MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
172
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Fig. 4-4-40 Installing the cylinder head
assembly and tightening the bolts in proper
order
Fig. 4-4-41 Installing the hydraulic clearance
adjuster
Fig. 4-4-42 Installing the exhaust/intake
camshaft
(3) Fix the cylinder head to the cylinder body, and align
10 cylinder head bolts with the 10 screw holes, then fit
and screw these bolts (M11×1.5×162) in three steps
orderly. See Fig. 4-4-40.
Tightening torque for cylinder head fastening bolt
Step 1
Step 2
Step 3
25 N·
m±3 N·
m
Turning for 90°
Turning for
90°±5°
(4) Reinstalling the hydraulic adjuster and rocker arm
——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, as shown in Fig. 4-4-41. Make sure it would not fall
out.
——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. 4-4-41.
Mobil API CI-4 lubricating oil
(5) Reinstalling the intake and exhaust camshafts
——Apply an appropriate amount of lubricating oil to 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
——Install the intake and exhaust camshafts into the
cylinder head as shown in Fig. 4-4-42.
——Align the marks ―·‖ on the driving gears of the intake
and exhaust camshafts and get it in line with the upper
surface.
Axial clearance of camshaft
Standard
0.060~0.0115 mm
(6) Reinstalling the camshaft bearing cap
——Coat the junction surface between the camshaft
bearing cap and the cylinder head with anaerobic plane
sealant.
LOCTITE510 anaerobic plane sealant.
Cylinder
head bolt
Cylinder head
Lubrication
Hydraulic clearance
adjuster
Camshaft
Cylinder head
