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  1. #1
    thompsdw's Avatar
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    Main Bearing Wear

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    I have the cases split to change the timing chain and found this wear pattern on one of the main bearings. I can actually feel a tiny ridge with my thumbnail. I assume these shouldn't go back in right? Less than 80 hours on this ski. It is a 2003 NA155 GTX.

    Several other bearings have worn through the coating and are polished, but none with ridges. Opinion???


  2. #2
    A smart admits!A wicked excuses!An idiot insists! mitsakosgt's Avatar
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    If I were you I change them with new ones.But first you must find out what caused this!!!I did a rebuilt on a running ski(cast to forged pistons only) and I replace them.Ski had 60 hours and run great!

  3. #3
    Water4fire's Avatar
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    does the crank show anything?

  4. #4
    thompsdw's Avatar
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    Quote Originally Posted by Water4fire View Post
    does the crank show anything?
    Very slight mark visible, but no ridge. I found a piece of tramp metal in one oil screen, but nothing else yet.

  5. #5
    formerly Gold06RXP Turbo Nick's Avatar
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    Its just from some metal particle that got between the bearing and the crank. Part of the bearings job is embedability. Its desigined to give and wear when needed if there is ever some debree in the oil so other parts will not get torn up like your crank. While alarming looking its normal to see things like this when disasembling an engine. Have your machine shop polish the crank, throw in a new set of bearings and go!!

  6. #6
    thompsdw's Avatar
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    I am going to change them. They are not that expensive. I wonder what else I should pull apart now? Oil pumps and oil pressure regulator????!

  7. #7
    ou812's Avatar
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    You're going to be in there anyway so you might as well go through everything. It's not that hard really.

  8. #8
    thompsdw's Avatar
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    Yea, I'm thinking the same thing. Is there any negative to reusing the oil pressure regulator parts?

  9. #9
    richrxp's Avatar
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    Quote Originally Posted by thompsdw View Post
    Yea, I'm thinking the same thing. Is there any negative to reusing the oil pressure regulator parts?
    If they have no wear marks or damage you can reuse them.
    Mine was stuck,some small metal parts caused this,ordered a new piston and sleeve.( and other parts to completely rebuild my engine)
    Make sure not to over torque the bolt, otherwise you will have problems.

  10. #10
    West Texas RXP skoepp's Avatar
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    Quote Originally Posted by thompsdw View Post
    Yea, I'm thinking the same thing. Is there any negative to reusing the oil pressure regulator parts?
    Its all right there to disassemble very easy.
    The oil gears can be reused if there within wear limit.
    If you were building a high rpm big boost motor I would recomend most parts to be replaced with 100 + hours

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