Excessive Engine Temperature; Insufficient Engine Temperature - Mercury 1.7 MI Manual

SECTION 7
CE537

Excessive Engine Temperature

Water inlet or seacock closed.
Seawater inlet hose kinked (restricted)
Use of improperly designed hose on inlet
side of seawater pump allowing it to
collapse.
Drive belt loose or in poor condition.
Seawater pickups or sea strainer
obstructed.
Seawater discharge restricted or plugged.
Coolant level low in closed cooling
section.
Heat exchanger cores plugged with
foreign material
Loss of pressure in closed cooling section.
Faulty thermostat.
Faulty seawater pickup pump.
Faulty engine water circulating pump.
CE538

Insufficient Engine Temperature

Faulty thermostat.
CMD-3967823 / 90-865237030 OCTOBER 2003
INDEX
Possible Cause
Possible Cause
Remedy
Open.
Position hose to prevent kinking
(restriction).
Replace hose with wire reinforced design.
Replace or adjust belt.
Remove obstruction.
Have inspected by an authorized
Cummins MerCruiser Diesel dealer /
distributor.
Check for cause of low coolant level and
repair. Fill system with proper coolant
solution.
Have inspected by an authorized
Cummins MerCruiser Diesel dealer /
distributor.
Check for leaks. Clean, inspect and test
pressure cap.
Have inspected by an authorized Have inspected by an authorized
Cummins MerCruiser Diesel dealer /
distributor. di t ib t
Remedy
Have inspected by an authorized
Cummins MerCruiser Diesel dealer /
distributor.
TROUBLESHOOTING
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