Need help on engine

Discussion in 'Mechanic and Repair' started by just_some_dude, Aug 3, 2010.

  1. just_some_dude

    just_some_dude LawnSite Member
    Posts: 20

    Hey. I'm just trying to figure out what's wrong with my engine. If you look in the pics you'll probably see what the issue is, but I don't know what it's called and what I should do to fix it. Could you help me out?

    Thanks!

    IMG_6239.jpg

    IMG_6236.jpg

    IMG_6237.jpg
     
  2. laman

    laman LawnSite Senior Member
    Posts: 335

    Put push rod back in place and set valves.
     
  3. just_some_dude

    just_some_dude LawnSite Member
    Posts: 20

    It popped back into place, then popped back out. It looks as though the screw is not screwed in enough. There is a couple thread difference between the two screws that attach to the push rods. I'm going to screw it in a bit.

    How do I set the valves?

    Thanks.
     
  4. just_some_dude

    just_some_dude LawnSite Member
    Posts: 20

    Is it common for one valve/valve spring to be lower than the other? I just took a peek again and the valve that, in this case, is disconnected is also not coming up as high as the other. At both of their highest points, the one that has the disconnected push rod sits lower than the one that is fine.
     
  5. laman

    laman LawnSite Senior Member
    Posts: 335

    Is something holding that valve open where it don't close?
     
  6. just_some_dude

    just_some_dude LawnSite Member
    Posts: 20

    I'm not sure yet if something is holding it open. It's the exhaust valve.

    Where do you think I should start to find out if something is holding it open?
     
  7. BigFish

    BigFish LawnSite Gold Member
    Posts: 3,157

    The freakin valve is bent or galled to the guide so ya gotta pull the head etc.
     
  8. topsites

    topsites LawnSite Fanatic
    Posts: 21,654

    Ok.

    That rod is called a push rod, at the very bottom of it through that little hole
    where you can't see is the camshaft where the other end of that there push rod
    rides on certain egg-shaped lobes that make it go up-and-down as the engine turns.

    This push rod pushes UP on a lifter, the thing that it keeps popping out from under is called a lifter.
    On the other end of that lifter is your valve.

    The first thing I would do pretty much regardless is after you figure out how to adjust it,
    is replace that push rod because if it even got the slightest bit of damage and you put it all back together
    it could end up tearing things up, probably not but they're not that expensive and better safe than sorry.

    Beyond that I have to leave it to the experts.
     
  9. just_some_dude

    just_some_dude LawnSite Member
    Posts: 20

    Thanks for the responses so far. They've been very helpful. Although the push rod doesn't look bent in any sort of way, I'll get another.

    I'm going to have to take the head off. My feeling, so far, is that the exhaust valve is stuck. I'm extremely curious to know why and if there's an easy fix.

    I've also read that spraying seafoam in there would help. I've also read that spraying seafoam in there would cause damage :).
    Posted via Mobile Device
     
  10. topsites

    topsites LawnSite Fanatic
    Posts: 21,654

    uhhh, I had a thought but doing a search on google revealed I was going too far, so I edited it.
     

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