Chpter IV Mechanical System
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
127
Fig. 4-1-22 Installing the valve
Fig. 4-1-23 Installing the valve spring and
valve lock clamp
Fig. 4-1-24 Installing the cylinder head,
tightening the bolts in order
——After the installation, the valve stem should be able
to move flexibly inside the valve guide without seizure.
(2) Installing valve spring gasket
(3) Installing valve oil seal assembly
——Apply a little lubricating oil onto the sealing face of
the valve oil seal.
Mobil API CI-4 lubricating oil.
——Press the valve oil seal into the valve guide head
with special tools.
Valve oil seal installer: 5-8840-2033-0
——Carry out an air pressure leakage test on valve oil
seal.
Air pressure specification: under an air pressure of 50
～
70 kPa, the blow-by flow should not excess 20 mL/min.
(4) Installing the valve spring
——Mount the valve spring onto the valve spring gasket.
——The valve spring should come into contact with, but
not seized on, the base plane of the retaining column of
the valve spring seat.
(5) Installing the valve lock clamp
——Compress the valve spring with special tools to
install the valve lock camp into the valve spring seat.
Valve spring compressor: 9-8523-1423-0
——The valve lock clamp should be in tight contact with
the annular pressure-bearing surface of the taper surface
of valve stem end, and the external conical surface of the
valve lock clamp should be in tight contact with the
internal conical surface of the valve spring seat. The two
pieces of lock clamps should be aligned. After the
installation, use a hammer to tap on the head of the valve
to make sure the valve lock clamps will not pop up.
(6) Check whether there is any foreign matters on the
junction surface between the cylinder head and cylinder
body, if there is, clean it up with silk; fit the locating hole
of the cylinder head gasket onto the cylinder body fixed
pin, and keep the gasket flat on the cylinder body upper
plane.
(7) 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. 4-1-24.
Tightening torque for cylinder head fastening bolt
Exhaust
valve
Inlet
valve
Valve lock clamp
Valve spring seat
Valve spring
Cylinder head
bolt
Cylinder head
