6 SECTION 10 -- ENGINE -- CHAPTER 1
84176554 -- 03--2008
ENGINE TROUBLESHOOTING
(cont)
Problems Possible Causes Solutions
Engine produces excessive
black or dark grey smoke.
1. Maximum delivery of injection
pump too high.
Calibrate pump on test bench to va-
lues specified in calibration tables.
2. Injection pump delivery excess-
ively retarded or automatic ad-
vance regulator damaged.
Adjust injection pump timing or check
automatic advance regulator.
3. Injection pump delivery excess-
ively advanced.
Adjust injection pump timing.
4. Injectors partially or totally ob-
structed or incorrectly adjusted.
Clean and overhaul injectors and ad-
just pressure setting; replace if
necessary.
5. Air filter clogged. Clean filter unit and replace filter el-
ement if necessary.
6. Loss of engine compression due
to:
-- piston rings sticking;
-- cylinder liner wear;
-- worn or incorrectly adjusted
valves.
Replace damaged parts or, if necess-
ary, overhaul the engine.
7. High--pressure fuel lines dam-
aged.
Inspect and replace if necessary.
Blue, grey--blue or grey--
white smoke.
1. Injection pump delivery excess-
ively retarded or automatic ad-
vance regulator damaged.
Adjust injection pump timing or check
automatic advance regulator.
2. Injectors obstructed or damaged. Clean, overhaul and calibrate injec-
tors, replace if necessary.
3. Oil leaking past piston rings due
to sticking rings or cylinder liner
wear.
Replace damaged parts or, if necess-
ary, overhaul the engine.
4. Oil leaking through the inlet valve
guides due to guide or valve stem
wear.
Overhaul cylinder head.
5. Engine does not reach correct
operating temperature (thermo-
stat faulty).
Replace the thermostat.
Engine runs on after
switching off.
1. Engine stop electromagnet dam-
aged.
Replace electromagnet.
2. All--speed governor damaged. Overhaul injection pump and adjust
on test bench to values specified in
calibration table.
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