Q:

What are some known problems of used Mitsubishi engines?

A:

Quick Answer

One notable problem with used Mitsubishi engines is an issue called "crankwalk." Crankwalk occurs when the crankshaft endplay, or the distance the crankshaft moves from side-to-side, increases to the point that it destroys the engine. The engines most likely to be affected by this issue are the 1995 to 1997 seven-bolt 4G63 engines.

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Full Answer

If you are considering purchasing a used 4G63, it's worth looking to a six-bolt engine produced between 1991 and 1994. While this engine is older than the seven-bolt, it is mostly unaffected by crankwalk. If you are set on a seven-bolt, be on the lookout for signs of crankwalk. If the engine is still in the car, pay close attention to how it shifts. One of the early signs of crankwalk is difficulty shifting and/or inconsistent clutch engagement.

If the engine is out of the car, check -- or have a professional check -- the crankshaft endplay to ensure it is in tolerance before purchasing the engine. Crankwalk is a somewhat mysterious issue. Some owners never see it despite heavily modifying their engines, while some get it on stock versions. Mitsubishi has steadfastly refused to issue any compensation for or even acknowledge the crankwalk issue as of 2015, and there is no sure fix for the issue.

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