Water Circulating Pump; Removal; Cleaning And Inspection; Installation - Mercury MerCruiser MCM 454 Mag MPI Service Manual

SERVICE MANUAL NUMBER 23

Water Circulating Pump

Removal

1. Drain water from cylinder block.
2. Break loose circulating pump pulley attaching bolts. Do not remove bolts at this time.
3. Loosen alternator tensioner pulley, then pivot alternator inward and remove the serpen-
4. Remove pump pulley attaching bolts, lockwashers, clamping ring (if equipped) and
5. Disconnect hose(s) from pump.
6. Remove bolts, which secure pump to cylinder block, and remove pump and old gaskets

Cleaning and Inspection

1. Clean gasket surfaces on water pump and cylinder block.
2. Inspect water pump for blockage, cracks, sand holes, corrosion or other damage.
3. Check impeller shaft and bearings for excessive side play. If play can be felt, replace
4. Inspect pump pulley for bends, cracks, corrosion or other physical damage. Inspect

Installation

1. Coat both sides of new circulating pump gasket with Quicksilver Perfect Seal, then posi-
2. Reconnect hoses to pump.
3. Install pump pulley and clamping ring (if used) on pump hub and secure with bolts and
4. Install drive belts and adjust tension as outlined in "Drive Belt Tension Adjustment," fol-
5. Start engine and check for leaks.
Index
90-861326--1 MARCH 1999
Downloaded from https://needmanual.com/
tine drive belt.
pulley.
(discard gaskets).
Inspect pump impeller for cracks and erosion. Replace complete pump if any damage
exists.
complete pump.
pulley for rotational trueness. Replace pulley if damaged or untrue.
tion gaskets and circulating pump on cylinder block. Coat threads of circulating pump
attaching bolts with Quicksilver Perfect Seal and install bolts and alternator brace (if
applicable). Torque bolts to specifications.
lockwashers. Tighten bolts securely.
lowing.
SEAWATER COOLED MODELS
Page 6A-19