Chapter V GW4D20 / GW4D20B Turbocharged Diesel Engine
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
279
Fig. 5-9-17 Installing the vacuum pump
assembly
Installing the vacuum pump assembly
○
13
(1) Install the vacuum pump at the rear end of the
cylinder head exhaust camshaft.
(2) Remove the 2 hexagon flange face bolts (M6×20)
connecting the vacuum pump and cylinder head flange.
See Fig. 5-9-17.
There should be no deflection or misplacement after
installation.
Tightening torque for vacuum pump fastening bolt
9N·
m±3N·
m
Fig. 5-9-18 Installing the cylinder head gasket
Fig. 5-9-19 Installing the cylinder head and
tightening the bolts in order
Installing the cylinder head assembly
○
12
(1) Check for foreign materials on the joint surface of
the cylinder head and the cylinder body, and clean it
with silk.
(2) Insert the cylinder head dowel pin sleeve into the
corresponding pin holes on the cylinder body with a
special tool, and make sure they are properly
assembled; fit the fixing hole sleeve for cylinder head
gasket to the dowel pin of the cylinder body, and evenly
place the gasket to the cylinder body plane. See Fig.
5-9-18
Make sure the cylinder head gasket is in the right
direction after installation.
(3) Fix the cylinder head to the cylinder body, align the
10 screw holes, and then fit and screw the 10 cylinder
head bolts (M11×1.5×162) according to specified
sequences and torques in three steps. See Fig. 5-9-19.
Tightening torque for cylinder head fastening bolt
Step 1
Step 2
Step 3
50N·
m±3N·
m
Turn it for 90°
Turn it for
another 120°
Attention:
Before the installation, check the
cylinder head bolts for any distortion, extension or
thread slipping. If necessary, replace them.
Cylinder head
Vacuum pump
assembly
Cylinder head
Cylinder head
bolt
Cylinder body
Cylinder head
gasket
