Weichai America Corp.
52
3.
Turn the flywheel for 360° to make the 6# cylinder at the compression TDC;
4.
Adjust the intake valve clearance of 6#, 5# and 3# cylinders and exhaust valve clearance of 6#,
4# and 2# cylinders clearance. valve clearance: (0.38
±
0.03) mm; exhaust valve clearance:
(0.58
±
0.03)mm;
5.
Check the valve timing of 1# cylinder in cold state; it is required that the intake valve is open
at
（
21
±
5
）°
before TDC and closed at
（
34
±
5
）°
after BDC; Exhaust valve is open at
（
49
±
5
）°
before BDC and closed
（
34
±
5
）°
after TDC.
4.3.5 Inspection and repair of rocker arm and rocker shaft
Key point 1:
Inspection
1) Clean the rocker arm and observe its surface for cracks or other defects.
2) Check the rocker arm inner bore for wear and scratches, and measure its diameter.
3) Check the ball pin and the arc surface at the other side of the rocker arm for wear.
4) Check if all oil passages are smooth.
5) Measure the diameter of rocker arm bore and rocker shaft, and calculate the fitting clearance.
6) Check the rocker arm shaft assembly for wear, check the bracket for crack and wear.
Key point 2:
Apply little oil on the rocker arm shaft, , make sure it rotate flexibly.
4.4
Disassembly and assembly of tappet and push rod
4.4.1 Exploded view of tappet and push rod assembly
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