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Thread: Careful with that gasket sealant!

  1. #1
    Registered User
    Join Date
    Mar 2011
    Bloomfield Hills MI

    Careful with that gasket sealant!

    You may recall I had a meltdown in my 1963 r69s. Both pistons melted, left worse than right.

    So, I have cleaned out the melted piston bits from the head, scraped off the melted piston from the valves (bench grinder was great for that- they just flaked off). Cleaned off the melted piston from the ouside of the valve guides (dremel tool with brass wire bush). Valves lapped, held gasoline in the chambers with no weeping, so I went to start to get the bike ready for the new pistons and bored cans.

    I went to clean the engine case, and pull off the old gasket. Here's a pic. There was so much sealant that it plugged the oil passages! Check out the top of the gasket- you can see the sealant oozed into the space and blocked it off. The bottom holes were likewise plugged. While I'm not happy with how this played out, at least this was not my handiwork!
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  2. #2
    Registered User weeman's Avatar
    Join Date
    Oct 2012
    Near Bellingham, Wa
    Some people have absolutely no business touching mechanical things. My aircraft mechanic father always reminded me of the pitfalls of too much sealant. Sorry for your demise.

  3. #3
    RD'nNH&AZ rdhudson's Avatar
    Join Date
    Apr 2012
    Summer in Lakes Region of NH and winter in the Sonoran Desert of AZ


    So much for splash oiling. On the pre 61? bikes the right cylinder has no oil passage and the splash can keep that cylinder oiled and cool enough although it may be marginal. Slinger cleaning on those bikes is an opportunity to drill an oil passage for that side with a special jig. I wonder if my '59 R60 has one? Gotta go in there some day.
    2002 F650GS, 1998 R1100R 75th anniversary edition, 1983 R80RT (just sold), 1959 R60 (in restoration), Honda CT90
    If you must make a mistake, make a new one each time.

  4. #4
    Liaison 20774's Avatar
    Join Date
    Sep 2005
    San Antonio, TX
    I think the right side oil passage showed up with the first /2 models. It's the early twins, '55-59, that don't have it. Here's a VMCA article about a special tool that has been developed to drill the passage. The tool is free to use by members of the VMCA.
    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!

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