Camshaft Bearings; Timing Gear Cover - GMC 1989 Light Duty Truck Repair Manual

• Place the camshaft (182) in a press. Support
the camshaft gear. DO NOT support the thrust
plate (95).
NOTICE: The thrust p la te m ust be p o sitio n e d so
that the key (9 6 ) does n o t dam age it during the
rem oval operation.
• Press the camshaft out of the camshaft gear.
2. Thrust plate.
3. Spacer (97).
*
Assem ble (Figures 5 and 30)
Tool Required:
J-22912-01 Support Plate (or equivalent)
• Support the camshaft (182) at the front journal with
tool J-22912-01 (or equivalent) (figure 30). Mount the
camshaft in a press as shown.
• Lubricate the thrust plate (95) with engine oil.
1. Key (96) (if removed).
2. Spacer (97). Make sure the chamfer in the spacer
faces towards the journal radius.
3. Thrust plate.
4. Camshaft gear (94).
• MAKE SURE THAT THE TIMING MARK IS TO
THE OUTSIDE.
• Press the camshaft gear onto the camshaft
until it bottoms on the spacer (figure 30).
• Remove the camshaft from the press.
M easure (Figure 28)
Camshaft to thrust plate clearance. Use a feeler
g a g e (fig u re 2 8). T h e c o rre c t c le a ra n c e is
0.003-0.008-inch.

CAMSHAFT BEARINGS

Refer to GENERAL ENGINE MECHANICAL (SEC.

TIMING GEAR COVER

I j j j l
Clean
Old gasket from the gasket surfaces.
Lv
Inspect
Timing tab for damage.
Timing gear cover for cracks, large dents, etc.
*
D isassem ble (Figure 5)
Seal (158). Pry the seal out with a screwdriver.
*
A ssem ble (Figure 31)
Tool Required:
J-35468 Seal Installer
Seal (158). Use J-35468.
• Support the inside of the front cover around
the seal bore area.
• Press the seal into place. The open end of the
seal faces inside the front cover.
• Lubricate the seal lips with grease.
Clean
Old gasket from the gasket surface.
Im portant
• Do not immerse the pump in solvent. The
solvent may enter the pum p's permanently
lubricated bearings, dissolve the bearings'
lubricant supply, and cause premature bearing
failure.
Inspect
13
— Water pump shaft for roughness and end play. If the
shaft does not turn smoothly, or if there is excessive
end play, replace the water pump.
— Water pump body at the drain hole. If there is
evidence of coolant leakage, the water pump shaft
seal is leaking, and the water pump should be
6 A).
replaced.
4.8 LITER L6 6A4-17
WATER PUMP