Valve clearence 274826 briggs&strattion engine

Clearances differ for the two valves and typically range from . 002 – . 004″ to . 005 – .

Valve Clearance Tips

Recommended valve-to-piston clearance is generally 0.080-inch minimum on the intake side and 0.100-inch minimum for the exhaust valve. The exhaust needs a little more clearance because it expands more with heat.

Check the clearance between the top rocker arm and the corresponding valve stem, located in the center of the valve spring, using a feeler gauge. If the clearance reading falls outside of the acceptable range of . 005- and . 007-inch, the top exhaust valve is out of adjustment.

When measured on a cold engine using a feeler gauge, valve lash for the Briggs LO206 engine should be . 003-. 004 inches on both the intake and exhaust exhaust side. As the engine heats up, this gap will open and you will get the max lift and duration.

A general rule of thumb is that intake guides need guide-to-stem clearance of . 001″ to . 003″ and exhaust guides need from . 002″ to .

Tappet clearance, also known as valve clearance, is the small gap between the rocker arm and the top of the valve stem (Yoke). Engineers can observe and adjust tappet clearance only when the valves are in a closed position and the engine is cooled at the compression stroke.

Too much clearance means the valves will likely clatter and, over the long term, cause damage to the valves, camshaft lobes or rocker arms. If there`s too little valve clearance, the valves won`t fully close, causing excessive heat, and the engine will lose power.

Rule of nine

With any given valve open, count what number valve that is from the front. Subtract that number from nine. Whatever number you`re left with is the valve you`re in position to set. So, with number 1 rocker opening its valve, you`ll be setting clearance on (9 minus 1), number 8 valve.

To adjust the valve clearance, slacken the locknut with a ring spanner and screw the ball in or out of the rocker a tiny amount, checking the clearance betwixt valve and rocker with feeler gauges. Once it`s correct, tighten the locknut and check again.