MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
32
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Section VII Running-in of Engine
The new diesel engine or diesel engine just overhauled (including replacements of the piston, piston ring
or main bearing shell, connecting rod bearing shell) should go through a running-in period during which
the engine should start from a low load to a high load gradually before normal use, and the initial check,
adjustment and maintenance should be carried out during the running-in. Try to make all kinematic pairs
run-in well and prevent abnormal wear and damage. The experiences have testified that the service life,
working reliability and economical efficiency of the diesel engine, to a large extent, lie on the running-in
condition of the diesel engine in the initial stage of use.
1. Preparation Before Running-in
1.1 Operators should read the
Use and Maintenance Manual for GW4D20/GW4D20B Turbocharged
Diesel Engine
carefully to be familiar with the structure, performance, operation and maintenance
methods of the engine.
1.2 Clear up the external surface of diesel engine.
1.3 Check the oil level, and refill oil to the specified oil level if the oil is not enough.
1.4 Check and refill fuel (vehicle diesel), coolant (anti-freezing, anti-rust liquid).
1.5 Check the electrolyte level of the storage battery, and refill to the specified level if the electrolyte is
not sufficient.
1.6 Check if the timing belt is installed properly and if the timing mark is correct.
1.7 Check if the electric line, ECU and harness assembly are correctly and securely connected.
1.8 Set the operating handle of gear box to Neutral.
2. Running-in
Before engaged in work with normal load, the new diesel engine should run-in on the vehicle for 2500
km according to the running-in specification, see Table 2-7-1) or on the test rack for 50 h according to the
running-in specification.
The diesel engine whose piston, piston ring, main bearing shell, connecting rod bearing shell, etc. have
been replaced during the overhaul should run-in on the vehicle for 500 km (according to Table 2-7-2) or
on the test rack for 10 h according to the running-in specification.
During the running-in period, you can carry out further inspection for the assembly quality of all engine
parts and implement adjustment when necessary.
Table 2-7-1 Specificatio
n for New Diesel Engine’s Running-in on Vehicle
Vehicle Traveling
Distance (km)
Vehicle Load
Rotation Speed of Diesel Engine (r/min)
0~300
No-load
Not over 50% the rated rotation speed of the
corresponding diesel engine
＞
301~1000
Not over 50% of the rated
load
Not over 50% the rated rotation speed of the
corresponding diesel engine
＞
1001~1500
Not over 50% of the rated
load
Not over 75% of the rated rotation speed of the
corresponding diesel engine
＞
1501~2500
Full load
Not over the rated Max. rotation speed of diesel
engine
