How to adjust the four-valve 375 valve of Wei Chai engine

Valve clearance: intake valve 0.40, exhaust valve 0.60.

Adjustment method:

1. Turn the crank so that the piston of the first cylinder is at the top dead center position.

2. Adjust the intake valves of cylinders 1, 2 and 4, loosen the intake valve lock nut and the intake valve adjusting bolt, and then insert a 0.40mm feeler gauge between the valve bridge and the adjusting screw.

3. Turn the adjusting screw to adjust the clearance to (0.40±0.06)mm, and then tighten the lock nut with a torque wrench (45 5) n.m. ..

4. Loosen the EVB bracket lock nut.

5. Turn the adjusting screw of the EVB bracket so that the adjusting screw presses the small piston until it is completely compressed (be careful not to open the valve).

6. Insert a 0.60mm feeler gauge between the exhaust valve adjusting screw and the middle plane of the valve bridge, adjust the exhaust valve clearance and locking screw, and adjust the exhaust valve clearance to (0.60 0.06) mm ... and rotate. Tighten the adjusting nut with a torque of (45 5) N.m.

7. Finally, repeat the above steps and adjust the intake valve clearance of cylinders 3, 5 and 6 and the exhaust valve clearance of cylinders 2, 4 and 6 in turn.