WEICHAI WP12C350 Operation And Maintenance Manual Download Page 11

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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.

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 times

otherwise 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 unpacked

the user first should check

diesel engine and accessories according to packing list provided in delivery

check the exterior of diesel engine for damage

connection parts for

looseness

then 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
system

but 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 coolant

the 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

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

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 tank

if the coolant is not enough

open 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 coolant

it is allowed to slowly to add cold water with tempera-

ture not too low from the coolant filler

until 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 dipstick

if necessary, add engine oil from the oil filler on the engine body.

(4) Check whether the connection of diesel engine accessories is reliable

and

eliminate the abnormal phenomenon. Check whether the circuit wiring of start
system is normal

and battery is adequately charged. Then open the valve of fuel

tank

use 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 switch

set the throttle lever to a large fuel

quantity position

push the starting button

and 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 times

stop the starting

find out the

causes and eliminate the failure, and then make another attempt for the starting.

With the engine started

release 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 speed

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 engine

first remove the load

then reduce the engine speed

to 600

1000rpm

and 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