Yanmar YSE8 - Yanmar YSE Troubleshooting: Output Decrease

I
6.6
Output Decrease
6-7
Knocking during Oporation
l3
Check
point
Possible cause
Remedy
1.
Compression
2.
Intake/exhaust
valve
1. over/under
clearance. Adjust
to 0.2
mm.
39
3.
Injectiod
1, Stuck
or
worn nozzle.
Colrect
or renew, 19
2.
Pressure
drop,
Adjust
to 160
kglcm2.
20
3. \forn
plunger,
Renew.
18
4.
Scratched or
worn delivery
!alve.
Correct
or
renew.
5.
Uisadjusted
govemor
lever. Readjust.
38
4, Fuel oil
l
Lnsuitable
qu3lit,!.
Change
fuel
oil.
7
5. CombustioD
chamber
1. Carbon
deposit
Remove.
6.
Moving
parts
l.
Stuck
or seized cylinder liner
and
piston.
Correct
ora
renert.
27
30
2. Stuck or seized crankpin
metal.
Correct
or renew.
26
3. Stuck
or
seized
main bearing
metal.
Correct
or
renew.
32
4. Stuck
or seized
piston pin
and
pin
metal.
Correct
or renew.
27
Check
point
Possible cause
Remedy
1.
Tightening
parts
1.
Loose end nut.
Retighten.
2.
Irose connecting
rod bolts
and nuts.
Retighten.
3. Other tightening
parts
loose, Retighten,
2. Moving
parts
1. Worn or seized crankpin
metal.
Renew,
26
2. worn
or
seized mai!
bearing
metal.
Renew.
32
3.
worn or seized
piston
pin
and
pin
metal.
Renew.
27
3.
Intake/exhaust
valve
1, Large cleaiance.
Adjust
to 0.2
mm.
39
a._