Chapter V GW4D20 / GW4D20B Turbocharged Diesel Engine
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
369
Fig. 5-20-13 Removing the oil pump assembly
(4) Check the rubber seal ring of oil pump and front oil
seal of crankshaft and replace them if there is any
deformation or damage.
Removing the piston connecting rod assembly
○
12
(1) Unscrew and remove the 8 connecting rod bolts in
two separated times following the order of cylinders 1
st
,
4
th
, 2
nd
and 3
rd
, and take down the 4 connecting rod
covers and the lower connecting rod bearing shell. See
Fig. 5-20-14.
(2) Remove the 4 piston components, the connecting
rod body and the upper connecting rod bearing shell,
and mark them in groups according to the cylinder
order.
Caution:
Special care shall be taken not to hit or
scratch the connecting rod journal or the inner surface
of the connecting rod.
Fig. 5-20-14 Removing the connecting rod
assembly and piston
Fig. 5-20-15 Removing the rear oil seal of
crankshaft
Removing the crankshaft rear oil seal
○
13
(1) Remove the crankshaft rear oil seal from the rear oil
sealing groove behind the cylinder body with special
tools. See Fig. 5-20-15.
Detacher for the rear oil seal: 5-8840-2360-0.
(2) Remove the rear oil seal of crankshaft from the rear
end of cylinder body.
Attention:
when removing the crankshaft rear oil
seal, do not damage the crankshaft and the rear oil seal
seat.
Removing the lower cylinder body
○
14
(1) Remove the 10 main bearing cap bolts
(M11×1.5×87) in order from the lower cylinder body.
See Fig. 5-20-16.
(2) Remove the 11 hexagon flange bolts (M8×80)
connecting the lower and upper cylinder bodies. See
Fig. 5-20-16.
(3) Remove the lower cylinder body from the upper
cylinder body.
Attention:
the removing of the lower cylinder body
fastening bolts shall be performed in the order from the
two sides of the cylinder body to the middle.
Removing the crankshaft and the crankshaft
position signal panel
○
15
(1) Remove the crankshaft from the lower cylinder body.
(2) Remove the 3 hexagon lobular socket countersunk
Outer rotor
Seal ring
Front oil seal
Piston
Connecting
rod
Crankshaft
Connecting rod
cover
Cylinder body
Rear oil seal
