What is the method for valve adjustment?

[MacHenry]

According to the cylinder firing order, after determining that a certain cylinder's piston is at the top dead center of compression, the intake and exhaust valve clearances of this cylinder can be adjusted. After completing the adjustment, rotate the crankshaft and gradually adjust the valve clearances of the other cylinders using this method.

[EloiseDella]

When repairing cars, I often encounter owners asking about valve adjustment. Simply put, first let the engine cool down, locate the top dead center mark on the crankshaft pulley, and remove the valve cover. Insert a feeler gauge between the valve stem and rocker arm; the standard clearance is generally around 0.15-0.25 mm. If it's too loose, the engine will make a ticking noise; if it's too tight, there will be insufficient power and valve burning. Loosen the adjustment nut with a wrench, turn the adjusting screw while moving the feeler gauge, and tighten the nut when you feel slight resistance. Older cars usually require a full adjustment, while some newer cars with hydraulic lifters can compensate automatically. After adjustment, remember to idle the engine for a few minutes to check if the sound is even. I've seen beginners not follow the firing order, resulting in the engine shaking like it's dancing.