MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
378
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Fig. 5-20-38 Installing the hydraulic clearance
adjuster
Fig. 5-20-39 Installing the exhaust/intake
camshaft
Fig. 5-20-40 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) by three steps according to the
specified sequence. See Fig. 5-20-37.
Tightening torque for cylinder head fastening bolt
Step 1
Step 2
Step 3
50N·
m±3N·
m
Turn it for 90°
Turn it for 120°
Attention:
Check the cylinder head bolt before
installation and replace it when there is any
deformation, elongation, pulled thread or other faults.
(3) Install the hydraulic clearance adjuster and rocker
arm
——Lubricate the ball head of the hydraulic clearance
adjuster with lubricating oil of proper amount.
——Insert the hydraulic clearance adjuster to the clip at
the rear end of the rocker arm as shown in Fig. 5-20-38
and ensure that the tappet will not drop 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 to the
bearing holes of the intake and exhaust camshafts of
cylinder head and the surface of the camshaft journal.
Mobil API CI-4 lubricating oil
——Install the intake and the exhaust camshaft into the
cylinder head. See Fig. 5-20-39.
——Align the marks ―
．
‖ on the driving gears of the
intake/exhaust camshaft to make these marks flush with
the upper plane.
Axial clearance of camshaft
0.060~0.115mm
(5) Install the camshaft bearing cap.
Lubrication
Hydraulic clearance
adjuster
Camshaft
Cylinder head
Camshaft
bearing
cap
Cylinder
head
