Well, compression can also leak from the piston rings or valves. We do a "wet" test to check pressure difference on a cylinder with low compression. When a cylinder shows low compression on a dry test, and it increases with a wet test, it points towards worn piston rings. Also, a leak down test is a great way to check the rings AND the valves.
To perform a leak down test, you set the cylinder to TDC, so all the valves are closed, and inject compressed air into the cylinder. Then, you can hear if air is escaping from the tail pipe, intake or oil filler cap.
at this point, I would just change all the rings and send the head to a shop to see if anything is wrong.
To perform a leak down test, you set the cylinder to TDC, so all the valves are closed, and inject compressed air into the cylinder. Then, you can hear if air is escaping from the tail pipe, intake or oil filler cap.
at this point, I would just change all the rings and send the head to a shop to see if anything is wrong.
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