MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
6
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Section VII General Repair Instructions
Fig. 1-7-1 Removing the Negative (-) Cable of
Battery
Fig. 1-7-2 Precoating Sealant on Parts
Fig. 1-7-3 Torque Spanner
1. When carrying out repair, use the baffle, seat and
floor mat to keep the vehicle clean and intact and
prevent damage.
2. During disassembly, keep parts in a proper order so
as to facilitate reassembly.
3. The rules that should be observed during repair.
3.1 Before performing electrical repair, disconnect the
negative (-) cable from the storage battery, as shown in
Fig. 1-7-1.
3.2 If it is necessary to disconnect the storage battery
during check and repair, the negative (-) cable of the
storage battery should be disconnected first, as it
connects to the vehicle body and constitutes the earth
wire.
3.3 To prevent damage to the battery terminal, loosen
the fixed nut of the cable connection terminal and raise
the cable connection terminal without twisting or prying
it.
3.4 Clean the battery terminal and the cable connection
terminal with special cleaning cloth; do not scrape them
with a file or other abrasive objects.
3.5 Unscrew the nut when connecting the cable terminal
to the battery terminal, and screw it after installation. Do
not use a hammer to tap the cable terminal onto the
battery terminal.
3.6 Be sure to properly cover the positive pole (+) of the
storage battery.
4. Check the hose and conductor connector to ensure
secure and correct connections.
5. Non-reusable parts: as for splint pins, gaskets, O
rings, oil seals, etc., replace them with new parts.
6. Precoated parts: refer to parts that are coated with
sealant in the factory, bolts and nuts, etc., as shown in
Fig. 1-7-2.See Fig. 2-6-8 for positions to coat sealant on
engine parts,.
6.1 If a precoated part is re-tightened, loose or loosened
in any way, it must be recoated with the specified
sealant.
6.2 When reusing a precoated part, clear the old sealant
away from the part surface or the threaded hole, and
clean the surface or the hole with compressed air. Then
apply the specified sealant to the specified position, as
shown in Fig. 1-7-2.
Sealant
Indicating torque spanner
Scale indication torque spanner
