MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
128
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Fig. 4-1-25 Installing the hydraulic clearance
adjuster and rocker arm
Step 1
Step 2
Step 3
50 N·
m±3 N·
m
Turn for 90°
Turn further for 120°
Attention:
Check the cylinder head bolt before
installation and replace it when there is any deformation,
elongation, thread sliding or other faults.
Reinstalling the hydraulic clearance adjuster and
rocker arm
○
16
(1) Apply an appropriate amount of lubricating oil onto the
globular head of hydraulic clearance adjuster, then make
it engage into the clip at the rear end of the rocker arm.
See Fig. 4-1-25.
(2) Lubricate the surfaces of the rocker arm and the
hydraulic clearance adjuster with lubricating oil again,
and then insert the whole part into the corresponding
hole, with the other side of the rocker arm overlapping on
the valve. See Fig. 4-1-25.
Mobil APICI-4 lubricating oil
Fig. 4-1-26 Installing the exhaust/intake
camshaft
Fig. 4-1-27 Installing the camshaft bearing
cap and applying sealant
Reinstalling the intake and exhaust camshafts
○
15
(1) Apply an appropriate amount of lubricating oil onto the
surface of the camshaft journal and inside the bearing
holes of the intake and exhaust camshafts in the cylinder
head.
Mobil API CI-4 lubricating oil
(2) Fix the intake and exhaust camshafts into the cylinder
head as shown in Fig. 4-1-26.
(3) Align the marks ―·‖ on the driving gears of exhaust and
intake camshaft and get it in line with the upper surface.
Axial clearance of camshaft
Standard
0.060
～
0.115 mm
Reinstalling the camshaft bearing cap
○
14
(1) Apply anaerobic plane sealant to the junction surface
between the camshaft bearing cap and the cylinder head.
See Fig. 4-1-27.
LOCTTTE510 anaerobic plane sealant
Attention:
If the former cylinder head is to be used,
clean the junction surface between the camshaft bearing
cap and the cylinder cap before applying sealant. The
camshaft bearing cap and the cylinder head should be
used in sets.(2) To install the camshaft bearing cap,
screw down 16 hexagon flange bolts (M6×35) of
camshaft bearing cap to the specified torque and in the
Lubrication
Hydraulic clearance adjuster
Camshaft
Cylinder head
Camshaft
bearing cap
Apply the
sealant
Cylinder
head
