How to adjust the valves of Weichai P12?
1 Answers
You can start by counting from the rear of the engine: 1, 2, 3, 6, 7, 10, then rotate one turn to adjust 4, 5, 8, 9, 11, 12. The valve clearance is 40 for intake. The adjustment sequence is from the first cylinder to the sixth cylinder, adjusted in order. After adjusting the first cylinder, proceed to adjust the remaining ones. Below are the detailed steps for adjusting the valves of Weichai P12: 1. Rotate the engine to position the first cylinder piston at the top dead center of the firing position. 2. Adjust the intake valves of cylinders 1, 2, and 4. Loosen the intake valve lock nut and the intake valve adjustment bolt. Insert a 0.40mm feeler gauge between the valve bridge and the adjustment screw. 3. Rotate the adjustment screw to set the clearance to (0.40±0.06)mm, then tighten the lock nut using a torque wrench to a torque of (45±5) N·m. 4. Loosen the EVB bracket lock nut. 5. Rotate the EVB bracket adjustment screw to compress the small piston until it is fully depressed (be careful not to open the valve). 6. Insert a 0.60mm feeler gauge between the exhaust valve adjustment screw and the middle plane of the valve bridge. Adjust the exhaust valve clearance and lock screw to set the exhaust valve clearance to (0.60±0.06)mm. Tighten the adjustment nut to a torque of (45±5) N·m. 7. Finally, repeat the above steps to adjust the intake valve clearances of cylinders 3, 5, and 6, and the exhaust valve clearances of cylinders 2, 4, and 6.
