Comanche 4WD L6-242 4.0L VIN L FI (1990)
Water Pump: Fundamentals and Basics
Installation Tips and Hints
WATER PUMP INSTALLATION NOTES
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Compare the old pump to the new pump and verify:
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Shaft lengths match exactly.
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Retaining bolt holes match exactly.
Fig. 10 Water Pump Remove/Install - 4.0L 6-Cylinder Engine
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Install the fan retaining studs into the shaft flange prior to installing the pump. The studs are much easier to install with the pump out of the vehicle
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Verify the retaining bolts and bolt holes have clean threads. Re-tap or chase the threads as necessary.
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Do not over tighten the retaining bolts, use a torque wrench to properly tighten the bolts to the correct specification.
CAUTION: Water pump retaining bolts may be easily broken or stripped, do not tighten the retaining bolts with an air wrench or impact gun.
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While working on the cooling system it is a good habit to clean the radiator and A/C condenser fins of bugs and dirt. This build up of debris can
seriously reduce the cooling ability of the system.