Chapter V GW4D20 / GW4D20B Turbocharged Diesel Engine
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
351
Caution:
Carry out removal with care, do not
collide or scratch the connecting rod bearing journal
and inner surface.
Fig. 5-19-14 Removing the rear oil seal of
crankshaft
Fig. 5-19-15 Removing the lower cylinder
body
Fig. 5-19-16 Removing and installing the
crankshaft and the position signal panel
Removing the rear oil seal of crankshaft
○
12
(1) Use a rear oil seal remover to take out the rear oil
seal of crankshaft from the oil seal groove of the
cylinder body as shown in Fig. 5-19-14.
Detacher for the rear oil seal: 5-8840-2360-0.
(2) Check the rear oil seal of crankshaft and replace it if
there is any damage or deformation.
Removing the lower cylinder body
○
13
(1) Remove 10 main bearing cap bolts orderly.
(2) Remove 11 hexagon flange bolts (M8×80)
connecting the lower cylinder body and the upper
cylinder body. See Fig. 5-19-15.
(3) Remove the lower cylinder body from the upper
cylinder body.
Attention:
Remove the fastening bolts of the lower
cylinder body from both sides of the cylinder body to the
middle in proper order.
Removing the crankshaft and the crankshaft
position signal panel
○
14
(1) Remove 3 hexagon lobular socket countersunk
head screws (M6×12) that fix the signal panel, as
shown in Fig. 5-19-16.
(2) Take down the signal panel from the rear end of the
crankshaft.
(3) Remove the crankshaft from the inner side of the
cylinder body, and check the wear conditions of the
surfaces of the crankshaft main bearing journal and the
crank pin and the matching surface of the crankshaft oil
seal, and the blockage conditions of the crankshaft oil
hole.
Installation
Installing the crankshaft and the crankshaft position
signal panel
○
14
(1) Optionally install the main shaft bearing shell
according to table 4-4-1 and 4-4-2.Install the upper
main shaft bearing shell with oil groove and oil hole to
the upper cylinder body; and install the lower main shaft
bearing shell without oil groove and oil hole to the lower
cylinder body. A wrong installation is not allowed. See
Fig. 5-19-17. After installing the upper and lower main
Cylinder body
Rear oil seal
Lower cylinder
body
Upper cylinder
body
Crankshaft
position signal
panel
Crankshaft
Flywheel gear ring
assembly
