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

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
13
3. Fuel oil
1.
Unsuitable
quality.
Change
fuel
oil.
7
4. Injection
1. Stuck
ot
rlorn
nozzle, Correct
or
renew.
19
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.
21
2. WoIII cylinder liner or
piston.
(Burning
oil)
Renew. 27
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.
38
2. Stuck regulator spindle.
Cleao and
correct,
6.5
Hunting
Check
point
Possible cause
Remedy
1.
Govemor
system
1.
Misadj
usted
lev€r. Readjust.
38
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
20
3- r uel oll 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