What is the adjustment method for four-cylinder valves?
2 Answers
The adjustment method for four-cylinder valves is as follows: After determining the position of a piston at the top dead center of compression based on the cylinder firing order, the intake and exhaust valve clearances of that cylinder can be adjusted. Once adjusted, rotate the crankshaft and gradually adjust the valve clearances of the other cylinders using the same method. Four-cylinder engines generally include models such as L3, L4, L5, and L6. The advantage of this layout lies in its compact size, high stability, good low-speed torque characteristics, and lower fuel consumption. Additionally, engines with an inline cylinder layout are more compact in size, allowing for more flexible arrangements and easier installation of supercharger-type devices.
Adjusting the valve clearance on a four-cylinder engine is actually quite important. I've encountered many similar issues during my years as a mechanic. First, make sure the engine is completely cooled down - measurements taken when hot will be inaccurate due to thermal expansion. Remove the valve cover and use a feeler gauge to measure the intake and exhaust valve clearances one by one. Generally, the clearance should be between 0.15 to 0.3 mm, but always check the manual for specific values. Excessive clearance will cause knocking noises and affect performance, while insufficient clearance may lead to burnt valves. When adjusting, loosen the lock nut and turn the adjusting screw, then tighten the nut after achieving proper measurement. Be patient throughout the process - rushing may cause mistakes. If you're not familiar with the procedure, it's better to visit a professional shop to avoid incorrect operations that could lead to bigger problems. Regular checks can extend engine life; it's recommended to inspect every 20,000 kilometers or so. For tools, a good set of feeler gauges, wrenches and a small mirror should suffice. Safety first!
