Callesen Diesel Page 10 of 12 Sheet No. 7-94-2A
1. That there is no fuel supply, either because the fuel tank is empty, the fuel filter clogged
, or the
overflow valve not in order; when the outlet pipe on the filter has been removed it should be
possible to pump the oil through in full jet by means of the feed pump. There may be air in the
fuel feed pipes. (The injectors should squeak, when the engine is turned)
2 There may be water in the fuel oil pipes. The lowest cock on the coarse filter must be opened
about every week to drain off any water and mud.
3. The governor may be wrongly adjusted, so that the engine does not receive any fuel. (Perhaps
you may have forgotten to open a little).
4. The feed pump may be defective (spring broken).
5. The fuel pumps may be defective, perhaps the pump spring is broken.
6. The cylinders and pistons of the fuel pumps are worn out so that the quantity of fuel is too small
for starting. Cylinders and pistons must be replaced.
7. Leaking valves.
8. Seized piston rings.
9. Clogged suction filters.
IDLING:
The engine will, after having been started and still being cold, run at varying revs, especially at slow
speed. After having run for some minutes and being warmed up, it should run at absolute regular
revs. If this is not the case, there may be air in the fuel feed pipes; or it may be due to the governor;
or perhaps the toothed rods in the fuel pumps are jamming. If the fuel pumps have been adjusted,
uneven adjustment of the pumps may be the cause. - Normally there are small marking lines and
numbers 10-15-20-25 etc. on the toothed rods of the fuel pumps. When the toothed rods are pushed
forward as far as possible, the marks 28-29 should stand on level with the arrows on the rear end of
the pumps, corresponding to max. load of the engine. In case the toothed rods have been wrongly
adjusted, these marks can in an emergency be used for new adjustment of the pumps (normally the
starting up should be carried out with measuring glass).
LOADING OF THE ENGINE:
If the engine does not operate with its usual power, the fault may be:
1. Air in the feed pipes.
2. Soot in the fuel filter.
3. A defect in the injectors. Injection pressure by hand-pumping 240 kp/cm².
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