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  1. #1
    thompsdw's Avatar
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    Wear Pattern on Back Side of Rod Bearings

    2003 GTX 155. Less than 100 hours, but quite a few years. Front side of bearing looks normal, I am changing all bearings - but just want to make sure I don't need to do anything else. Cannot feel anything in the way of grooves or scratches on the rods ...
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  2. #2
    thompsdw's Avatar
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    Ya know, it almost looks like oil degraded behind the rod bearings. But, I can't explain the streaks. After finding some oil sludge in the bottom of the case, I can't help but think that I had an oil issue of some sort. I don't see any evidence that they spun (metal damage, etc), but I must say I haven't seen many spun bearings.

  3. #3
    dnielsen's Avatar
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    Spun bearing, better check the crank and rods real good! Looks like to me that the bearing at least slipped at some point. No oil, low oil pressure, over heat......something caused it to move. Flip them over and post up some more pics along with some good pics of each end of the bearing.

  4. #4
    thompsdw's Avatar
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    Boy, everything else looks normal. Crank is perfectly clean. Wouldn't I see something else? Btw - the back side of EVERY rod bearing looks like this.

  5. #5
    dnielsen's Avatar
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    WOW, after looking at those pics it doesnt appear as if the bearings moved at all.....hmmmm. WTF?

  6. #6
    thompsdw's Avatar
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    I know, that is why I posted here. It is definitely a weird pattern. I guess I am going to slap new bearings on and run!

  7. #7
    dnielsen's Avatar
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    Be sure to check the service limits on the crank before proceeding with the build.

  8. #8
    That discoloration on the back of the bearing shells is just broken-down oil deposits, likely from cheap/bad oil. Nothing to worry about, but you need to clean out the engine good and use good oil from now on.

  9. #9
    thompsdw's Avatar
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    I have been using that Casterol GTX 10W-40 for years on my NA engines. I guess thats not good enough. I will do some research here on oil for NA engines ...

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