Operation and Maintenance Manual for WP2.1C/WP3.9C Series Marine Diesel
7
2.2 Running-in of the Engine
A new engine or an overhauled one should not be run under rated conditions
before it has gone through 50 hours of running –in under part load. Only 2 hours of
running-in of the new engines is carried out on the test bench. They should be run
about 20 hours under half or lighter load before normal service at rated conditions.
Operating an engine under heavy load without going through the running-in period
may cause excessive wear, resulting in a reduction of service life or even damages to
the cylinder, piston and bearings.
After the replacement of any of the important parts such as the piston, piston ring,
cylinder liner, crankshaft, main bearing and connecting rod bearing, the engine should
be run at low speed and under light load for 10 to 15 hours before normal service.
If anything abnormal occurs during the running-in period, stop the engine to
check for the cause and make corrections.
After running-in proceed to the following operations:
Drain off the oil in the oil pan immediately after stopping the engine. Clean oil
pan and strainer with diesel oil.
Replace the oil filter cartridge.
Check and adjust valve clearance.
Check and retighten all the external securing bolts and nuts.
Check and eliminate any abnormality.
Lubricating maintenance.
2.3 Preparations for Starting
2.3.1 Check the tightness and security of the mounting of engine parts and
accessories, including the injection pump, fuel filter, lubricating oil filter, generator,
electric starter, water pump, fan, pulleys, etc. Check the freedom of movement of the
fuel injection pump control levers.
2.3.2 Fill the engine with clean fuel oil, lubricating oil and cooling water as
specified
in Section 2.2. Check the oil level in the oil sump. Oil level in the oil sump
should be near to the upper mark on the dipstick but not above it.
2.3.3 Check for the leakage of oil and water.
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