PC650-8 (140E-5) engine gear timing and valve adjustment teaching

Posted on:2021-03-13       View:72

Timing gear docking diagram

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Teaching Method of Adjusting Valve Clearance


                        Mark                     Part Number                   Part name
                          A                   Market purchase                 Feeler gauge 

I. Unload six-cylinder heads

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II. Turn the crankshaft forward and set the "1.6TOP" mark of the shock absorber


(a) Align with pointer ⑵ and adjust No. 1 cylinder to compression top dead center.


★ Rotate the crankshaft at the hexagonal part at the end of the water pump to drive the shaft.


★ When the No. 1 cylinder is at the top dead center of compression, you can manually move the rocker arm of the No. 1 cylinder to the gap of the air valve. If it cannot be moved, the crankshaft can be rotated for more than one revolution.

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III. Loosen the lock nut ⑷ when adjusting the screw (3).


★ After the No. 1 cylinder is set at the top dead center of compression, adjust the valve clearance of the No. 1 cylinder.


IIII. Insert the feeler gauge C into the gap between the rocker arm ⑸ and the crosshead ⑹, and use the adjusting screw ⑶ to adjust the air valve gap.


★ Insert the feeler gauge and set the adjusting screw to the point where you can move the feeler gauge slightly.


★ Air valve clearance, intake valve: 0.35mm, exhaust valve: 0.57mm


IIIII. When fixing the adjusting screw (3), tighten the locknut (4).


Nut: 45.1-51.0Nm {4.6-5.2kgm}.


★After tightening the lock nut, check the air valve gap again.

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IIIIII. After the No. 1 cylinder is adjusted, rotate the crankshaft forward 120°, and according to the point


Adjust the clearance of each cylinder in the fire sequence.


★ Ignition sequence: 1-5-3-6-2-4