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  1. #1
    kimi's Avatar
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    seadoo rxpx connecting rods berings problem

    Hi guys.

    I need your advices . Engine after rebuild- 15hours. And there's some problems with cilinder 1 and 3 rod berings. Cilinder 2 is perfect.
    I'm sending you some photos. I need your opinion about it.


    Best regards, Zanas.

    Click image for larger version. 

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  2. #2
    To much is never enough Badvgood's Avatar
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    What was your rod / crank clearance on rebuild 15 hours ago? Did you check the crank journals to see if they were mis-shaped? What oil was you using? Oil pressure readings?

  3. #3
    kimi's Avatar
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    Quote Originally Posted by Badvgood View Post
    What was your rod / crank clearance on rebuild 15 hours ago? Did you check the crank journals to see if they were mis-shaped? What oil was you using? Oil pressure readings?

    My mechanics rebuild this engine not my, he knows what is doing.I use Motul 15w50 double ester sintetic oil. Maebe this oil is my problem? I dont no what is oil pressure readings.

  4. #4
    shrabber's Avatar
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    I'm Only a Noob when It comes to these complicated 3 cylinders . The First thing You want to do is Measure Your Rod Journals to me it looks like there was to much clearance. Clearance, Worn Journal on Crank, Improperly streched Rod Bolts,Reused Rod Bolts, Defective Rod Cap, Rod Bearing Defective. If you look on the top half of the rod bearing you will see the heavy wear as into the clearance to where the journal and piston and rod's momentum come up and down. Just My Opinion I seen It Once Before Somewhere

  5. #5
    To much is never enough Badvgood's Avatar
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    I am thinking you have a bearing clearance issue. Using Rotax rods and stock shells I would guess on a standard crank journal without measuring the clearance and adjusting it.

  6. #6
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    This chart has been posted earlier. It will give u a good idea.
    http://catalog.mahleclevite.com/bearing/

    With Shrabber clearance off . Worth the time to learn how to measure clearances and buy or borrow a set of micrometers.

    go old school after u measure Plastiguage!!!!! http://www.plastigaugeusa.com/how.html

  7. #7
    hubiheu's Avatar
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    or your motor was detonating ............

  8. #8
    kimi's Avatar
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    Thanks guys for advise

  9. #9
    kimi's Avatar
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    Quote Originally Posted by hubiheu View Post
    or your motor was detonating ............

    no detonation, I use E-98 fuel in

  10. #10
    To much is never enough Badvgood's Avatar
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    Quote Originally Posted by kimi View Post
    Quote Originally Posted by hubiheu View Post
    or your motor was detonating ............

    no detonation, I use E-98 fuel in
    I don't think Hubiheu means detonating as in pre-detonation due to fuel / timing.

    I think he means in in the context of getting close to going BOOM and throwing a rod etc

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