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Thread: R75/6 Tachometer Cable Engine Housing

  1. #1
    Registered User b25bsaboy's Avatar
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    R75/6 Tachometer Cable Engine Housing

    Good afternoon,
    Inspected and removed my tachometer cable from it housing on the left side of the front of the engine. Really could not believe the amount of silicon used to seal it, as I have attached some pictures. My question is hopefully simple enough, in that looking at the parts book, there does not seem to be an o-ring or gasket used in the bottom cable housing to keep it oil tight, or have I missed something?
    Attached Images Attached Images
    Rick MacPherson
    Success is Not a Destination, But a Journey.
    Accredited Motorcycle Appraiser
    1968 BSA Starfire, 1976 BMW R75/6, 2009 R1200RT

  2. #2
    Registered User dmftoy1's Avatar
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    My r90/6 replacement cable had a plastic piece that filled that window, but no o-ring or seal. The plastic piece completely surrounded the metal end of the tach cable and just the bit that engaged the tach drive protruded.

    My understanding of the lack of seal/o-ring is that the idea is the cable is self lubricating from the oil vapors from the engine.

  3. #3
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    I don't recall an o ring. I just replaced mine 6 months ago or so ('75 R75/6). I have no idea why someone would have gooped that up the way they did. Unfortunately, I did not take any pictures of the cable coming out or going in.

  4. #4
    Administrator 20774's Avatar
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    Kurt -- Forum Administrator ---> 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
    Registered User b25bsaboy's Avatar
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    Quote Originally Posted by 20774 View Post
    Kurt,

    I think your right about the seal and will look at it once I have the flywheel back in place so that I can remove the from cover where the cable is located.
    Rick MacPherson
    Success is Not a Destination, But a Journey.
    Accredited Motorcycle Appraiser
    1968 BSA Starfire, 1976 BMW R75/6, 2009 R1200RT

  6. #6
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    I'd just run it. Probably some over zealous PO put it on there "just in case". My thought is if it was really leaking, that glob of silicone wouldn't change anything. Besides, it doesn't look like its ever been oily in there.

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