaft bearings.
B-03487
4.8 LITER L6 6A4-13
the insert, on the side opposite the bearing
tang, until the insert rotates out of position
(figure 21 ).
prevent damage to the crankshaft. Clamp the
insert to the crankshaft flange (figure
Rotate the crankshaft (154) to remove the
bearing insert.
22
(figure ).
insert out of the block.
21 ).