Insufficient Water Flow From Belt Driven Seawater Pickup Pump - Mercury MerCruiser MCM 454 Mag MPI Service Manual

TROUBLESHOOTING

Insufficient Water Flow from Belt Driven Seawater Pickup Pump

Drive belt
Seawater shutoff valve partially or fully
closed
Clogged or improperly installed sea
strainer
Loose hose connections between seawa-
ter pickup and seawater pump inlet
Seawater inlet hose kinked or plugged
Seawater pickup plugged
Obstruction on boat bottom causing water
turbulence.
Faulty seawater pump
Index Index
Page 1C-26
Downloaded from https://needmanual.com/
Cause
SERVICE MANUAL NUMBER 23
Special Information
Loose, worn or broken
Pump will suck air, pump may fail to prime
or will force air bubbles into cooling
system
Obstruction will be in front of seawater
pickup, causing air bubbles to be forced
into cooling system
90-861326--1 MARCH 1999