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

6A3-12 4.3 LITER V
Figure 16— Replacing the Crankshaft Sprocket
0
Install or C o n n ect (F ig u re 16)
Tool Required:
J 5590, Crankshaft Sprocket Installer
1. Key (if removed).
2. Crankshaft sprocket using J 5590.

FRONT COVER

C lean
r ? f
Old gasket from the gasket surfaces.
Inspect
Front cover for damage, dents, or cracks.
R em o ve or D isco n n ect
Oil seal from the front cover.
— Pry the seal out with a large screw driver.
— Be careful not to distort the front cover.
-6
B-09549
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.
jjjl
WATER PUMP
Clean
Old gasket from the gasket surface.
Im p o rtan t
• Do not immerse the pum p in solvent. The
solvent may enter the pum p's perm anently
lubricated bearings, dissolve the bearings;
lubricant supply, and cause prem ature 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 pum p shaft
seal is leaking and the w ater pum p should be
replaced.
OIL PAN AND ROCKER ARM
COVERS
imp
Clean
Parts in solvent. Remove all sludge and varnish.
Old gaskets from the gasket surfaces.
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 dam age or cracks.
Oil pan baffle for lack of fit.
Drain plug threads for stripping.
OIL PUMP
R em o ve or D isco n n ect (F ig u re 17)
1. Pump cover attaching bolts (9) and the pum p cover
(5).
• Mark the teeth so the pum p gears can be installed
with the same gear teeth indexed.
2. Idler gear (4), drive gear (3), and shaft and retainer
(1) from the pump body.
3. Pressure relief valve retaining pin (8).
4. Spring (7) and pressure relief valve (6).
5. Pickup screen and pipe.
• Do not remove the pickup screen and pipe
unless replacem ent is required.