In gasoline - powered lawn lawn mower locomotive engine , the head gasket , which separates the cylinder head from the locomotive engine block , is a governor of sorts . Not only does it prevent coolant and petroleum from meld ; it seal in the home combustion summons . If the head gasket ’s seals are weakened or if the gasket psyche has bluster , your lawn lawn mower will break down to operate at full powerfulness . To diagnose a blow head gasket , count for certain troubleshooting sign .

Low Power

Low locomotive power in a lawn mower can be make by wear and tear , deficiency of oil or regular maintenance , wear out - out seal or a blown head gasket . The only precise method to confirm suspicion of a swash gasket school principal is to impart a compression test .

Failed Compression Test

If the lawn mower has miss power or has an petroleum leakage around the headway gasket seal , a sure way to diagnose a blown gasket seal is through a densification test . Many automobile repair and small locomotive repair shops carry compression gauge , which measure out the inner burning pressure of the lawn mower engine . Before you start evaluate the intragroup pressure of the burning sleeping room , pull the starter corduroy several times . If the engine study at least 60 pounds per square inch ( pounds per square inch ) , then the condensation is within range . If the pressure is less than 60 psi , shoot a small railway locomotive oil into the twinkle plug hole so it coats the cylinders and pistons . quantify the pressure again . If there ’s no variety in the pressure , the lawn lawn mower plausibly has a blown gasket head .

Diminished Compression

The head gasket , a pre - thinned , steel crustal plate gobble between the cylinder head and the engine blockage , creates a vacuum sealskin in the engine ’s combustion bedchamber . If the head gasket is crack , if bolts are loose or missing or if any seals in the gasket are compromised , the combustion chamber can lose its vacuum cachet . When gasoline is combusted in the burning chamber , the vigor put out and sustained powers the pistons . If the head gasket has muff , pressure from the gasoline combustion will leak and wo n’t provide full power .

Oil Leak

To maintain normal compression levels in a lawn lawn mower locomotive engine , all lead gasket seal of approval must be in optimum contour . Over time , seals can dry out out and become brittle . Oil leak out around the head teacher gasket seals is sometimes a sign of a blown gasket . While a liquidity sealer may stop oil leaks , it ’s a temporary fix . Dried - out head basketful seals must be replaced to maintain optimal locomotive engine compression .

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