Water Pump Drive Belts
Check the tensions of the sea (4.154 M) and fresh water pump drive belts. When correctly adjusted, the depression of the
belt by the thumb between water pump and crankshaft pulley should be approximately 3/8" (10 mm).
Seacocks and Strainers
Ensure that seacocks are open prior to starting the engine and that, after the engine has started, there is a flow of water
from the discharge pipe. The interval between the cleaning of the strainer is left to the discretion of the operator but
regular checks should be made to ensure there are no restrictions. Fig. 13 depicts a typical seacock.
Fig. 13
Thermostats
The thermostat, by controlling engine operating temperature within a given range, plays an important part in the operating
efficiency and life of an engine. Therefore it is essential that it functions correctly at all times.
LUBRICATING SYSTEM
The importance of correct and clean lubrication cannot be stressed too highly. Care should be taken in the selection of oil
to ensure that it is correct for the climatic conditions. The oil pan should be filled to the correct level but DO NOT overfill
above the full mark.
Because of the variance in delivery of the lubricating oil pump and scavenge pump, the following procedure is
recommended for horizontal 6.354 engines when changing the lubricating oil.
1.
Fill engine oil pan to full mark on the dipstick.
2.
Run the engine until at normal operating temperature, idle engine for two minutes and shut down.
3.
Top up oil pan to full mark on dipstick. This replaces residual oil remaining in the crankcase.
For routine oil level checks, horizontal engines should be idled for two minutes before reading the dipstick. The oil level
should not be checked with the engine running at speeds in excess of 1000 rpm, or if the engine has been shut down from
speeds of over 1000 rpm without the two minutes idling period.
Oil Pressure
Engine oil pressure should be 30/60 psi (2.1/4.2 kgf/cm2) at normal operating speed and temperature. It is normal for the
pressure to drop while the engine is idling and when the oil is hot.
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