MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
124
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Fig. 4-1-13 Removing the vacuum pump
assembly
Disassembling the vacuum pump assembly
○
13
(1) Pull out the vacuum connecting hose from the
vacuum pump.
(2) Remove the 3 hexagon flange bolts (M6×20)
connecting the vacuum pump to cylinder head ring
flange. See Fig. 4-1-13.
(3) Remove the vacuum pump assembly from the rear
end of the cylinder head exhaust camshaft.
Fig. 4-1-14 Removing the camshaft bearing
cap
Fig. 4-1-15 Removing the intake/exhaust
camshaft
Disassembling the camshaft bearing cap
○
14
(1) Remove the supporting bolts for the 4 fuel injector
ballasts.
(2) Remove the 22 hexagon flange bolts (M6×35 and
M6×20) fastening the camshaft bearing cap in the
sequence from the two sides of camshaft bearing cap to
the center. See Fig. 4-1-14.
(3) Remove the camshaft bearing cap from cylinder
head.
Disassembling the intake/exhaust camshaft
○
15
(1) Take out the intake camshaft and the exhaust
camshaft respectively from the cylinder head. See Fig.
4-1-15.
(2) Remove the plug cover and the front oil seal of
camshaft from the cylinder head.
Check the front oil seal of camshaft and replace it if it
is damaged.
Cylinder head
Vacuum
pump
assembly
Camshaft
bearing cap
Cylinder head
Camshaft
Cylinder head
