Operation and Maintenance Manual for WP2.1C/WP3.9C Series Marine Diesel
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4.5 Adjustment of injection pump
The injection pump has been adjusted and sealed in the factory. It should not be
readjusted by customers except when absolutely necessary. All the service operations
should be carried out by qualified servicemen on an injection pump tester according
to the instructions in the service manual of the injection pump.
4.6 Adjustment of V-belt Tension
Though very easy to adjust, the tension of V-belt has great influence on the
rotational speed of the generator and water pump and hence the operation of the
engine.
It is recommended to adjust it periodically. When engine is not running, press on
the middle of a straight section of the belt with a force of 30～40 N. The sag of V-belt
should be within the range of 10～15 mm. If not qualified, loosen the adjusting bolt
on the adjusting bracket to move the generator to adjust the belt to a proper tension.
Excessive tension will shorten the service life of the belt and cause the premature
wear of bearings in the generator and water pump due to the heavy load resulted from
excessive belt tension. Insufficient belt tension, however, will lead to the belt creep
and fracture, resulting in the engine overheating.
Section
Ⅴ
Technical
Maintenance
Regular maintenance of the engine is essential to efficient and trouble-free
operation, good mileage between major repairs and long service life. General
procedures of different assignments of technical maintenance stipulated below should
be followed in principle. Customers can make some alterations according to particular
service conditions.
The maintenance work schedule is as follows:
1) Shift maintenance
2) Maintenance at the completion of 125 working hours.
3) Maintenance at the completion of 500 working hours.
4) Maintenance at the completion of 1000 working hours.
5.1 Shift Maintenance
A) Check the oil level in oil sump and injection pump. Refill to the specified
level if necessary.
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