MerCruiser 350 MAG MPI Horizon User Manual

Section 7 - Troubleshooting
Page 136 90-864195070 JUNE 2007
Insufficient Engine Temperature
Possible Cause Remedy
Faulty thermostat. Replace.
Low Engine Oil Pressure
Possible Cause Remedy
Insufficient oil in crankcase. Check and add oil.
Excessive oil in crankcase (causing it to become
aerated).
Check and remove required amount of oil. Check for
cause of excessive oil (improper filling).
Diluted or improper viscosity oil.
Change oil and oil filter, using correct grade and
viscosity oil. Determine cause for dilution (excessive
idling).
Battery Will Not Come Up On Charge
Possible Cause Remedy
Excessive current draw from battery. Turn off non‑essential accessories.
Alternator drive belt loose or in poor condition. Replace and/or adjust.
Unacceptable battery condition. Test battery, replace if necessary.
Loose or dirty electrical connections or damaged
wiring.
Check all associated electrical connections and wires
(especially battery cables). Clean and tighten faulty
connections. Repair or replace damaged wiring.
Faulty alternator Test alternator output, replace if necessary.
Remote Control Operates Hard, Binds, Has Excessive Free‑play Or
Makes Unusual Sounds
Possible Cause Remedy
Insufficient lubrication on shift and throttle linkage
fasteners.
Lubricate.
Obstruction in shift or throttle linkages. Remove obstruction.
Loose or missing shift and throttle linkages.
Check all throttle linkages. If any are loose or missing,
see authorized Mercury MerCruiser dealer
immediately.
Shift or throttle cable kinked.
Straighten cable or have authorized Mercury
MerCruiser dealer replace cable if damaged beyond
repair.
Steering Wheel Turns Hard Or Jerky
Possible Cause Remedy
Low power steering pump fluid level. Check for leak. Refill system with fluid.
Drive belt loose or in poor condition. Replace and/or adjust.
Insufficient lubrication on steering components. Lubricate.
Loose or missing steering fasteners or parts.
Check all parts and fasteners if any are loose or missing,
see authorized Mercury MerCruiser dealer immediately.
Contaminated power steering fluid. See authorized Mercury MerCruiser dealer.

MerCruiser 350 MAG MPI Horizon Specifications

General

Brand	MerCruiser
Model	350 MAG MPI Horizon
Category	Engine
Language	English