Mainship 40 Trawler Single Operator's Manual - page 125
Mainship 40 Trawler Single & Twin • Engines and Transmissions
11.9
Low oil pressure
Insufficient oil in crankcase
Check and add correct grade and
viscosity oil. Visually check engine
for leaks
Excess oil in crankcase
Check and remove required amount
of oil. Check for cause of excessive
oil (improper filling, bad fuel pump,
etc.).
Diluted or improper grade and vis-
cosity oil
Change oil and oil filter. Be sure to
use the correct grade and viscosity
oil
Oil leak in pressure line
Inspect all oil lines and tighten all
connections as necessary
No oil pressure
Defective gauge, gauge tube, or oil
line
Replace gauge or gauge sender
No oil in engine
Refill crankcase. See engine manu-
al for proper grade and viscosity
High oil pressure
Too heavy grade of oil
Drain oil and replace. See engine
manual for proper grade
Dirt or obstruction in oil line
Drain and clear oil system.
Check for bent or flattened oil lines
and replace as necessary
Sludge in oil
Infrequent oil changes
Drain oil and refill with oil of proper
grade and viscosity
Dirty oil filter
Replace filter
Water in oil
Drain oil and refill. See your dealer
if problem persists
Transmission shifts hard
Corroded or pinched linkage
Lubricate or replace linkage as
needed