WEICHAI WP2.1C Operation And Maintenance Manual - page 27
Operation and Maintenance Manual for WP2.1C/WP3.9C Series Marine Diesel
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6.11 Deterioration of Lubricating Oil
Possible Causes
Suggested Remedies
(1) Piston ring worn or stuck in groove,
causing combustion gas or fuel to leak into the
oil sump.
Clean or replace piston ring.
(2) Water leaking into oil due to faulty
cylinder gasket.
Replace gasket.
(3) Water leaking into oil due to crack in
cylinder head.
Replace cylinder head.
6.12 Trouble Shooting in Electrical System
Symptoms and causes
Suggested Remedies
A)Faulty generator, no recharging of battery or
current too weak.
1)Loose connections on generator and battery
or corroded contacts.
Check and tighten all connections. Clean contacting surfaces
and improve insulation.
2)V-belt slip.
Readjust belt tension.
3)Generator out of order.
Check and repair.
B)Current too strong and generator overheated.
1)Short-circuit between armature and field coil. Repair or replace.
2)Faulty voltage regulator.
Repair or replace.
C)Resistor of regulator burnt out
1)Battery terminals incorrectly connected.
Reconnect cables.
2)Cutout relay out of order, current reversed at
low engine speed.
Repair or replace.
D) Starting motor will not run.
1)Loose connection of cables.
Clean off dirt. Tighten connections.
2)Battery not fully charged.
Check and recharge it.
3)Bad contact of brushes.
Clean and polish with fine sandpaper.
4)Short-circuit within starting motor.
Check and repair.
E)Starting motor will run idle but unable to
crank the engine up.
Symptoms and Causes
Suggested Remedies
1)Bad contact of brush.
Clean and polish with fine sandpaper.
2)Bad contact of cable connection and switch.
Clean off dirt. Tighten all connections.
3)Weak battery.
Check and recharge it.