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<p></p> <p><b>New page</b></p><div>===Compression test===<br /> <br /> &#039;&#039;&#039;Please Add Info, just click edit&#039;&#039;&#039;<br /> <br /> An engine is essentially a self-powered air pump, so it needs good compression to run efficiently, cleanly and to start easily.<br /> <br /> <br /> As a rule, most engines should have no more than 10% difference between any of the cylinders.<br /> <br /> <br /> Low compression in one cylinder usually indicates a bad exhaust valve. <br /> <br /> Low compression in two adjacent cylinders typically means you have a bad head gasket. <br /> <br /> Low compression in all cylinders would tell you the rings and cylinders are worn and the engine needs to be rebuilt. <br /> <br /> <br /> [[Category:Engine]]</div>

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