MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
358
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Fig. 5-19-34 Installing the cylinder cap
assembly
Fig. 5-19-35 Installing the hydraulic clearance
adjuster
Fig. 5-19-36 Installing the exhaust/intake
camshaft
Fig. 5-19-37 Installing the camshaft bearing
cap
Make sure that the cylinder head gasket is placed
correctly at all directions after the assembly.
(2) Install the cylinder head.
Fix the cylinder head to the cylinder body, and align the
10 screw holes, then fit and screw the 10 cylinder head
bolts (M11×1.5×162) according to specified sequences.
See Fig. 5-19-34.
Tightening torque of cylinder head fastening bolt
Step 1
Step 2
Step 3
50N·
m±3N·
m
Turn it for 90°
Turn it for 120°
Attention:
Before the installation, check the
cylinder head bolts for any distortion, extension or
thread slipping. If necessary, replace them.
(3) Install the hydraulic clearance adjuster and the
rocker arm
——Lubricate the ball head of the hydraulic clearance
adjuster with lubricating oil of proper amount.
——Fit the hydraulic clearance adjuster to the clip at the
rear end of the rocker arm, as shown in Fig. 5-19-35.
And make sure the tappet don’t fall off after installation.
——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.
Mobil API CI-4 lubricating oil
(4) Install the intake and exhaust camshafts
——Apply an appropriate amount of lubricating oil in the
bearing holes of intake and exhaust camshafts of
cylinder head and on the surface of the camshaft
bearing neck.
Mobil API CI-4 lubricating oil
——Install the intake and exhaust camshafts to the
cylinder head as shown in Fig. 5-19-36.
——Align the marks ―
．
‖ on the drive gears of the
intake/exhaust camshafts to make these marks flush
with the upper plane.
(5) Install the camshaft bearing cap.
——Coat the junction surface of the camshaft bearing
cap and the cylinder head with plane sealant.
Lubrication
Hydraulic clearance
adjuster
Camshaft
Cylinder head
Camshaft
bearing
cap
Cylinder
head
