21
Maintenance
Engine Troubleshooting
POSSIBLE CAUSES
SYMPTOM
Low fuel level
X
X
X
Fuel supply/return lines clogged
X
X
X
X
Clogged fuel tank vent
X
X
Fuel pump faulty
X
X
X
Fuel entrained with air
X
X
X
X
Unit injector(s) faulty/worn
X
X
X
X
X
X
X
Unit injector settings incorrect
X
X
X
X
X
X
X
Injection pump rack sticking
X
X
X
Oil level too high
X
X
X
X
X
X
X
Improper oil viscosity
X
X
X
Oil diluted by fuel
X
X
X
X
X
Oil pressure relief valve faulty
X
Oil pick-up tube clogged
X
Oil pump air entrained at pick-up tube
X
Glow plugs faulty
X
X
Glow plug controller faulty
X
Glow plug relay inoperable
X
Starter defective
X
Battery voltage too low
X
Battery-cable connections corroded
X
Key switch defective
X
Air filter clogged
X
X
X
X
X
X
X
Excessive idle/light load operation
X
X
X
X
Incomplete engine run-in
X
X
X
Engine overload
X
X
X
X
X
X
X
Excessive parasitic load
X
X
X
Valve lash insufficient/excessive
X
X
X
X
Injection timing out of spec-advanced
X
X
X
X
X
Injection timing out of spec-retarded
X
X
X
Governor linkage adjustment incorrect
X
X
X
X
Governor spring fatigued or defective
X
X
X
Idle rpm too low
X
X
Piston rings worn or stuck
X
X
X
X
X
Piston worn or damaged
X
X
X
X
X
X
X
Cylinders worn or damaged
X
X
X
X
X
X
X
Valve(s) guide(s) worn
X
X
X
X
X
Valves sticking
X
X
X
X
X
X
X
Bearings (main/road) worn
X
X
X
Governor linkage malfunction
X
X
X
X
X
Cylinder head gasket damaged
X
X
X
Thermostat stuck or malfunctioning
X
Engine seized
X
Radiator clogged (external or internal)
X
Coolant pump faulty
X
Turbocharger faulty
X
X
X
X
X
X
X
Landa SLT/SLX Kubota Diesel Operator’s Manual 9.807-540.0 - E
Eng
in
e doe
s not
st
ar
t
E
n
gi
ne
s
ta
rt
s
b
u
t
st
ops
Po
or a
cce
le
ra
ti
o
n
Uns
te
ady
RPM
Bl
ac
k smo
ke
Whi
te smo
ke
Blue smo
ke
Low
o
il
pr
ess
ur
e
Oi
l le
ve
l r
is
ing
E
xce
ss
iv
e o
il
con
s
um
ption
We
t e
x
h
au
st
Ove
rh
ea
ting
E
n
gi
ne
k
n
o
cks
Summary of Contents for SLT Series
Page 26: ...9 807 540 0 Printed in U S A...
