Chevrolet 1988 Light Duty Truck Repair Manual page 370

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
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Old gasket from the gasket surface.
Im p o rtan t
Do not immerse the pump in solvent. The
solvent may enter the pum p's perm anently
lubricated bearings, dissolve the b e a rin g s'
lubricant supply, and cause prem ature bearing
failure.
I ? In sp ect
— 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 pum p shaft
seal is leaking, and the water pump should be
replaced.
OIL PAN AND ROCKER ARM
COVER
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• Parts in solvent. Remove all sludge and varnish.
• Old RTV sealant from the sealing flange.
In sp ect
• Gasket flanges for bending or damage.
• Oil pan for rock damage or cracks.
• Drain plug threads for stripping.
77. P u m p B o d y
S p rin g R e ta in in g
79.
Pin
80. S p rin g
7 9
C o ve r S c re w s
81.
C o ve r
82.
83. C o ve r G a s k e t
85. P re ssu re R e lie f Valve
127. Id le r G e a r
D rive G e a r and S h a ft f l
128.
85
129. P ick-U p S cre e n
and P ipe
80 85
(p M fflE E g f
79
129
Figure 32— Oil Pump Com ponents
OIL PUMP
❖
D isassem b le (F ig u re 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 replacem ent 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
assem bly only.
| j j |
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A ll p a rts in c le a n s o lv e n t and blow d ry w ith
compressed air.
— Pump body (77) and cover (82) for cracks or other
damage.
— Gears (127 and 128) for wear.
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a 80
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127
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