Bad Luck??
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Bad Luck??

  1. #1

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    Default Bad Luck??

    I have a 509 ford built for marine use Ross pistons eagle h-beams and svo alum heads. On the third trip out 3.5 hours on new engine it gave up a nice chunk of the #2 piston and ring. I pulled the head and found the gasket had pushed up approx 3/8" and appears to have let water into the clyinder causing the piston failure. Gaskets are fel-pro 1028 9/16 arp studs torqued to 140. The gaskets have vht copper coat and maybe gasgachinch? on them. Let the mach shop put this one together. No sign of heat bottom of piston looks new. Ran great did not go lean that I can tell. What could cause this???

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  3. #2
    Spiral out MikeF's Avatar
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    140#s.......damn.

    Sleeper could help you out more than me.

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    Senior Member hotbo's Avatar
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    can you post some pics of the piston and gaskets maybe?

    sorry for your bad luck

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  6. #4

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    Thanks trying to post some pics cant seem to will figure it out

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    140# with a alum head ? hmmm thats the spec on cast head but i thought it was 80# on alum. im not a ford guy but someone will chime in here soon.

  8. #6

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    the 140 torque came from stretch measuring by the mach shop.
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  9. #7

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    He also said heat makes the gaskets move..You can see how far they've gone and only 3.5 hrs on the motor. Don't think it got hot??

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    Senior Member Oldsquirt's Avatar
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    What do the undamaged cylinders look like?(pics?)

    What does the headgasket look like where it fits around the dowels?

  11. #9
    Senior Member Futs's Avatar
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    Quote Originally Posted by SquirtBoat View Post
    He also said heat makes the gaskets move..You can see how far they've gone and only 3.5 hrs on the motor. Don't think it got hot??
    Sounds like hes trying to get out of a rebuild.

    Alot of ferds bit the dust this year> ~~~~~ maybe it was the alighnment of the planets.....

    Sorry for your misfortune.

  12. #10
    Boat Nut sleekcrafter's Avatar
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    Gaskets do move around, my Aluminum heads had evidence of this. I was advised to use a Cometic type gasket, to stop the wear on the heads gasket surface. There looks to be evidence of the top ring, pulling the top of the piston off. Posible the ring end gap, was not enough for the cold block temps we have.
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  13. #11
    Spiral out MikeF's Avatar
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    Quote Originally Posted by Oldsquirt View Post
    What does the headgasket look like where it fits around the dowels?
    You don't need those thingys.

  14. #12
    gn7
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    I am going to take a shot at this one with one word
    Detonation!!!!



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  15. #13

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    All the other cylinders appear okay, to me. If you look at the first pic you can see where the gasket has pushed up around the studs seems okay around the dowels. The firing ring is egg shaped, I have never seen this why would this gasket move?? Seemed to be running on stoch, would twist an mpd stainless b 5800 @ 80+mph seemed to have more but was still going kinda easy on it...
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  16. #14
    gn7
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    I hear what your saying. But the only thing I can think of that can move a gasket like that and tear off a ring land ( both in the same engine) is detonation. The ring land could have been cause by a tight ring gap, and if the ring is in one piece you can check it. But to have both happen in the same motor at the same time. ?? This could have happened in less than 1 minute if you had it hammered. I took down a piston in the enduro last year in one lap, and every other cylinder was perfect. One restricted jet in one barrel on a 2X4 tunnel ram is all it took.



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