MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
290
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Fig. 5-10-11 Removing the hydraulic
clearance adjuster and rocker arm
Fig. 5-10-12 Removing the cylinder head
assembly
Fig. 5-10-13 Removing the vacuum pump
assembly
Removing the rocker arm and hydraulic clearance
adjuster
○
11
(1) Take 16 hydraulic clearance adjusters and 16 rocker
arms respectively out of the corresponding holes on the
cylinder head. See Fig. 5-10-11.
(2) Mark the removed rocker arms and hydraulic
clearance adjusters and put them in proper order so as
to carry out the installation in original order.
Removing the cylinder head assembly
○
12
(1) Remove the clamp at the connection of the EGR
condenser water outlet pipe and the EGR condenser.
(2) Remove the clamp at the connection of the oil cooler
water inlet pipe and outlet pipe component.
(3) Remove the cylinder head assembly: loosen orderly
the 10 bolts (M11×1.5×162) for fastening cylinder head
and cylinder body. See Fig. 5-10-12.
Warning:
if the cylinder head bolts are not orderly
unscrewed in separated times, the lower surface of the
cylinder head might be damaged.
Removing the vacuum pump assembly
○
13
(1) Pull out the vacuum connecting hose from the
vacuum pump.
(2) Remove the 2 hexagon flange face bolts (M6×20)
connecting the vacuum pump and cylinder head flange.
See Fig. 5-10-13.
(3) Remove the vacuum pump assembly from the rear
end of the cylinder head exhaust camshaft.
Removing the cylinder head gasket
○
14
(1) Take off the cylinder head gasket from the cylinder
body.
(2) Check the cylinder head gasket. It must be replaced
if burned, deformed or lacking elasticity.
Hydraulic clearance adjuster
Cylinder head
Cylinder head
bolt
Cylinder head
Vacuum pump
assembly
