Operation and Maintenance Manual for WP2.1C/WP3.9C Series Marine Diesel
16
Power supply of the starting motor is 3.8kW.
Section
Ⅳ
Adjustment
of
the
Engine
4.1 Adjustment of Valve Clearances
It is essential to adjust the valve clearances in operating an engine. The valve
clearances on cold engines are 0.20mm for inlet valves and 0.25mm for exhaust
valves. Apart from the adjustment of valve clearances after reassembling the engine, it
is necessary to check and adjust the valve clearances periodically because of the
possible loosening of adjusting screws and wear of parts in the valve system. The
inspection interval is recommended to be 250 running hours.
The adjustment should be carried out on a cold engine. The procedure is as
follows: Remove the cylinder head cover. Turn the crankshaft until the mark of the
top dead center of the first cylinder on the crankshaft pulley aligns with the pointer of
the timing indicator. When the piston of the first cylinder is at its top dead center on
the compression stroke, both intake and exhaust valves of the first cylinder are closed.
In this position, check the clearances of intake valve and exhaust valve of the first
cylinder, the intake valve of the second cylinder and the exhaust valve of the third
cylinder (i.e. the clearances of the first, second, third and sixth valves counted from
the front) with a feeler gauge.To adjust the valve clearances, slacken the lock nut with
a wrench and hold it, screw in or out the adjusting screw with a screwdriver until the
feeler gauge inserted between the rocker head and the top surface of the valve stem
feels neither too loose nor too tight. Then tighten the lock nut and check the clearance
again. Readjust if necessary till it
is properly set.
After the adjustment of the clearances of the above-mentioned four valves, rotate
the crankshaft a complete turn to place the piston of the forth cylinder at its top dead
center on the compression stroke. In this position, check the clearances of intake valve
and exhaust valve of the fourth cylinder, the intake valve of the third cylinder and the
exhaust valve of the second cylinder (i.e. the clearances of the fourth, fifth, seventh
and eighth valves counted from the front). Adjust the clearances of these valves in the
same way as described above.
4.2 Adjustment of Fuel Injection Timing
In order to maintain fuel economy and power characteristics of the engine, it is
necessary to check and adjust the fuel delivery advance angle after the engine being
reassembled or running for 500 hours.
The procedure for checking and adjusting is as follows:
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