Lack Of Power; Insufficient Compression Pressure In Cylinder - WEICHAI WP2.1C Operation And Maintenance Manual

Operation and Maintenance Manual for WP2.1C/WP3.9C Series Marine Diesel
(2) Fuel pipeline or fuel filter clogged.
(3) Air within fuel system.
(4)Defective injection pump or incorrect
injection timing.
(5)No injection or poor characteristics of
spray.
(6) Ambient temperature too low and engine
too cold.
(7) Insufficient compression pressure in
cylinders.
(8) Starting motor runs at low speed or will
not run.

6.2 Lack of Power

Possible Causes
(1) Insufficient compression pressure in
cylinders.
(2) Wrong grade of fuel or fuel
contaminated with water
(3) Clogged air cleaner.
(4) Choked exhaust silencer.
(5) Air within fuel system.
(6) Incorrect valve timing.
(7) Incorrect fuel delivery advance angle
(8) Low injection pressure or poor spray
characteristics.
(9) Uneven distribution
among cylinders.
(10) Engine unable to reach the rated speed.

6.3 Insufficient Compression Pressure in Cylinder

Possible Causes
(1) Valve clearance too small or no
clearance.
(2) Carbon deposits on valve and seat.
Worn valve and seat.
Dismount fuel pipeline or fuel filter. Clean or replace them.
Bleed fuel system.
Tighten all fuel pipe connections.
Check fuel feed pump and injection pump. Adjust injection
timing.
Clean and lap nozzle needle and body in pair. Readjust
nozzle opening pressure.
Heat cooling water.
See item 6.3 hereafter.
See item 6.12 hereafter.
See item 6.3 below.
Use proper fuel. Clean fuel tank and refill.
Clean air cleaner cartridge. Replace cartridge if necessary.
Clear away carbon deposits or dirt from silencer.
Bleed fuel system. Tighten all fuel pipeline connections.
Inspect camshaft and marks on gears. Check valve
clearances.
Check marks on gears. Readjust fuel delivery advance angle.
Readjust nozzle opening pressure.
of fuel Readjust uniformity of fuel delivery from fuel injection
pump to cylinders.
Reset speed control lever.
Readjust valve clearance.
Clear away carbon deposits and relap valve and valve seat.
Ream valve seat if necessary.
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Suggested Remedies
Suggested Remedies