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  1. #1
    785xp's Avatar
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    Blown 2003 RXDI - Why?

    My friends RXDI blew the front piston and we are wondering why. Here are some pictures I took with my Blackberry. I have suggested he start taking it apart. Is there a link to an online manual for the DI? Any tips for taking it apart? Does he need to pinch the fuel lines?
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  2. #2

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    fuel starvation piston got real hot to melt like that, surprised he didn't hear it before it go that bad, ouch. I'd say his crank is toast as well with all that missing metal. look into the injectors to be working properly as well as the air injectors etc. check the air pump and it's hoses. Before he takes it apart I'd take it to a dealer and have them read the MPEM with the BUDS unit for any codes to help. maybe his fuel pump system and the 2 filters it has are clogged. Could be quite a few items. good luck guys

    TLR

  3. #3
    Work Harder, Millions on Wellfare Depend On Us! ultramaxracing05's Avatar
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    ouch, thats why i try to stay from the fuel injection, its efficient but what a pain in the ass. tips when rebuilding...clean block real good, i take mine and pressure wash the crap out of them for about 20 mins until i know there wont be any metal particles. but do this only when you are ready to put it back together and crank it soon, dont let it sit wet, it will rust.

  4. #4
    785xp's Avatar
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    I wasn't able to get pictures with my Blackberry, but when you look down the rave valve opening, you can see a chuck of piston ring missing and there is also a small chunk missing out of the piston. The local mechanic is suggesting the ring got caught.

    Is there an online manual for this ski? Will an engine out of a 2001 GTX Di work? I know that the first models of the DI's needed premium but wasn't sure if it is just a change in the computer or the engine as well.

    Also, this ski was in the shop not too long ago and the fuel system was tested with no problems.

  5. #5
    2Blue's BFF! dsolie's Avatar
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    My guess would be air injector seal failure.. Causing a massive lean condition and melting the exhaust side of the piston.. How does the rave paddle look?

  6. #6
    785xp's Avatar
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    The paddles are not damaged but the owner stated they looked rather oily since it wasn't that long ago that he cleaned them.

    I should mention this engine had about 200 hours on it.

  7. #7
    If i knew,...I wouldn't ask sea-one's Avatar
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    I have seen this before...if you notice the the piece missing isn't facing towards the intake or exhaust ports and all, that pitting is from that broken off piece, i'd say that its a leaking head gasket......


    dallas


    2 '04 RXP's no braggin,....they run

  8. #8
    785xp's Avatar
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    The biggest chunk that is missing out of the piston is facing the exhaust and you can see it clearly looking through the RAVE valve port. It is also just above a section of missing piston ring.

  9. #9
    If i knew,...I wouldn't ask sea-one's Avatar
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    oop's my bad.....you're right.i still think it might be the head gasket that caused it.

  10. #10
    2Blue's BFF! dsolie's Avatar
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    That's easy to check.. How's the head gasket look?

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