Bad Exhaust Color; Momentary High-Speed Revolution; H U N T I N; Output Decrease - Yanmar YSE8 Service Manual

6.3
Bad Exhaust Color
Ir
F
r
I
F
{a:"
I
Check point Possible cause Remedy
1. Operating
conditions
1. Overloaded operation. Reduce load.
2. Output decrease
1 3
3. Fuel oil
1. Unsuitable quality.
Change fuel oil.
7
4. Injection
1. Stuck ot rlorn nozzle,
Correct or renew. 1 9
2. Low injection preaaure.
Adjust to 160 kg/cm2
20
5. Injection timing 1. lnjection lag.
Set to 10 + 2" before TD.c.,
listeoing to injection noise
40
6. Carbon deposit
(Sticky)
1. Stuck or worn piston ring or
oil ring.
Correct or renew.
2 1
2. WoIII cylinder liner or piston.
(Burning oil)
Renew. 2 7
30
6.4
Momentary Hith{peed Revolution
Check point
Possible cause Re6edy
1. Regulator handle l. Sudden operatioD,
Do not move it sudd€nly.
?,. Governor syatem
1. Misadjusted lever, Readjust.
3 8
2. Stuck regulator spindle. Cleao and correct,
6.5
Hunting
Check point Possible cause Remedy
1. Govemor
system
1. Misadj usted lev€r. Readjust.
3 8
2. Stuck regulator spiodle.
Clean and correct.
3, Malfuction of No. I lever
shait.
Correct.
2. Injection 1. Stuck or worn nozzle,
Correct or renew.
2. High or low preasure.
Adjust to 160 kg,/cm2
2 0
3 - r u e l o l l
L. Inferior quality. Change fuel oil.
4. Idjectiod timing 1. Injection advance or lag.
Set to 10 + 2' before TDC.,
listening to injection noise.
40
5. C rankshaft side
gap
1. Large gap. (worn main
bearing)
Renew'
33