Oil Pump Removal; Front Cover Removal; Camshaft Removal; Balance Shaft Removal - GMC T Series 1994 Repair Manual

OIL PUMP REMOVAL

Remove or Disconnect
1. Oil pump to main bearing cap bolt.
2. Complete oil pump assembly.
3. Shaft extension.

FRONT COVER REMOVAL

Remove or Disconnect
1. Front cover bolts.
2. Front cover.
3. Front cover gasket.

CAMSHAFT REMOVAL

► Remove or Disconnect (Figures 15 through 17)
Tools Required:
J 5825-A Crankshaft Gear Puller
1. Camshaft sprocket bolts and nut. (nut, C/K and S/T
vehicles).
2. Camshaft sprocket and timing chain.
• The sprocket has a light interference fit on the
camshaft. Tap the sprocket on its lower edge to
loosen it.
3. Crankshaft sprocket, if necessary. Use J 5825 (fig­
ure 17).
4. Screws (88) and thrust plate (87).
19. BOLT
20. GUIDE ASSEMBLY
21. NUT
22. BALL
23. ARMS, ROCKER
24. PUSHROD
26. LIFTER, HYDRAULIC
5. Camshaft.
A. Install three 5/16-18-inch bolts 100-125 mm
(4-5 inches) long into the camshaft's threaded
holes. Use these bolts to handle the camshaft
(figure 16).
B. Use care to prevent damage to the camshaft
bearings.
C. Pull the camshaft out from the block.

BALANCE SHAFT REMOVAL

For 4.3L engines with a balance shaft, refer to the
" Balance Shaft Removal" procedure in SECTION 6A4.
PISTON AND CONNECTING ROD
REMOVAL
4-4 Remove or Disconnect (Figures 18 and 19)
Tools Required:
J 5239 Guide Set
J 24270 Ridge Reamer
1. Ridge or deposits from the upper end of the cylin­
der bores as follows:
A. Rotate the crankshaft until the piston is at BDC.
B. Place a cloth on top of the piston.
C. Perform the cutting operation with J 24270.
D. Rotate the crankshaft until the piston is at TDC.
E. Remove the cloth and cuttings.
F. Repeat this procedure for each piston.
2. Mark the cylinder numbers on the tops of each
piston.
3706r4876