Operation and Maintenance Manual
of WP12C Series Marine Diesel Engine
Note˖ķ Angle value is the angle to be tightened after the specified torque
is obtained.
ĸ There are corresponding requirements for strength rating of all bolts and nuts
used on this engine. The bolts and nut with the same specifications but with
different strength rating are not allowed to misfit and exchange.. It is not allowed to
exceed the limit of reusing timesˈotherwise it will cause serious consequence.
3.6 Operation Requirements of Diesel Engine
3.6.1 Depreservation work of new diesel engine
After the diesel engine container is unpackedˈthe user first should check
diesel engine and accessories according to packing list provided in deliveryˈ
check the exterior of diesel engine for damageˈconnection parts for
loosenessˈthen carry out the work as follows˖
(1) Wipe off the antirust coat of exposed parts and anti-corrosion agent, etc.
(2) Drain the preservation oil from the inside of fuel filter and fuel system compo-
nents (it is also allowed to start engine without draining the preserving oil from fuel
systemˈbut to run engine with load is allowed only when the preserving oil in fuel
system is consumed and the normal diesel fuel is delivered.)
However, the preservation period of diesel engine is one year. When the
preservation period exceeds one year, conduct inspection and adopt neces-
sary supplementary measures.
(3) Turn the flywheel and inject the solvent into intake pipe, until the
preservation oil inside cylinder is completely expelled.
(4) Inject the solvent into supercharger inlet and exhaust ports, until
the preservation oil inside is completely expelled.
(5) Add oil to diesel engine oil sump as specified.
(6) Fill the diesel engine cooling system with coolantˈthe coolant
Camshaft gear bolt
Piston cooling injector bolt
Exhaust manifold bolt
Standard M6 bolt
Standard M8 bolt
Standard M10 bolt
Standard M12 bolt
M8-8.8 8˪.+120° 30 2
M10 30˪. 25
M10 15˪.+60° 65 2
8.8 8˪. 10.9 13˪.
8.8 22˪. 10.9 31˪.
8.8 39˪. 10.9 58˪.
8.8 70˪. 10.9 100˪.m
is demineralized fresh water or coolant with anti freeze additive. It is forbidden
to add sea water into cooling system.
3.6.2 Check and Preparation Prior to Starting
(1) Check the coolant level
The cooling level can be seen through glass inspection hole on the expansion
water tankˈif the coolant is not enoughˈopen the coolant filler cap to fill the
coolant. It is forbidden to add a large quantity of coolant while engine is in hot
state, because a great thermal change will damage the parts. If in an emergency
case there is no coolantˈit is allowed to slowly to add cold water with tempera-
ture not too low from the coolant fillerˈuntil the coolant is over-flown.
(2) Check the fuel level
(3) Check the engine oil level
Oil level should be at between the upper scale mark and lower scale marks of
the oil dipstickˈif necessary, add engine oil from the oil filler on the engine body.
(4) Check whether the connection of diesel engine accessories is reliableˈand
eliminate the abnormal phenomenon. Check whether the circuit wiring of start
system is normalˈand battery is adequately charged. Then open the valve of fuel
tankˈuse the hand pump on the delivery pump to expel air out of the fuel system.
3.6.3 Starting Diesel Engine
Turn on the instrument power switchˈset the throttle lever to a large fuel
quantity positionˈpush the starting buttonˈand if the engine is not started in 5
10 sec., repeat the above starting procedure about 1 min later. However, if
engine fails to start successively for three timesˈstop the startingˈfind out the
causes and eliminate the failure, and then make another attempt for the starting.
With the engine startedˈrelease the button immediately, and at the same
time, pay attention to readings of various instruments, the oil pressure gauge
should indicate pressure at once. Do not let the cold engine run at high speedˈ
it is required to run the engine at idle speed for a period of time, but the running
at idle speed should not be too long.
3.6.4 Stopping Diesel Engine
Before stopping engineˈfirst remove the loadˈthen reduce the engine speed
to 6001000rpmˈand wait a few minutes later, move the stop control handle to
shutdown the engine. After stopping, turn off the power of instrument.
Operation and Maintenance Manual
of WP12C Series Marine Diesel Engine
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