Briggs & Stratton
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Valve setting or clearance will be .004 inches on all valves.
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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.
Use a ring spanner to loosen the locknut and turn the screw clockwise to decrease the gap, and the opposite way to increase it. When the clearance is correct, hold the screw with a screwdriver while you tighten the locknut, then re-check the clearance. There may be a self-locking adjusting screw with no locknut.
What is a valve adjustment? The valve mechanism (push rod, lifter, and rocker arm assembly) is adjusted so that the lash has the proper clearance necessary to regulate the opening and closing of the valve. If the lash clearance is too great, it will affect the engine`s airflow and will eventually lead to valve damage.
This is the total volume remaining in the cylinder at the end of the piston stroke. This consists of the volume between the end of the piston and the cylinder head, in the valve ports and the volume in the suction valve guards and the discharge valve seats .
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.
With that said, the average cost of a valve adjustment is about $150 to $300, assuming no other work or parts are required.
To do that on a four-cylinder, eight-valve engine, use the rule of nine. Counting from the front of the engine if number eight valve is fully open, subtract eight from nine and the answer is one, so adjust the clearance on valve number one. If number six is closed, then adjust number three and so on.
The “Rule of Thirteen” is used to know which valve to adjust on a 6 cylinder engine. If valve #1 is open (when the adjuster side of the rocker is up, and the spring side is down) then which valve do you adjust to get to a total of thirteen? The answer is valve #12.
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.
To adjust the spool valve, loosen the valve-locking nut on the side. Removing the locking nut gives you access to the adjustment screw. Turn the screw clockwise to raise the pressure, and twist it counter-clockwise to lower the pressure.
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