
47
1
2
3
4
5
6
7
8
9
10
11
12
13
TROUBLESHOOTING
Engine f
alling to star
t
Engine star
ting b
ut stopping soon
P
oor idling
P
oor acceler
ation
Engine speed abnor
mally high
Engine speed abnor
mally lo
w
Boat speed lo
w
Ov
erheating of engine
W
ar
ning lamp ON
Possible cause
COMPRESSION
& OIL SYSTEM
●
●
●
●
●
Low compression
●
●
Carbon deposits in the combustion chamber
●
●
Incorrect valve clearance
●
Low oil pressure/level
ENGINE OIL SYSTEM
●
●
●
Low oil level
●
●
Use of improper oil
●
●
●
Oil deterioration
●
●
●
Clogged oil strainer
●
●
●
Faulty oil pump
O
THERS
●
●
●
●
●
Incorrect adjustment of throttle link
●
●
Insufficient cooling water flow, clogged or defective pump
●
●
●
Faulty thermostat
●
●
●
●
Cavitation or ventilation
●
●
●
●
●
Incorrect propeller selection
●
●
●
●
●
●
Damaged or bent propeller
●
●
●
●
Improper thrust rod position
●
●
●
●
●
Unbalanced load on boat
●
●
●
●
●
Transom too high or too low
TOHATSU_4C-5C-6C_E_body_110214.indd 47
11/02/21 18:34