[Pics] Anyone seen a spark plug do this?
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Anyone seen a spark plug do this?

  1. #1
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    Default Anyone seen a spark plug do this?

    It was in the #1 cylinder on a BBC 502.
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  3. #2
    Red Blooded American The Doctor's Avatar
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    Foreign material in the cylinder? I've seen chunks of carbon build up come loose and destroy a plug before. If you had insufficient fuel pressure at speed and it went lean, it will start eating itself up as well.
    The best things in life aren't things!

  4. #3
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    Quote Originally Posted by The Doctor View Post
    Foreign material in the cylinder? I've seen chunks of carbon build up come loose and destroy a plug before. If you had insufficient fuel pressure at speed and it went lean, it will start eating itself up as well.
    I have a borescope coming later this week. But I suspect the heads will or should be pulled regardless. I looked in the plug hole and there was an obstruction, so naturally I poked it with a screw driver and it fell in the cylinder. Could the plug have grounded to the head and I sheared the tip off when I wrenched it out? It took a lot of force to get it out.

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  6. #4
    Red Blooded American The Doctor's Avatar
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    I'll step back and let the professionals jump in but there's no way I'd try to run that before pulling the head(s) and having a closer look.
    The best things in life aren't things!

  7. #5
    Senior Member DuaneHTP's Avatar
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    The plug has been severely hammered. Pull the head and check out what all damage there is. If the top of the piston shows damage too, pull it and inspect the ring lands.

  8. #6
    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by Kyle1013 View Post
    I have a borescope coming later this week. But I suspect the heads will or should be pulled regardless. I looked in the plug hole and there was an obstruction, so naturally I poked it with a screw driver and it fell in the cylinder. Could the plug have grounded to the head and I sheared the tip off when I wrenched it out? It took a lot of force to get it out.
    Got a hunch that bore scope will reveal some carnage , pull the head (s) often times debris from a failure will trnsfer via the intke in final stages of failure

  9. #7
    Senior Member ol guy's Avatar
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    What heads and are you sure the plugs are right for the application. The shinny aluminum color on the plugs show piston and the reach on the plug shows to deep of a reach. Lean could also enter in here. MLAO . Mark

  10. #8
    Senior Member bville's Avatar
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    That looks like the time I dropped a valve.

  11. #9
    Senior Member Jetdream'n's Avatar
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    Quote Originally Posted by bville View Post
    That looks like the time I dropped a valve.
    X2 Something had to hit it. Valve drop or the piston came apart

  12. #10
    Senior Member LiquidDan's Avatar
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    No need to wait for the borescope...pull the head. How do you have the water inlets and outlets plumbed? Is the water flowing thru the heads front to back?
    Originally Posted by gn7 "Stick to making the worlds best engine stand."

  13. #11
    Member ezstriper's Avatar
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    badly wounded, pull it down now...piece of valve broke off I'm betting...not good

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