Komatsu PC130-8, Shop Manual

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40 Troubleshooting SEN04125-02
PC130-8
17
S-8 Oil consumption is excessive (or exhaust smoke is blue) 1
General causes why oil consumption is excessive
q Abnormal consumption of oil
q Long-time operation of engine at low idle or high idle
(Do not run engine at idle for more than 20 minutes
continuously)
q External leakage of oil
q Wear of pats in lubrication system
Causes
D
u
st
s
u
cked
in
f
rom
i
n
ta
ke
syst
em
W
o
rn,
dama
ged
v
a
lv
e
(s
te
m
, guide,
seal)
T
u
rbocharger
Clogged breat
h
er
,
breat
her hose
Bro
k
en p
is
ton
ring
W
o
rn
pis
ton ring,
cylinder
W
o
rn,
dama
ged rear
oil s
e
al
Bro
k
en o
il
cooler
O
il leakage f
rom
o
il cooler
Oi
l leak
age f
rom
o
il f
ilt
er
O
il leakage f
rom
o
il pi
ping
O
il leakage f
rom
o
il drain
plug
O
il leakage f
rom
o
il p
an,
cy
linder head,
et
c.
W
orn s
eal at
t
urbine end
W
orn s
eal at
blower
end
Q
uest
io
n
s
Confirm recent repair history
Degree of use of machine Operated for long period
E E E E
Oil consumption suddenly increased
w Q
Oil must be added more frequently
w Q
Oil becomes contaminated quickly
Q Q w
Outside of engine is dirty with oil
w w w w w
There are loose piping clamps in intake system
w
Chec
k
it
em
s
Inside of turbocharger intake outlet pipe is dirty with oil
w
Inside of turbocharger exhaust outlet pipe is dirty with oil
Q w
There is oil in coolant
w
Oil level in clutch chamber or damper chamber is high
w
Exhaust smoke is blue under light load
w w
Amount of blow-by gas
Excessive
Q Q w w
None
w
T
roub
les
hoot
ing
When intake manifold is removed, dust is found inside
q
When intake manifold is removed, inside is found to be dirty abnormally
q
Excessive play of turbocharger shaft
q q
Check breather and breather hose directly
q
When compression pressure is measured, it is found to be low
q q
Inspect rear oil seal directly
q
Pressure-tightness test of oil cooler shows there is leakage
q q
There is external leakage of oil from engine
q q q q
Remedy
Correc
t
Replace Replace Replace
Clean
Replace Replace Replace Replace Replace
Correc
t
Correc
t
Correc
t
Correc
t