SERVICE MANUAL
WATER PUMP, THERMOSTAT & IDLER PULLEYS
Section 9
SPECIFICATIONS:
DIMENSION
VALUE
Water Pump
Impeller Vane Height to Mounting ..............................................................................................................0.25 mm 0.010 in.
Face of Housing (7 Vane ) ..............................................................................................................0.25 mm 0.02210 in.
Clearance Between Housing and Back Face of Impeller (4 Vane & 8 Vane)
Light Duty ....................................................................................................................................................0.25 mm 0.010 in
(with Pressed-On Hub) ..................................................................................................................... 1.17 mm 0.046 in.*
Heavy Duty ...................................................................................................................................................0.25mm 0.010 in.
with Nut Retained Hub) (4 & 8 Vane) ........................................................................................................ 1.17mm 0.046 in.*
Heavy Duty
(with Nut Retained Hub) (7 Vane)........................................................................................................0.31 mm 0.012 in.
........................................................................................................................................................... 1.63 mm 0.064 in.*
Bearing End Play.....................................................................................................................................0.038 mm 0.0015 in.
(Roller Bearing Only) .......................................................................................................................0.241 mm 0.0095 in.
*All dimension with end play of shaft to rear.
WATER PUMP INSPECTION
It is recommended that water pump assemblies be
inspected at every oil change interval for coolant leakage
and bearing end play. The water pump should be
removed, disassembled and inspected every 120,000 mi.
(193, 121 Km.), 4000 hours or 27 months, whichever
occurs first.
Water Pump Inspection at Oil Change Interval 6000
Mile (9600 KM.), 200 Hours or 3 Months
Coolant Leakage
Each water pump housing features an inspection port (9,
Fig. 8) which allows operators and maintenance
personnel to determine if the water pump seal is leaking
coolant. Ex- amine the inspection port for the presence
of coolant or blockage by grease or dust. If coolant or
excessive grease is present at the inspection port,
remove the pump (refer to "Removal" this section) and
install a new, ReNEWed or locally rebuilt assembly.
Remove any inspection port blockage with a wire or rod.
IMPORTANT: I F BLOCKAGE IS NOT REMOVED, and
the water pump seal leaks, coolant will enter the
bearings and damage the bearings and shaft.
Bearing End Play
Verify end play by grasping the water pump pulley hub
(7, Fig. 8) and moving the pulley fore and aft. Specified
end play is 0.038 to 0.241 mm (0.0015 to 0.0095 in.). If
the end play appears to be excessive completely loosen
all belts and measure end play using a dial indicator.
Replace the assembly if 0.241 mm (0.0095 in.) is
exceeded.
120,000 Mile (193, 121 Km), 4000 Hour or 27 Month
Inspection
CGES-185-3
PRINTED IN UNITED STATES OF AMERICA
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