Installation Instructions for 51001-80

High-Flow Water Pumps

Read All of the Instructions Before Beginning the Installation.

To get the most out of your NEW Water Pump, follow these installation recommendations:

Note: Always refer to your vehicle manufacturers repair manual for the exact procedures and

specifications when replacing your water pump.

Before Installing New Water Pump:

1. IF THE OLD PUMP WILL STILL CIRCULATE COOLANT THROUGH THE ENGINE, CLEAN THE

COOLING SYSTEM WITH A CHEMICAL CLEANER AND REVERSE FLUSH ALL SEDIMENT,

RUST, AND SCALE BEFORE REMOVING OLD PUMP.

2. Drain coolant from radiator and engine block.

3. Disconnect and inspect all hoses from old water pump, and inspect and disconnect fan belts riding

on pulley connected to water pump. Remove fan, fan clutch (if equipped) and pulley from old water

pump. Inspect and replace if necessary.

4. Inspect fan tensioner if equipped, and replace if necessary.

5. Remove old water pump from engine making note of location of any special bolt(s) or fastener(s).

6. Clean out any built up sediment and scale from impeller cavity in engine block.

7. Remove all gasket material from pump mounting surfaces on engine.

Installing New Water Pump:

1. If water pump is equipped with a steel back plate covering the impeller, check all mounting bolts and

tighten as required.

2. Coat both sides of new gasket with tacky sealer and position on new water pump or engine.

NOTE: If using a self curing, silicone type gasket sealer from a tube, do not apply excessive amount.

Excess will be squeezed out into water pump and can plug up cooling passages.

3. Install new water pump on engine block - DO NOT FORCE PUMP ON BY STRIKING END OF

SHAFT.

4. Tighten mounting bolts gradually and evenly in a staggered sequence to vehicle manufacturer's

torque specifications.

5. Turn pump shaft by hand to make sure it rotates freely.

6. Reinstall pulley, fan clutch (if equipped), fan, fan belts, and reconnect all hoses (Be sure the belts

and pulleys are not off-set. If the pulley needs to be spaced forward, toward radiator, purchase

shim kit 720-6129). Tighten fan belts to factory recommended tension. Tension can be checked with

commercially available testers or by measuring fan belt deflection as specified in factory service

manual.

7. Fill radiator and coolant recovery bottle with a correct mixture of fresh low silicate coolant and

distilled water and check for leaks. Be sure to measure the amount of the coolant mixture that you

have added to the system and compare it to your capacity specifications in your vehicle's owners

manual, this will make you aware of any air that is trapped in the system.

8. Purge system of air as required.

9. Install radiator cap and run engine until normal operating temperature is reached, check for leaks

and water circulation.

NOTE A small, temporary seepage of coolant from the “weep hole” located on the lower side of the

shaft housing may occur during initial run-in period. This should stop after the seal has been allowed

to “lap in”.

10. After operating temperature has been reached, shut off engine and allow to cool - NEVER REMOVE

RADIATOR CAP WHILE ENGINE IS HOT.

11. Remove radiator cap (only after engine has cooled) and top off radiator and coolant recovery bottle

with additional low silicate coolant and distilled water mixture.

Prolong the life of your NEW Water Pump by taking the time to check the following:

FAN CLUTCH - (if equipped)- replace if: there is an indication of fluid at shaft seal. Housing is damaged

or broken. Noise or roughness can be detected when turning unit by hand, or when unit cannot

be turned by hand. Tip of fan blade can be moved more than 1/4 inch front to rear. If the fan clutch

bearing is worn out or if the fan clutch is damaged in any way, excessive loads produced by the

imbalance can result in early water pump bearing failure or even water pump shaft damage.

FAN - replace if: there are cracks, broken welds or loose rivets. Blades are bent or broken - NEVER

BEND OR ATTEMPT TO STRAIGHTEN FAN. Imbalance in a fan can produce the same excessive

loads as a damaged or worn fan clutch. Premature bearing failure or even water pump shaft damage

can occur.

FAN BELT TENSION - Never adjust belts tighter than specified in the factory service manual. Excess

tightening of belts running over the water pump pulley is the major cause of premature bearing

failure and breaking of the bearing shaft or housing. On models equipped with automatic belt

tensioners, be sure to inspect and test the operation of the tensioner prior to reusing. Most vehicle

manufactures have testing procedures and/or specifications for these tensioners.