Coolant Pump - Chevrolet 1991 Light Duty Truck Repair Manual

6A3-12 4 .3LV 6 ENGINE
TIMING CHAIN AND SPROCKETS
® Inspect
• Sprockets for chipped teeth and wear.
• Timing chain for damage.
• Excessively worn sprockets will rapidly wear a new
chain.
• An excessively worn chain will rapidly wear a new
set of sprockets.
CRANKSHAFT SPROCKET REPLACEMENT
|<"»| Remove or Disconnect (Figure 18)
Tool Required:
J 5825-A Crankshaft Sprocket Puller
1. Crankshaft sprocket using J 5825-A.
2. Key (if necessary).
□ Install or Connect (Figure 18)
Tool Required:
J 5590 Crankshaft Sprocket Installer
1. Key (if removed).
2. Crankshaft sprocket using J 5590.
FRONT COVER
Clean
• Old gasket from the gasket surfaces.
Inspect
E
Front cover for damage, dents or cracks.
E
Remove or Disconnect
Oil seal from the front cover.
— Pry the seal out with a large screwdriver.
— Be careful not to distort the front cover.
Install or Connect
□
Tool Required:
J 35468 Seal Installer
• New seal so that the open end of the seal is
toward the inside of the cover.
— Support the cover at the seal area.
— Drive the seal into position with J 35468.
• Lubricate the seal with engine oil before installing
the torsional damper.

COOLANT PUMP

g Clean
• Old gasket from the gasket surface.
Notice: Do not immerse the pump in solvent.
The solvent may enter the pump's perma­
nently lubricated bearings and cause prema­
ture bearing failure.
Figure 18— Replacing the Crankshaft Sprocket
Inspect
L *
Coolant pump shaft for roughness and end play. If
the shaft does not turn sm oothly or if there is
excessive end play, replace the coolant pump.
Coolant pump body at the weep hole. If there is
evidence of coolant leakage, the coolant pump
shaft seal is leaking and the coolant pump should
be replaced.
OIL PAN AND ROCKER ARM
COVERS
IJJI Clean
Parts in solvent. Remove all sludge and varnish.
Old gaskets from the gasket surfaces.
I*
Inspect
Gasket flanges for bending or damage.
Rubber grom mets and parts on the rocker arm
cover for deterioration.
B9549