Oil Leak Back of Crankcase - Page 3
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Thread: Oil Leak Back of Crankcase

  1. #21
    Supporting Member Yendor's Avatar
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    Don't you have a do it yourself car wash somewhere near you?

    Ride over - Take a can of Foaming Engine Cleaner with you.
    Spray down the lower cases of the motor.
    Then pressure wash off the foam.

    That will clean everything up.
    The heat from a running motor will dry up the water quickly along with a little air flow from a mile or so ride.
    If the oil leak is staring to come back you should be able to dust it with the baby powder and find it quickly.

    Brake Cleaner will not penetrate between the space where a gasket is compressed and sealing unless you WAY - WAY over do it and allow it to sit for way too long.
    1970 CB 350 CAFE - Current Project on the bench,
    1972 CB 350 K4 Red - Now a Happy Rider ! !
    1972 CB 350 K4 Green (My Sons) DONE - YES !,
    1st Bike 1970 SL 350 (Brought home in Parts - Trailer/Trunk/Back Seat - I miss that bike),
    2nd - Bike Kawasaki 750
    3rd - '73 XLCH 1000

  2. #22
    Senior Member thats_incentive's Avatar
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    Oil Leak Back of Crankcase-img_5869.jpg
    1971 CB350k3

  3. #23
    Senior Member thats_incentive's Avatar
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    You'll have to crank up the brightness but in left center frame its at the case halves near the corner behind the chain. I unfortunately watched that dark patch slowly spread.
    Last edited by thats_incentive; 09-12-2019 at 11:56 AM.
    1971 CB350k3

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  5. #24
    Senior Member doode's Avatar
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    Good detective work.
    I am not certain there is a way to patch this.
    Maybe clean it really well and try ???
    Seal all, rtv black, hondabond, epoxy ???

  6. #25
    Supporting Member Yendor's Avatar
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    If it is between the Case halves it is most likely a gouge in the surface that the Honda Bond was not able to bridge over and seal or a spot where you missed spreadin the Honda Bond onto.
    1970 CB 350 CAFE - Current Project on the bench,
    1972 CB 350 K4 Red - Now a Happy Rider ! !
    1972 CB 350 K4 Green (My Sons) DONE - YES !,
    1st Bike 1970 SL 350 (Brought home in Parts - Trailer/Trunk/Back Seat - I miss that bike),
    2nd - Bike Kawasaki 750
    3rd - '73 XLCH 1000

  7. #26
    Senior Member thats_incentive's Avatar
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    Got another one on the right side, up by the tacho cover or exhaust tappet cover or something.

    Am I missing something here? Oil is on the lower side of the dipstick so don't think I'm overfilling. I do need an oil change. Idk what else or does this just tend to happen?

    Thanks
    1971 CB350k3

  8. #27
    Senior Member thats_incentive's Avatar
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    Please, I implore you. What the heck is going on anyone want to weigh in? Opinions, facts, speculation, any and all is embraced. I am alone and in the dark, kinda why I come here, so if anyone wants to type out a sentence or two of their immediate thoughts, that would be just awesome.

    And yes, I will be posting pics for you but think kinda like the last one, theres really no point, typical oil leak, just they're all happening back to back...

    Sound familiar to someone? Anyone?
    Last edited by thats_incentive; Yesterday at 11:59 PM.
    1971 CB350k3

  9. #28
    Sensei 66Sprint's Avatar
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    Please phone me anytime to discuss these problems..........Unfortunately, the best solution will be to disassemble the leaking areas, figure out WHY they are leaking, cure that, and then reseal them......New gaskets may be necessary, and are recommended regardless as are new seals and O-rings if appropriate........

    IF it were my bike, that engine would already be drained of oil, out of the frame, and on my workbench.......
    NOT what you wanted to hear, I know, but it is where you are currently.........

    Typically, if assembled correctly, these engines are oil tight and don't leak a drop........
    Last edited by 66Sprint; Today at 06:16 AM.
    "I have a mind like a steel trap.....Old and rusty, of antiquated design, and hard to get stuff back out of...."
    Contact info: E-mail; [email protected] Phone; 540-525-5199

  10. #29
    Senior Member doode's Avatar
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    Take Steve up on his offer

    And, I'm a bit different. I'll drive my bikes til the leaks get really bad and keep an eye on the oil level

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