Chpter IV Mechanical System
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
125
Fig. 4-1-16 Removing the hydraulic
clearance adjuster and rocker arm
Fig. 4-1-17 Removing the tightening bolts of
cylinder head in order
Fig. 4-1-18 Checking the cylinder head and
its gasket
Disassembling the hydraulic clearance adjuster
○
16
(1) Take the 16 pair of hydraulic clearance adjusters and
rocker arms respectively out from the corresponding
holes in the cylinder head. See Fig. 4-1-16.
(2) Mark the removed hydraulic clearance adjusters and
rocker arms in cylinder groups to facilitate the
reassembling in their original sequence.
Disassembling the cylinder head
○
17
Caution:
The cylinder head should not be removed
during warm-up, which may cause deformation.
(1) Gradually and evenly loosen the 10 bolts of the
cylinder head in the order shown in Fig. 4-1-17.
Caution:
If the cylinder cap bolts are not orderly
loosened in gradually specified order, the lower surface
of the cylinder cap might be damaged.
(2) Take down the cylinder head and cylinder head
gasket from the cylinder body.
Check the cylinder head gasket and replace it if
there is any damage, deformation or lost elasticity.
(3) Remove the valves and valve springs.
Cleaning
(1) Cylinder head bolt.
(2) Cylinder head.
Attention:
Carefully clean all greasy dirt, soot and
carbon depositions until the original mental color is
revealed. Never apply electric wire brush on any sealing
surface or sealing gasket.
Inspection and repair
The parts should be adjusted, repaired or replaced if any
excessive worn or damage is detected during inspection.
(1) Check whether there is any leakage, rust or blow-by
on the cylinder sealing gasket and fitting surfaces. If a
sealing gasket failed, the failure reason should be
determined.
——Incorrect installation.
——Looseness or warp.
——Insufficient tightening torque for cylinder head bolt.
——Warped surface of cylinder body.
(2) Check whether there is any damage or elongation of
Cylinder head
bolt
Cylinder head
Cylinder body
Cylinder head
gasket
