MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
52
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Fig. 2-10-2 Tightening sequence for the
fasteners
Fig. 2-10-3 Torque spanner
into the assembling location should be clean in order to
maximally reduce impurities and dust brought into the
location.
1.5 The assembling sequence should comply with the
flow proces
s and abide by the rule of ―from interior to
exterior‖ and ―from parts to assemblies‖(parts→
components→assemblies→complete machine).
1.6 In order to improve the assembling efficiency, parts
should not be assembled on the assembling line if it can
be assembled on the component.
1.7 Combination of the spare parts should strictly comply
with relative technical documents. The combination of
the spare parts which are classified by size or quality
should strictly comply with provisions.
1.8 All parts subjected to static balance test and dynamic
balance test should be balanced, or else they are not
allowed to be installed.
1.9 Fasteners should be tightened in accordance with
tightening specifications. The fastener tightened with
plastic zone tightening angle process should not be
reused to ensure reliable connection of the connectors.
Generally, the tightening sequence should be from
center to two ends and from interior to exterior; the parts
should be tightened diagonally. The tightening torque for
fasteners of diesel engine are listed in Table 2-6-1, Table
2-6-2, and the fastener should be tightened as the
sequence showed in Fig. 2-10-2.In order to avoid
missing tightening, important fasteners which have been
tightened should be marked.
―Caution‖: Tightening torque for the fastener should
strictly comply with relative specifications, and use the
torque
spanner
strictly
according
to
technical
requirements (see Fig. 2-10-3).
Fig. 2-10-4 Applying a proper amount of
lubricating oil to fasteners
1.10 When assembling, fill or apply API CI-4 engine oil
on the friction surfaces of dynamic matching parts (see
Table 2-6-7)The thread engagement of fasteners should
be lubricated with a proper amount of oil. See Fig.
2-10-4.
1.11 Water/air tight junction surfaces should be clean.
Damage, oil dirt and dust which affect tightness are not
allowed. Apply sealant in accordance with requirements
(see Table 2-6-8). Apply a proper amount of lubricating
oil to oil groove at the lip of oil seal assembly, and
assemble it with guide tools. It is not allowed to damage
the lip in order to ensure tightness.
1.12 The assembling position, sequence and matching of
the parts should be correct; interference, missing
assembling and wrong assembling are not allowed.
Indicating type torque spanner
Scale indicating type torque spanner
Lubricate it with engine oil.
Front end
