Mitsubishi Repair: Lost compresion, valve seals, head gasket
QuestionThe car has lost compression in 3 cylinders(2,3,4). Cylinder1 has 65psi, the cam timing marks line up. I did not check the crank mark. The engine was rebuilt at 116k at a local Oregon shop with lower (9.1:1) compression forged pistons with eagle rods. what do you think could have happened.
AnswerShawn,
You may have a cracked ring, warped head gasket, or worn valve seals or guides. A compression test is good to find the general area your engine has lost compression. A more precise procedure is called a leakdown test. There is quite a bit of information on the internet regarding this procedure and the tools necessary to perform it. Poor compression can be brought on by a number of things. Any time non-stock parts are put into an engine to change the compression ratio, that increase the number of possibilities for a cause. Either way, you'll want to pinpoint where the problem is to save you time and money in parts and labor.
Good luck!