Mechanical - Mercury MerCruiser D2.8L D-Tronic Service Manual

TROUBLESHOOTING
Cooling System (continued)
13. Obstruction in cooling system such as
14. Engine water circulating pump
18. Heat exchanger core or tubes plugged
15. Also refer to Engine Overheats

Mechanical

1. Engine rpm below specifications at
wide-open-throttle (engine laboring)
2. Incorrect injection pump timing
3. Seawater pump impeller slipping
4. Exhaust restriction
5. Valve timing off
6. Insufficient lubrication to moving parts
of engine
Page 1C-30
Cause
casting
flash, sand, rust, salt, etc.
defective
(Mechanical)
Cause
SERVICE MANUAL NUMBER 22
Special Information
13. Refer to water flow diagram for engine
type being serviced
Special Information
1. Damaged or wrong propeller; growth
on boat bottom; false bottom full of
water
2. Injection pump timing too far advanced
or retarded
5. Jumped timing chain, or gears
improperly installed
6. Defective oil pump, plugged oil
passage, low oil level
90-860074--1 FEBRUARY 2002