WEICHAI WP2.1C Operation And Maintenance Manual - page 23
Operation and Maintenance Manual for WP2.1C/WP3.9C Series Marine Diesel
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(2) Fuel pipeline or fuel filter clogged.
Dismount fuel pipeline or fuel filter. Clean or replace them.
(3) Air within fuel system.
Bleed fuel system.
Tighten all fuel pipe connections.
(4)Defective injection pump or incorrect
injection timing.
Check fuel feed pump and injection pump. Adjust injection
timing.
(5)No injection or poor characteristics of
spray.
Clean and lap nozzle needle and body in pair. Readjust
nozzle opening pressure.
(6) Ambient temperature too low and engine
too cold.
Heat cooling water.
(7) Insufficient compression pressure in
cylinders.
See item 6.3 hereafter.
(8) Starting motor runs at low speed or will
not run.
See item 6.12 hereafter.
6.2 Lack of Power
Possible Causes
Suggested Remedies
(1) Insufficient compression pressure in
cylinders.
See item 6.3 below.
(2) Wrong grade of fuel or fuel
contaminated with water
Use proper fuel. Clean fuel tank and refill.
(3) Clogged air cleaner.
Clean air cleaner cartridge. Replace cartridge if necessary.
(4) Choked exhaust silencer.
Clear away carbon deposits or dirt from silencer.
(5) Air within fuel system.
Bleed fuel system. Tighten all fuel pipeline connections.
(6) Incorrect valve timing.
Inspect camshaft and marks on gears. Check valve
clearances.
(7) Incorrect fuel delivery advance angle
Check marks on gears. Readjust fuel delivery advance angle.
(8) Low injection pressure or poor spray
characteristics.
Readjust nozzle opening pressure.
(9) Uneven distribution of fuel
among cylinders.
Readjust uniformity of fuel delivery from fuel injection
pump to cylinders.
(10) Engine unable to reach the rated speed.
Reset speed control lever.
6.3 Insufficient Compression Pressure in Cylinder
Possible Causes
Suggested Remedies
(1) Valve clearance too small or no
clearance.
Readjust valve clearance.
(2) Carbon deposits on valve and seat.
Worn valve and seat.
Clear away carbon deposits and relap valve and valve seat.
Ream valve seat if necessary.