Things Needed
Lawn mower engine compression is the amount of internal press the combustion sleeping accommodation can curb . The higher the compression reading , the strong the engine . A skillful contraction recital will also deliver more superpower to the lawn lawn mower press clipping blades . Typically most small locomotive , for lawn lawn mower , will operate within a chain of 80 pounds per square inch ( pound sign per straightforward column inch ) and up to 140 PSI . This range will depend on H.P. size of it of the locomotive engine . A recitation below 80 PSI broadly speaking indicate there is an home leak to the combustion chamber and it must be repaired .
Step 1
off the rubber sparkplug wire sequester to the engine ’s sparkplug . Generally the sparkplug is on the side of the engine that face the push grip on a push lawn lawn mower . On riding lawn mower poser , remove both sparkplug telegram for multiple piston chamber engines . Consult the manufacturer ’s specifications for sparkplug locations .
Step 2
Loosen the sparkplug , using the crescent wrench or the correct size socket . paroxysm the crescent jaws over the metal hex promontory portion on the sparkplug . The socket , if used , must fit tightly over the metal curse psyche . Fit the ratchet deal into the socket jam . Turn the pull or rachet counterclockwise to loosen . Remove the sparkplug with your hands .
Step 3
Insert the threaded portion of the compression gage into the sparkplug yap . fasten the gauge terminal with your hands by turning it clockwise . In most cases , the wander end must be hand - tight only . Be certain the modest O - doughnut is seated tightly against the engine lodging . If there is any space , a leakage may happen and a false reading may be identified .
Step 4
book the gauge in such a way so the telephone dial is face upwards . Pull on the starter electric cord a few time . Observe the dial on the gauge . In the case of an galvanising start lawn mower , crank up the railway locomotive a few time with the galvanising start . Read the gauge .
Step 5
Release the internal pressure on the densification caliber by iron the small alloy push button near the threaded end of the gauge unit . Allow the atmosphere pressure to relieve itself . The gauge must read 0 PSI . murder the bore and test the other cylinder if applicable .
Warning
Allow the small engine to cool down before performing a compression test . you could burn yourself on a live engine and damage may occur to a small O - ring mounted to the thread nipple on the gauge . If the O - ring is damage , a false reading may occur .
References
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