Water P U M; Oil Pan And Rocker Arm Covers; Oil P U M - GMC 1989 Light Duty Truck Repair Manual

6A1-18 2.5 LITER L4 ENGINE
— Press the seal into place. The open end of the
seal faces inside the front cover.
Lubricate the seal lips with grease.
WATER PUMP
131
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
— 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
replaced.
OIL PAN AND ROCKER ARM
COVER
I 31
Clean
• Parts in solvent. Remove all sludge and varnish.
• Old RTV sealant from the sealing flange
I*
Inspect
Gasket flanges for bending or damage.
Oil pan for rock damage or cracks.
Drain plug threads for stripping.
77. P um p B o dy
79. S p rin g R e ta in in g
Pin
80. S p rin g
81. C over S cre w s
82. C over
83. C over G a sket
85. P ressure R e lie f Valve
127. Id le r G ear
128. D rive G ear and S h a ft I I
85
129. Pick-U p S creen
and Pipe
129
Figure 32— Oil Pump Components
OIL PUMP
❖
D isassem ble (Figure 32)
1. Cover screws (81).
2. Cover (82).
3. Gasket (83).
• Mark the gear teeth so the pump gears can be
installed with the same gear teeth indexed.
4. Drive gear and shaft (128).
5. Idler gear (127).
6. Spring retaining pin (79).
7. Spring (80).
8. Pressure relief valve (85).
9. Pickup screen and pipe (129).
• Do not remove the pickup screen and pipe
unless replacement is required.
• The pickup pipe is a press fit in the pump
body.
• Do not try to remove the screen from the pipe.
The pickup screen and pipe is serviced as an
assembly only.
131
Clean
All parts in clean so lv e n t and blow d ry w ith
compressed air.
Inspect
— Pump body (77) and cover (82) for cracks or other
damage.
— Gears (127 and 128) for wear.
12 7>
F -02000