WEICHAI WP3.9C User Manual

Operation and Maintenance Manual for WP2.1C/WP3.9C Series Marine Diesel 
22
(3) Piston ring worn or lack of tension. Replace piston ring.
(4) Piston ring stuck due to carbon deposits. Clean piston and rings in kerosene.
(5) Cylinder liner and piston worn.
Clearance between cylinder and piston too
big.
Replace liner and piston or rebore liner and use oversize
p
iston.
(6) Leakage in cylinder head gasket face. Retighten cylinder head bolts or replace the gasket.
(7) Gas leakage in injector mounting bore. Check copper washer. Reset injector.
(8) Broken valve spring. Replace valve spring.
(9) Valve stuck in valve guide. Clean valve in kerosene. Replace if it is worn out or deformed.
6.4 Engine Stalls
Possible Causes Suggested Remedies
(
1
)
No fuel in tank. Refill fuel t
a
nk.
(2) Air and water in fuel system.
Bleed fuel system. Drain water from fuel tank. Replac
e
cartridge of fuel filter.
(3) Clogged fuel filter. Clean or replace cartridge.
(
4
)
Choked ai
r
cleane
r
. Re
p
lace air cleaner ca
r
trid
g
e.
(
5
)
Piston stuck in c
y
linder. Re
p
ai
r
o
r
re
p
lace
p
iston and c
y
linde
r
liner.
6.5 Engine Racing
Possible Causes Suggested Remedies
(1) Faulty governor
Stop the engine. Dismount injection pump and governor.
Repair or replace governor.
(2) Restricted injection pump control
rod.
Stop the engine. Repair injection pump.
(3) Clip ring disconnected from control
r
o
d
Stop the engine and check. Reinstall clip ring.
6.6 Abnormal Noise
Possi
b
le Causes Su
gg
ested Re
m
edies
(1) Engine detonating with clear knocking
noise in cylinder.
Readjust injection timing.
(2) Delayed combustion. Backfire i
n
exhaust pipe.
Readjust injection timing.

WEICHAI WP3.9C Specifications

General

Brand	WEICHAI
Model	WP3.9C
Category	Engine
Language	English