MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
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Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Fig. 2-9-2 Removing the parts on the
cylinder
Fig. 2-9-3 Removing the electrical parts
Fig. 2-9-4 Washing the diesel engine
2.2 Engine repair class
The engine (vehicle) repair class is divided into overhaul,
minor repair, maintenance and adjustment.
2.2.1 Overhaul
The overhaul is the regular repair. During the overhaul,
thoroughly check the engine (vehicle), and repair or
replace the parts which are overly worn. The
performance of the engine which has gone through an
overhaul should be equal or close to that of a new
engine.
The overhaul should be carried out when the wear of the
major parts reaches or is close to its limit; generally, you
can make a repair plan according to the repair interval
(e.g. the accumulative driving distance or the
accumulative fuel consumption of the engine), but
whether to repair depends on the technical condition
determined according to inspection.
2.2.2 Minor repair
The minor repair is balancing repair (or local repair),
mainly aiming to the components or parts which are easy
to wear. In order to balance uneven wear between parts
of the engine, one or two minor repairs between two
overhauls can ensure the engine to work properly within
an overhaul cycle.
The minor repair is also required to be carried out
according to the repair interval (e.g. the accumulative
driving distance or the accumulative fuel consumption of
the engine). But whether to repair mainly depends on the
engine's technical condition.
The minor repair mainly aims at troubleshooting the
engine, local inspection, adjustment and repair, and
replacing the wearing parts.
2.2.3 Maintenance
The maintenance refers to replacing the worn parts in
order to remove the malfunctions and local damage
caused during the use of engine. Different from the minor
repair, the maintenance only aims at troubleshooting,
keeping relevant parts or the assembly working properly,
there is no need to recover the technical performance
index of a certain part or the assembly.
2.2.4 Adjustment
The adjustment refers to readjusting the worn or
disordered parts in order to remove malfunctions caused
during the use of engine. Generally, there isn’t much
removing work on the engine.
3. Exterior Washing for the Engine
After reception of the engine, move it to the location for
