Hunter H39, Operator'S Manual

Page: 163 / 216

Engines and Transmissions
11.7
Drop in oil pressure
(engine running at constant speed)
Lubrication system leaking
Defective oil pump
Pinched oil lines to remote filters
Repair if possible. See your dealer
for service
See your dealer for service
Reroute if possible. See your dealer
for service
Excessive vibration Loose engine mounting bolts
Engine not timed properly or misfir-
ing
Engine-to-shaft couplings out-of-
round or off-center
Engine misaligned
Worn strut or transmission
Inspect and tighten as required
See your dealer for service
See your dealer for service
See your dealer for service
Replace bearings if needed. See
your dealer for service
Poor performance Boat overloaded
Weight poorly distributed
Excess bilge water
Damaged or incorrect propeller
Fouled or damaged hull bottom
Engine misaligned
Reduce load
Distribute weight evenly. Trimming
may help
Pump out water. Check for leaks
Inspect propeller. Replace if neces-
sary
Inspect, clean, or repair
See your dealer
Low cranking speed Loose or dirty electrical connections
Low battery charge
Defective battery
Engine oil too heavy for prevailing
temperatures
Check all related electrical connec-
tions and wires
Charge battery
Replace battery
Drain oil and refill with correct grade
viscosity oil. See engine manual for
correct grade and viscosity
Poor acceleration Throttle not full open
Engine overheating
Inspect cables and linkage for bind-
ing, obstructions, and loose fasten-
ers
See solutions under “Engine
Overheating” problem
Excessive fuel consumption Restriction in air filter Remove filter and clean or replace
Low oil pressure Insufficient oil in crankcase
Excess oil in crankcase
Diluted or improper grade and vis-
cosity oil
Oil leak in pressure line
Check and add correct grade and
viscosity oil. Visually check engine
for leaks
Check and remove required amount
of oil. Check for cause of excessive
oil (improper filling, bad fuel pump,
etc.).
Change oil and oil filter. Be sure to
use the correct grade and viscosity
oil
Inspect all oil lines and tighten all
connections as necessary
No oil pressure Defective gauge, gauge tube, or oil
line
No oil in engine
Replace gauge or gauge sender
Refill crankcase. See engine manu-
al for proper grade and viscosity