W Ater P U M; Oil Pan And Rocker Arm Covers; Oil Pump - Chevrolet 1988 Light Duty Truck Repair Manual

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Install or C on n ect
Tool Required:
J 35468, Seal Installer
New seal so that the open end of the seal is toward
the inside of the cover.
— Drive the seal into position with J 35468.
— Support the cover at the seal area.
Lubricate the seal with engine oil before installing
the torsional damper.
WATER PUMP
|m j|
C lean
Old gasket from the gasket surface.
Im po rtant
• Do not immerse the pum p 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
W ater 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 pum p should be
replaced.
OIL PAN AND ROCKER ARM
COVERS
C lean
Parts in solvent. Remove all sludge and varnish.
Old gaskets from the gasket surfaces.
L 9
In sp ect
Gasket flanges for bending or damage.
Rubber grom mets and parts on the rocker arm cover
for deterioration.
Oil pan for rock damage or cracks.
Oil pan baffle for lack of fit.
Drain plug threads for stripping.

OIL PUMP

R em o ve or D isco nn ect (F ig u re 21)
1. Pump cover attaching bolts (186) and the pump
cover (182).
• Mark the gear teeth so the pum p gears can be
installed with the same gear teeth indexed.
2. Idler gear (188), drive gear (181) and shaft (103) from
the pum p body.
3. Pressure relief valve retaining pin (185).
4. Pressure relief valve spring (184).
5. Pressure relief valve (183).
2.8 LITER V
103
103. Oil Pump Drive Shaft
180. Body
181. Drive Gear and Shaft
182. Cover
183. Pressure R elief Valve
184. Spring
185. Spring R etaining Pin
Figure 21 — Oil Pump Com ponents (Typical)
Pick-up screen and pipe (187).
• Do not remove the pick-up screen and pipe
unless replacem ent is required.
• The pick-up pipe is a press fit in the pum p
body (180).
• Do not try to remove the screen from the pipe.
The pick-up screen and pipe is serviced as an
Ijji
assem bly only.
Clean
A ll p a rts in c le a n s o lv e n t and b lo w d ry w ith
compressed air.
In sp ect (F ig u re 21)
Pump body (180) and cover (182) for cracks or other
damage.
Gears (181 and 188) for wear.
Drive gear and shaft (181) for lack of fit in the pum p
body (180).
Inside of the cover (182) for wear that would perm it
oil to leak past the ends of the gears. The pum p
gears, cover, and body are not serviced separately.
If the parts are dam aged or worn, replace the entire
oil pump assembly.
Pick-up screen and pipe (187) for dam age to the
screen, pipe or relief grommet.
Pressure relief valve (183) for fit. The regulator valve
should slide freely in its bore w ithout sticking or
binding.
"►* Install or C o n n e c t (F ig u re 21)
Tool Required:
J 21882, Pick-Up Tube and Screen Installer
1. Pressure regulator valve.
2. Spring.
3. Spring retaining pin.
4. Drive gear and shaft.
5. Idler gear.
• Index the marks made during disassembly.
Cover and screws.
6A2-15
-6
186. Cover Screws
187. Pick-up Screen
and Pipe
188. Idler Gear
B-09404