What is the minimum intake valve clearance for XinChai turbocharged engines?
2 Answers
The minimum intake valve clearance for XinChai turbocharged engines is 0.29mm. Turbocharger function: A device used in piston-type aircraft engines to increase the intake pressure of the cylinders. Before entering the engine cylinders, the air is compressed by the turbocharger to increase its density, allowing more air to fill the cylinders and thereby increasing engine power. Engines equipped with turbochargers can not only deliver greater takeoff power but also improve the engine's altitude performance. Turbocharger principle: The exhaust gas turbocharger utilizes the high-temperature exhaust gas (700-900 degrees Celsius) from the engine to drive the turbine in the turbocharger to rotate. The turbine shaft then drives the impeller in the compressor to rotate at high speed, compressing the air centrifugally and increasing the engine's intake density to 2-3 atmospheres. This allows more fuel to be injected into the engine, achieving the goal of increasing the engine's own power.
My new Weichai 4102 turbocharged engine just had its valve clearance adjusted. I remember the minimum intake valve clearance is 0.35mm. But honestly, requirements vary for each engine. My Weichai Power turbocharged diesel engine requires 0.30-0.35mm for intake and 0.40-0.45mm for exhaust when cold. You must use a feeler gauge for precise measurement when adjusting this - hot and cold engine data differ. Last time at the repair shop, I saw the mechanic first rock the piston to top dead center; just a 0.05mm difference in shim thickness makes the engine sound noticeably wrong. I recommend checking the original service manual or finding specific model parameters on the engine nameplate. Random adjustments might bend the valve stem.
