Compression tester adaptors- paul-ryan.info Short-reach plug Long-reach plug Adaptor for long-reachplug hole.
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Plugs may have a long reach or a short reach, the length of the thread from the plug body to the nose. A tester with a screw connector has an adaptor which should be fitted when inserting the connector into the socket of a long-reach plug.

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Cylinder compression test

A good way to check engine wear is to test the compression of each cylinder using a compression ...