Weichai America Corp.
51
No.
name
No.
name
No.
name
1
Cylinder head
4
Rocker arm set
7
Rocker arm bracket
2
Valve bridge
5
Rocker arm shaft
3
Cylinder pin
6
Hexagon bolt
4.3.2 Pre-assembly Preparation
1.
Equipment condition: torque wrench, oil can, oil, small wrench
2.
Preparation: remove the cylinder head cover.
4.3.3 Disassembly steps of rocker arm and rocker shaft
1.
Turn the crankshaft and check if rocker arm rotates flexibly.
2.
Measure the valve clearance and check the change of valve clearance.
3.
If the rocker arm cannot rotate flexibly or the valve clearance changes greatly, loosen the
hexagon head bolt, remove the support frame, rocker shaft and intake/exhaust rocker arm
assembly, and mark them to avoid confusion of rocker arms of cylinders.
4.3.4 Assembly steps of rocker arm and rocker shaft
1.
Install the cylinder pin into the hole below rocker arm shaft, the pin should be fully in without
crack.
2.
Assemble the bracket and rocker arm set, apply little oil on the rocker arm shaft, , make sure it
rotate flexibly.
3.
Assemble the push rod and put the valve bridge.
4.
Assemble the rocker arm assembly.
Check and adjust intake/exhaust valve clearance:
1.
Carry out engine barring, and make 1# cylinder piston at TDC, i.e. the mark line on the
flywheel is aligned with that on the flywheel housing, and determine the 1# cylinder is at
compression TDC;
2.
Adjust the intake valve clearance of 1#, 2# and 4# cylinders and the exhaust valve clearance of
1#, 3# and 5# cylinders until the following requirements are met: Intake valve clearance: (0.38
±
0.03) mm; exhaust valve clearance: (0.58
±
0.03)mm; The tightening torque of
intake/exhaust valve adjusting nut is (45
±
5)Nm.
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