MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
206
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Fig. 4-7-14 Removing the rear oil seal and
position signal panel of crankshaft
Fig. 4-7-15 Removing the lower cylinder body
Fig. 4-7-16 Removing the cooling nozzle
assembly
Disassembling the rear oil seal of crankshaft
○
13
Use a rear oil seal remover to take out the rear oil seal
of crankshaft from the oil seal groove of cylinder body.
See Fig. 4-7-14.
Rear oil seal remover: 5-8840-2360-0.
Disassembling the lower cylinder body
○
14
(1) Remove the 10 main bearing cap bolts and the 11
hexagon flange face bolts (M8x80) connecting the
upper and lower cylinder bodies in proper order. See
Fig. 4-7-15.
(2) Remove the lower cylinder body from the upper
cylinder body.
Attention:
Orderly remove the fastening bolts of
lower cylinder body from both sides of cylinder body to
the center.
Disassembling the crankshaft and crankshaft
position signal panel
○
15
(1) Remove the 3 hexagon lobular socket countersunk
head bolts (M6x12) fastening the signal panel and the
rear end of crankshaft.
(2) Take off the signal panel from the rear end of
crankshaft. See Fig. 4-7-14.
(3) Remove the crankshaft from the cylinder body.
Disassembling the cooling nozzle assembly
○
16
Remove the 4 hexagon socket head cap head screws
(M6x12) fastening the 4 cooling nozzles, and take out
the 4 cooling nozzles from the upper cylinder body. See
Fig. 4-7-16.
Inspection and repair
If necessary, adjust, repair or replace the parts heavily
worn or damaged.
(1) Remove the foreign materials adhered on the
packing or the upper surface of cylinder body.
Attention:
——Do not drop any foreign materials into the cylinder
body by accident.
——Do not scratch the upper surface of cylinder body.
Crankshaft
Front oil seal
Rear oil seal
Signal panel
Lower cylinder
body
Upper cylinder
body
Cylinder body
Cooling nozzle
