Yanmar YM155d Service Manual page 148

Does not warm up
sufficiently.
r-
1. Faulty water temp. switch.
I
Replace water temp. switch,
6.
Trouble
Lube oil pressure
indicator light does
not go
out
3.
Lube oil pressure:
Faulty lube oil pump. Replace.
Probable cause
1. Insufficient coolant.
2. Faulty water temp. switch.
3.
Insufficient lube oil.
4.
2.
Extremely low ambienitemperature.
1. Insufficient lube oil.
2. Poor lube oil:
Viscosity is too high.
Lube oil i s soiled.
I I
(
Lube oil filter clogged up.
I
Clean or replace.
Remedy
Check radiator and hoses for leaks,;
replenish coolant, clean radiator.
Replace water temp. switch.
Reolenish lube oil.
Overheats.
Fit protector to radiator.
Replenish lube oil.
Replace.
Replace.
I
Faulty lube oil pressure control.
valve.
1
Faulty lube oil pressure switch.
Check control pressure.
Check lube oil pressure switch or replace.
P ,
I I
fumes poor.
2. Overheating.
/
Reduce load.
Fault in electrical system.
1. Lube oil viscosity is too iow.
2. Oil leak.
3. Overheating.
4. Excessive wear of rings, pistons, o r
7.' High lube oil con-
sumption
1
3. Improper injection timing.
3. Faulty nozzle. Lap or replace
4. Excessive lube oil level.
Check electrical wiring.
Replace lube oil.
'
Replace.
liners
1. lnsuff~c~ent fuel
011.
2. Faulty fuel pump nozzle.
8.
Readjust injection timing.
1
5. Engine running too cold:
1 Excessive wear of rings, pistons or
Replace fuel oil.
Replace.
High fuel oil con-
sumption
9.1 Color of exhaust
/
1. Improper injection.
/
Readjust injection timing.
1
Faulty gauge unit.
Faulty gear unit.
Strange noises.
Faulty tachometer
(except YM135)
2.
Needle stays at 0:
Cable severed.
1 . Excessive valve clearance.
1. Needle wavers:
Faulty cable.
I
Faulty gear unit,
1
Faulty coupling.
Adjust.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.