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  1. #1
    Lock and Load tron's Avatar
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    4-Tec Engine rebuilders look inside!

    Are all 4-tec bottom half cases the same? Like would one from an '02 GTX N/A work on my '08 RXT-X

    I recently had a main bearing spin and thrust bearing that got pretty chewed up after water ingestion (carbon seal failure). At this point of the tear down I can only see the bottom case side which is pretty gouged up and will have to be machined. What are my options as far as bearings? Can I get one with a larger O.D? Who / where is a good source?


  2. #2
    2006 Turbo RXP boBO's Avatar
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  3. #3

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    Typically the cases are machined as a set - Because the tolerances are so good today you might get by swapping out - maybe - maybe not. Bolt them together and check the bore for trueness and concentricy. Gouges don't necessariy mean bad. As long as you have a flat place for the bearing you can be ok. Good Luck

  4. #4
    ROTAX RACING performance
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    you have to use the block bottom and cylinder as a set !!!!, there is a number just behind the front enginemount that has to match ! if you use different bottom case, your next main bearing failure is comming for sure

  5. #5
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    Quote Originally Posted by mrracing View Post
    you have to use the block bottom and cylinder as a set !!!!, there is a number just behind the front enginemount that has to match ! if you use different bottom case, your next main bearing failure is comming for sure
    Mrracing is 100% correct.

  6. #6
    Lock and Load tron's Avatar
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    Thanks for the great info guys!!!! That being said where is a good place to start looking for some oversized bearings for these engines?

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