Method for Adjusting Valves in Xikang Engine
2 Answers
The methods for adjusting valves in a Xikang engine are the 'Double Row Not In' method and the 'Not In Double Row' method. Below are detailed introductions to these valve adjustment methods for the Xikang engine: 1. Double Row Not In Method: Position the first cylinder of the engine at the top dead center of compression for the first cylinder, where the intake and exhaust cams of the first cylinder do not press on the intake and exhaust valves. 2. Not In Double Row Method: Rotate the crankshaft to bring cylinder I to the top dead center of the compression stroke, then adjust all valves except those corresponding to cylinder I (cylinder VI) to the specified clearance. Next, rotate the crankshaft one full turn to bring cylinder VI to the top dead center of the compression stroke, and adjust the intake and exhaust valves of cylinder VI as well as any valves in cylinders II, III, IV, and V that have excessive clearance, setting their clearance to the specified value. At this point, the adjustment is complete. The process continues in a similar manner for other cylinders.
I've been driving trucks for many years and have to adjust the valves on the Xichai engine myself. Remember to let the engine cool down before starting, otherwise, burns could be a problem. First, use a wrench to rotate the crankshaft, positioning the first cylinder at the top dead center of the compression stroke—this is crucial. Take out the feeler gauge to check the valve clearance; the standard is about 0.3mm for intake and 0.4mm for exhaust when the engine is cold. If the gap is too large, loosen the nut and turn the adjusting screw to reduce it; if the gap is too small, adjust it in the opposite direction to increase it. Don't apply too much force, or the screw threads could strip, ruining the engine. After adjustment, tighten the nut and measure again to ensure it hasn't changed. Finally, adjust the valves of the other cylinders in order. Doing this regularly can save fuel, reduce noise, and extend the engine's lifespan. I do it every 50,000 kilometers, and the results are quite good.
