MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
142
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Fig. 4-2-14 Installing the exhaust/intake
camshaft assembly
Fig. 4-2-15 Installing the camshaft bearing
cap and applying sealant
Fig. 4-2-16 Installing the camshaft bearing
cap
camshaft bearing clearance
Standard
Limitation
0.025
～
0.085 mm
0.120 mm
Replace the cylinder head assembly if the camshaft
bearing clearance exceeds the limitation.
Reassembly
Reassembling
the
intake/exhaust
camshaft
assemblies
⑩
(1) Apply an appropriate amount of lubricating oil onto
the surface of the 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. 4-2-14.
(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
0.060
～
0.115 mm
Reassembling the camshaft bearing cap
⑨
(1) Apply anaerobic plane sealant to the junction
surface between the camshaft bearing cap and the
cylinder head. See Fig. 4-2-15.
LOCTTTE510 anaerobic plane sealant
Attention:
——The sealant on the junction surface between the
camshaft bearing cap and the cylinder head should be
cleared away properly if the former cylinder head is to
be used.
——The camshaft bearing cap bolts should not be
allowed for more than two times of removal and
reinstallation. If they have to, they should be replaced.
(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 specified order, then
tighten the surrounding 6 hexagon flange bolts (M6×20)
from the center to both sides. See Fig. 4-2-15.
Tightening torque for the bolt of camshaft bearing
cap
Camshaft
Cylinder head
Cylinder head
Camshaft
bearing cap
Apply
the
sealant
Cylinder head
Camshaft
bearing cap
