HATZ Diesel 1D90 - Manual (Page 35)

34
Malfunction Possible causes Remedial action Chap.
Low engine power,
output and speed.
Low engine power,
output and speed,
black exhaust
smoke.
Engine runs very
hot. Cylinder head
overheat, telltale
lamp (optional
extra) comes on.
Fuel supply is obstructed:
- Tank run dry.
- Fuel filter blocked.
- Tank venting is inadequate
- Leaks at pipe unions.
- Air in the fuel system.
- Speed control lever does not
remain in selected position.
Air cleaner blocked.
Incorrect valve clearances.
Malfunction at injector.
Too much oil in engine.
Inadequate cooling:
- Entire cooling air system
contaminated.
- Inadequate sealing at air guide
plates or capsule elements.
Add fuel.
Renew fuel filter.
Ensure that tank is adequately
vented.
Check threaded pipe unions for
leaks.
Check fuel system for
penetration of air.
Check air vent valve.
Prevent speed control from
moving.
Remove dirt from air cleaner.
Adjust valve clearances.
See workshop manual.
Drain off engine oil down to
upper mark on dipstick.
Clean cooling air system.
Check that air guide plates and
enclosure elements are all pres-
ent and make a tight seal.
4.1.3.
4.1.4.
5.4.1.
5.3.1.
5.4.2.
5.3.3.
5.3.2.
5.3.4.