Operation and Maintenance Manual
of WP12C Series Marine Diesel Engine
3.3 Routine Maintenance of Diesel Engine
3.3.1 When diesel engine is in operation, pay attention to oil temperature, oil
pressure, diesel engine outlet water temperatureˈcheck the oil, water, air
for leakageˈif any abnormal case occurˈfind out the causes immediately
and remedy failures timely.
3.3.2 After diesel engine shutdown, check the quantity of fuel, fresh water
coolant, oilˈif it is insufficient , fill it to a specified quantity.
3.3.3 Drain water out from the fuel filter of the first stage.
3.3.4 Check the tension of drive beltˈif necessary, conduct the adjustment.
3.3.5 If the environmental temperature is lower than 0? and no anti-freeze
additive is used in coolant, it is necessary to completely drain the cooling
water to prevent damage to engine due to freezing.
3.4. Maintenance and Service of Diesel Engine during Long-
term Storage
3.4.1 Preservation method
Fill the lubrication system anti-corrosive agent into lubricating oilˈ
conduct pre-start preparation according to the normal running of diesel
engineˈstart and run the engine for 510min and then stop the engineˈ
put the fuel system preservation oil into a clean containerˈdisconnect the
existing fuel inlet pipe of diesel engine and insert it into the containerˈ
remove the air from the fuel systemˈstart and run the diesel engine for
continuous operateion at 2ˋ3 rated speed for 15min and then stop the
engineˈuse the starter motor to drive the
Replace fuel filter
Clean coarse filter of fuel pump
Check coolant quantity, add to full
Tighten pipe clamp of cooling pipeline
Tighten intake pipeline and hose
Clean air filter element
Check fastening V-belt
Check fuel injection pump in special workshop
Adjust idle speed
Note˖▲Mark indicates maintenance required
diesel to runˈand use a high pressure gun with inlet and exhaust pipe
preservation oil to spray the preservation oil to supercharger air inletˈuntil
exhaust pipe or supercharger exhaust discharges oil mist for 15S. Remove
the preservation oil pipelineˈuse plastic caps to close all the exposed pipe
openings. Apply anti-corrosion oil to all the unpainted surface of diesel
engine (except for diesel engine monitor instrument, rubber hose and diesel
engine warning plate). Wrap diesel engine with plastic bags, and place the
engine in a ventilated and dry room.
3.4.2 Preservation oil used for diesel engine
Table 4 Diesel engine preservation oil
˯/N Description Specifiations. (code)
1 Preservation oil of fuel system Spindle oil
2 Preservation oil of inlet and exhaust pipe Spindle oil
3.5 Tightening Torque and Method for Main Bolts and Nuts of Diesel Engine
Table 3 Tightening torque and method for main bolts and nuts of diesel engine
Length (mm)
169
25,210
185
195ˈMin.175mm
protrude from
the cylinder block
75
30
120
67.5
90
50
Requirements
140˪.+210°
8˪.+30
60˪.+2×120°
20+10˪.
Seal with Loctite
262 sealant
25˪.+2×120°
45˪.+135°
15N.mˇ30°
105˪.+270°
Manual tightening
115˪.+90°
Automatic tightening
80˪.+153°
105˪.
8˪.+90
Specifications
M18-10.9
M8-8.8
M14-10.9
M12×1.5-8.8
M12×1.5-10.9
M10-8.8
M16×1.5-10.9
M14×1.5-10.9
M12×1.5-10.9
M8-8.88
Descriptions
Main bearing bolt
Crankcase secondary bolt
Cylinder head main bolt
Cylinder head secondary bolt
Cylinder head secondary nut
Crankshaft pulley bolt
Bolt for tensional
vibration damper
Flywheel bolt
Connecting rod bolt
Idler gear bolt pin
Injector clamping bolt
!
Allowable times
to be used
2
2
3
3
3
2
2
2
3
Operation and Maintenance Manual
of WP12C Series Marine Diesel Engine
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