MerCruiser 350 Magnum MPI, Operation & Maintenance Manual

Page: 59 / 76

57
Possible Cause Remedy Trouble
Excessive engine
temperature
(continued)
•
Heat exchanger cores plugged
with foreign material
•
Loss of pressure in fresh water
section
•
Faulty thermostat
•
Insufficient oil in crank-
case
•
Clean.
•
Check for leaks. Clean, test and inspect pres-
sure cap.
•
Replace.
•
Check and add correct grade and viscosity oil.
Check entire engine for leaks. Low engine oil
pressure
•
Excessive oil in crankcase
(causing it to become aerated)
•
Diluted or improper viscosity oil
•
Engine oil cooler hose kinked
(causing excessive oil temper-
ature and thinning of the oil)
•
Low fluid level
•
Transmission shift lever not posi-
tioned properly (causing clutches
to slip and overheat fluid)
•
Fluid cooler hoses kinked
•
Excessive current draw from bat-
tery
•
Check and remove required amount of oil.
Check for cause of excessive oil (improper
filling, bad fuel pump, etc.).
•
Change oil and oil filter, being sure to use
correct grade and viscosity oil. Determine
cause for dilution (excessive idling, faulty
fuel pump, etc.).
•
Straighten hose or replace if damaged.
•
Maintain fluid level.
•
Inspect shift linkages and shift lever
positioning
•
Straighten hoses or replace, if damaged.
•
Turn off non-essential accessories.
Excessive trans-
mission fluid
temperature or
slipping trans-
mission
•
Loose or dirty electrical connec-
tions or damaged wiring
•
Check all associated electrical connections
and wires (especially battery cables). Clean
and tighten faulty connections. Repair or re-
place damaged wiring.
•
Alternator drive belt loose or in
poor condition
•
Unacceptable battery condition
•
Insufficient lubrication on shift and
throttle linkages
•
Loose or missing shift and
throttle linkage fasteners
•
Obstruction in shift or throttle
linkages
•
Replace and/or adjust.
•
Test battery.
•
Lubricate.
•
Check all linkages. If any are loose or missing,
SEE YOUR DEALER IMMEDIATELY.
•
Remove obstruction.
•
Shift or throttle cable kinked
•
Straighten cable or have your dealer replace
cable if damaged beyond repair.
Remote control
operates hard,
binds, has exces-
sive free-play or
makes unusual
sounds
Insufficient engine
temperature
Battery will not
come up on
charge
•
Coolant level low in fresh water
section
•
Check for cause of low coolant level and repair.
Fill system with proper coolant solution.