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Thread: Engine block rot?

  1. #1

    Engine block rot?

    Is it possible for there to be engine block rot? There’s a spot on the engine (clutch side) above the Id plate and below the frame joint where i found a layer of crud. When I tried to clean it, it felt soft and as I poked at it, it started to feel real soft. Is it possible that the engine block has a bit of rot? I assume not, but maybe a hole that was filled?



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  2. #2
    Liaison 20774's Avatar
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    I can't quite see the details. But the only thing black I can think of is either dirt that has gotten oiled up or possibly you're looking at the pushrod tube seals? Black "rot" doesn't come to my mind.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  3. #3
    Sorry, here’s a closer picture. It feels soft when I press on it.


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    Liaison 20774's Avatar
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    OK, can see it a bit better. Does it scrape off? Can you look at bits of it under a magnifying glass? Seems like it's just embedded road debris that has gotten more dirty and oily over time.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  5. #5
    Yup, will scrape it off and examine it. Hoping there isn't a hole or a crack there that was filled.

    Quote Originally Posted by 20774 View Post
    OK, can see it a bit better. Does it scrape off? Can you look at bits of it under a magnifying glass? Seems like it's just embedded road debris that has gotten more dirty and oily over time.

  6. #6
    Liaison 20774's Avatar
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    Awww, that'll buff right out!!
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  7. #7
    Day Dreaming ... happy wanderer's Avatar
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    Quote Originally Posted by armartel View Post
    Yup, will scrape it off and examine it. Hoping there isn't a hole or a crack there that was filled.
    _Highly_ unlikely in that area. I'm with Kurt here; try a good cleanup and see what's there.

    These engine cases are fairly thick and while surface corrosion on alumimun starts 5 seconds after it's machined it does not rot through. And if it does, in over 30 years of owning and working on them I have never seen it.
    MJM - BeeCeeBeemers Motorcycle Club Vancouver B.C.
    '81 R80G/S, '82 R100RS, '00 R1100RT

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