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Overheating destroying valve guides?

Discussion in 'The Garage' started by mountainexplorer, Jul 21, 2004.

  1. mountainexplorer

    mountainexplorer 1/2 ton status

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    I was just wondering if overheating a motor would have any part in the valve guides/seals going bad?

    This perfectly good running motor that I had just suddenly started going through oil horribly, and the only thing that happened to it was it got really hot once.
     
  2. smprider112

    smprider112 1/2 ton status

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    heat does warp metal...so its possible /forums/images/graemlins/thinking.gif
     
  3. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    [ QUOTE ]
    heat does warp metal...so its possible /forums/images/graemlins/thinking.gif

    [/ QUOTE ]

    It can also dry and crack seals........
     
  4. RustBuket

    RustBuket 1/2 ton status

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    Yeah, I was going to say that the oil seals are only rubber so its quite possible that that is what happened.
     
  5. diesel4me

    diesel4me 1 ton status Premium Member

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    It could be the valve stem seals,I kinda doubt the guides would wear out from heat alone--maybe if they were starved for oil--more likely is the piston rings got too hot and lost their spring tension,so they no longer seal well against the cylinder wall--hate to be the bearer of bad news,but it looks like a ring job is in your future,hope I'm wrong though!. /forums/images/graemlins/crazy.gif
     
  6. mouse

    mouse 1/2 ton status

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    I vote for valve seals ($16 last time I replaced some)...
     
  7. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    severe enough overheating can make a piston swell and grab the cylinder wall then when it cools down it shrinks smaller than its original size and can now make rings not seal properly. Seals are a pretty good guess that their bad from the heat if it was extreme enough. The only thing can could happen with the valve guides if it got really hot is that a valve could gall in the guide and then you have a sticking valve and will end up bent when a piston hits it because of it being held open when it should be closed.
     

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