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  1. #1
    CB750 New Member DDCCWW's Avatar
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    99 Nighthawk Countershaft seal Replacement

    No experience with this issue here...bye.

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    Pls delete.
    Last edited by DDCCWW; 07-07-2015 at 07:12 PM.

  2. #2
    CB750 Member no0bi1's Avatar
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    gonna tackle this soon any tips tricks fellas do i need 'hondabond'

  3. #3
    CB750 Guru amc49's Avatar
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    There is a countershaft bearing cover that removes under the outer case cover. Likely need the gasket there for spacing of bearing.

  4. #4
    CB750 Member no0bi1's Avatar
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    not gonna mess with the bearing just the outer seal #11

    you are talking about #12?

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  5. #5
    CB750 Guru amc49's Avatar
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    Yes.

    If you think you can get seal out without yanking cover fine but a lot of butchery begins that way. I'd look at the seal. Honda sometimes makes one part of the OD bigger to either go in a certain way or to have to split cases to get seal in. No splitting there but I'd make sure the seal did not have a stepped OD. Then you can go ahead with trying to pull seal only.

    Honda also commonly uses the back of that seal to hold oil pressure for that bearing on other engine designs and it can leak VERY easy as a result of that, has to be installed perfectly.

  6. #6
    CB750 Member no0bi1's Avatar
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    I see you say the cases have to be split on the DOHC engines on the other threads for this issue

    http://www.cb750.com/threads/3800-19...al-Replacement

    http://www.cb750.com/threads/4150-Co...t=Countershaft

    The part number for the outer Counter shaft seal DOHC is 91206-MJ0-005

    It does have a lip on inner diameter but it is pretty soft and I feel like it would slide onto the counter shaft Groove if i punched it in with a big socket

    Please advise

  7. #7
    CB750 Guru amc49's Avatar
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    Any lip forcing cases to split is on the OD not ID, and different design engine anyway. A normal seal has both an inside and outside lip in the inner diameter.

    I'd remove that cover if mine simply to make sure of getting the seal in right. Putting them in not so much a problem, it's removing them. If you so much as scratch the OD aluminum bore or the inner spacer/distance collar the seal seals on you have leaks. If the distance collar has a wear groove from dirt riding there all the time you will already have a problem, the collar then needs to change too. A socket will work as install tool but I've seen plenty of people use the wrong size to wreck the seal instantly. The socket MUST be over the outer wall (OD), not deeper into the seal (between the OD and ID is death, the seal bends like tinfoil there).

    Having changed literally a thousand seals on different things I for one can get the seal out without yanking the cover but your skills there not mine. No insult intended at all there. If you think you can do it then go for it, I do not know how good you are.

    Clean the outside off good first, you are breaking into an oil reservoir there and any trash you put in the pocket has to go through bearing to get out. Another possible reason to yank the whole cover.

    Luck...........

  8. #8
    CB750 Member no0bi1's Avatar
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    bleh it ended up being the neutral switch... the front sprocket gets so dirty you think its leaking...

  9. #9
    CB750 Guru amc49's Avatar
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    We understand.............been there many times myself.

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