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If you compression test your motor and find you have low compression you have one or more of the following problems; stuck valve, cracked head, warped head or blown head gasket. To correct any of these problems you are going to have to remove your head(s). Take it to an automotive machine shop to be inspected. They will tell you the problem and can fix them all except for a cracked head in wich case you will have to get another one. Note that if your cylinder head is cracked it will have compression until the motor warms up and will probably spray oil or coolant around in your engine compartment after it does.

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Q: What to do when compressions drops in engine?
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A good sentence for compression?

As a result of wear and tear there was no longer enough compression in the cylinder heads to keep the motor running.


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