STEYR MOTORS Marine Engine 2012 Series, Service Manual

Page: 68 / 274

Engine
3/87 Z001138-1_2013-02-01
Items to Check / Troubled Systems
Piston / Combustion - Mechanical system
[Factors/Cause of Trouble]
Inferior s
tarting
perfo
rman
ce of
engine
Larg
e
fuel co
nsum
ption
Larg
e
lube oil
con
s
umptio
n
Exhau
st sm
o
k
e ab
normal
unsta
ble idle
runni
ng / re
vs.
Larg
e
blo
w
-b
y ga
s
emission
*
Knocking n
o
is
e
Low comp
re
ssion
p
re
s
sure
Low (drop in)
engin
e
outpu
t
Wrong po
sitio
n
of eccentri
c
shaf
t
engin
e
run
n
in
g awa
y
leaki
ng o-ring
at unit
injector leaki
ng oil co
oler
raw
wate
r ent
ry throug
h
e
x
ha
us
t s
y
s
tem
black sm
oke emission
white sm
oke emission
blue sm
oke e
m
issi
on
fuel oil strea
k
s on water
s
u
rf
ac
e
thermo
stat st
uck ope
n
Check cylinder leckage rate (val
ve & piston ri
ng
)
Too much oil in the oil pan / oil level too high • • • • • •
Faulty valve clearance • • • • • • •
Faulty engine timing / valve timing • • •
Excessive delay in injection timing • • • • • •
"Oil leak down" from the valve stem / seal • • •
Wear of piston rings and cylinder liner • • • • • • • • •
Overcooling of engine • • •
Missing or insignificant compression each
cylinder
• • • • • •
Bad or inclompete fuel dispersion in piston board • • • • • •