Mysterious valve guide problem

Discussion in 'Subaru Legacy' started by anton980, Aug 23, 2021.

  1. anton980

    anton980

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    Hello everyone. My 2012 Subaru Legacy (2.5i, non-turbo, 134,000 miles) got an issue. I am hoping someone can explain what could have caused it, because I am at a complete loss.

    A while ago, out of a blue, the engine started idling very rough, lost power, could barely accelerate. I ended up towing it back home. After a bunch of investigation, I realized there is zero compression in one of the cylinders. Not low compression, but 0.

    After removing the cylinder head assembly, I can see that one of the valves does not close all the way. When I removed it, I saw that the valve guide popped out (see attached image) and is preventing the valve from closing. The cylinder next to it has a similar issue (valve guide popped out), but not far enough to cause this problem. All other valve guides on that side of the engine look good. I did not remove the other head assembly.

    I am looking for a replacement left cylinder head assembly. In the meantime, I am wondering if anyone can suggest what could have caused this to happen. This car is my kid transporter, was maintained well, never abused.

    [​IMG]

    Thank you very much!
     
    anton980, Aug 23, 2021
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  2. anton980

    anton980

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    found a video that pretty much covers my situation:

    I'll have to figure out what lead to this and how to prevent it in the future....
     
    anton980, Aug 23, 2021
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  3. anton980

    Old timers

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    It's common drive out old 1 press in new we do it every day.
     
    Old timers, Aug 25, 2021
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