306s16 gearbox still leaking
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  1. #1
    Tadpole
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    Default 306s16 gearbox still leaking

    The bad news is back from the mechanic says may be the seal/gasket on the bell housing or worse,will not know until it is apart. History is a new clutch less than 12months ago with subsequent drive shaft seals to try and fix leaks. Looks like required repairs will be big $ for labour. Is loosing a fair amount of oil and has been topped up by the mechanic again. Can anyone advise if I can use a stop leak product to stem the leak for now until I get the cash for repairs. Nulon's Stop leak product suggests it can be used for gearboxes as well.

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  2. #2
    Fellow Frogger!
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    I'm confused.

    - For starters the bell housing has no seal and contains no oil only a clutch assy
    - Is it gearbox oil or engine oil leaking

    - Gearbox oil will only ever leak from driveshaft seals or input shaft seal - anywhere else means the gbox has been apart and not resealed properly
    - With respect to engine oil around the bell housing, could be rear main seal, sump, distributor or rocker cover gasket.

    A clutch replacement 12m ago shouldn't require the gbox to be apart and it probably should have had the rear main seal replaced.

    Nulon stop leak in your gear box won't fix your oil loss if its coming from the rear main.

  3. #3
    1000+ Posts PeterT's Avatar
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    It's easy to damage the driveshafts seals when removing/installing driveshafts, as would have happened during the clutch change process. Is it possible you've smashed them twice?

    I'd be pulling out the driveshafts again, removing the speedo drive casing, and have a good inspection around that area. It's not a big job like the mechanic is making out.

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  4. #4
    Tadpole
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    My mistake, is apparently an oil leak at the gear box input seal. Gearbox oil was pretty low. Is this still a big job? Mechanics comment was that could turn out to be more and will not know until he gets the thing apart. Does 4 hours seem reasonable as a start? Would you use a stop leak product as a short term fix?

  5. #5
    1000+ Posts cav91's Avatar
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    Is that 4 hours to remove and refit the gearbox? That's a decent effort!! If I could do that my mi16 wouldn't be crunching going into third!
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  6. #6
    Fellow Frogger!
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    Can easily remove and refit the gearbox in 4hrs, but not fix the leak (or do any required work too) in that time as well.

    Then again, I've had a few pugs in the past so I was never out of practice !!

  7. #7
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    Quote Originally Posted by Proudys306 View Post
    My mistake, is apparently an oil leak at the gear box input seal. Gearbox oil was pretty low. Is this still a big job? Mechanics comment was that could turn out to be more and will not know until he gets the thing apart. Does 4 hours seem reasonable as a start? Would you use a stop leak product as a short term fix?

    Replacing the said seal, requires the g.box to come off so a fair bit of work is involved unfortunately.

    I suggest having the main seal behing the flywheel replaced too while the gearbox is out. It will add another hour of labour, but ensures you dont go through the whole process again.

  8. #8
    Fellow Frogger!
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    Input shaft seal is quite simple to replace and can be easily done in a generous hour.

    When the mechanic said 'could be more' he's covering his ass incase the input shaft is scored or there is a hole in the bellhousing from blown spider gears.

  9. #9
    Tadpole
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    Thanks to all for your comments.
    Had a chat with another mechanic (pug specialist) and said he has never had to pull gearbox apart on 306 as rarely give probs, sight unseen is still suggesting around $1000 to do input seal, must be the going rate here in perth.
    Are these blown spider gears likely bobomacho and would I know by the way it drives as seems to run ok?

  10. #10
    Tadpole
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    Quote Originally Posted by Proudys306 View Post
    Thanks to all for your comments.
    Had a chat with another mechanic (pug specialist) and said he has never had to pull gearbox apart on 306 as rarely give probs, sight unseen is still suggesting around $1000 to do input seal, must be the going rate here in perth.
    Are these blown spider gears likely bobomacho and would I know by the way it drives as seems to run ok?
    Any ideas on my previous post?

    Cheers

  11. #11
    Fellow Frogger!
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    Sorry didn't see this post. Usually blown gears have no drive at all, but I have had a couple with a hole in the box still going fine.

  12. #12
    Tadpole
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    Thanks, hoping that scenario is unlikely then. Any idea if this leak left untreated can cause any issues with the clutch? (Eg disintegration).

  13. #13
    1000+ Posts Andrew Ch's Avatar
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    Unless you have a magic wand spend the dollars and fix the problem. The only guarantee anyone here will give you is that it will only get worse ......

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