HOW TO: VALVE CLEARANCE ADJUSTMENT

Valve clearance adjustment is one of many maintenance needed by the engine to ensure that it is in good running condition. Incorrect adjustment may result to lack of air & fuel mixture to be supplied in each cylinder; or loose compression. Both intake and exhaust valves are adjusted to their specific clearance measurement depending on engine models and car manufacturer's specification.

There are two methods that can be used in valve clearance adjustment. The LONGER METHOD or per cylinder two valves to be adjusted every 180 degrees crankshaft turn. The other one is the SHORTER METHOD wherein you will position the no. 1 cylinder at Top Dead Center (TDC) compression stroke and then adjust four valves (depending on total number of valves of a certain engine model) at a time then rotate the crankshaft by 360 degrees and put the no.4 cylinder at TDC compression stroke then adjust the remaining four valves.

Below is a tutorial video that will help you understand easier how is it done

HOW TO: VALVE CLEARANCE ADJUSTMENT - FOUR CYLINDER ENGINES 8-VALVE