Service Manual
of WP12C Series Marine Diesel Engines
Weichai Power Regulations on Quality Assurance
for Diesel Engine used in Marine Electric Machinery
Base
com-
po-
nents
1
1
2
3
Serial number
,
Whole diesel engine
,,
Diesel engine components
Product models
Quality assurance period
12 months or 1500 hours
Notes
Engine body, crankshaft, engine seat, connecting
rod.
Impor-
tant
com-
po-
nents
Vulner-
able
com-
po-
nents
2 years or 3000 hours (only
limited to defects in
production process, such as
sand oil).
According to the above
quality assurance
period for the whole
diesel engine.
Subject to
the date
when they
are actually
purchased,
which shall
be evidenced
by the sales
invoice,
warranty
card, or
reading on
the meter.
Subject to
quality
assurance
period or the
specified
number of
kilometers
(or hours),
whichever
expires early.
1 month
Cylinder head, flywheel, flywheel housing, timing
gear chamber, connecting rod bolt, piston, piston
ring, piston pin, main spindle bush, camshaft bush,
camshaft, cylinder liner, valve, valve spring, valve
seat, valve guide, valve shroud, tappet, lifter,
rocker arm and rocker arm shaft, WEVB system,
various gears, gear shaft, tension wheel, gear ring,
oil pump, intake/exhaust pipe, front/rear support
bracket, belt pulley, flange, water tank, high-
pressure fuel pump, fuel injection valve, oil pump
bracket, coupler, air-compressor, various covering
and backing plates, water pump, oil cooler, fan
bracket, silicon oil clutch, pressure limiting valve,
vibration
damper,
crankshaft
balancing
mechanism, rear oil seal, various oil and water
pipes and joints, power steering pump, thermostat,
oil-gas separator, cylinder cushion, ECU,
common-rail pipe, high-pressure fuel pipe, air filter
body, oil filter body, muffler, thrust plate, suction
filter, idle speed boost, oil dip rod tube, cooling oil
nozzle, front and various other oil seals,
turbocharger, intake pipe gasket, exhaust pipe
gasket, turbocharger gasket, valve gasket, rubber
hose, oil injector’s return pipe, fuel supply pump,
oil level gauge, fan, waterproof and oil proof rubber
rings, bowl-shaped plug, starter, power generator,
meters and instruments, various sensors,
accelerator pedal, wire harness, electro-magnetic
valve, flame preheating device
Belt, fan shroud, oil nozzle, plunger coupled parts, other
gaskets, various weaved hose, hoop.
Notes:
1. If the timing meter for marine diesel engine is damaged, the quality assurance period shall be calculated at
15 hours/day.
2. The warranty period may be calculated form the date when the diesel engine is readjusted and tested, but
under no circumstances shall such date go beyond half a year after purchasing such engine.
Diesel engine used in vessels, diesel
generator and other power facilities.
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