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Thread: gearbox selector seals

  1. #1
    Apprentice series2steve's Avatar
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    Default gearbox selector seals

    the tunnel is off my 2a, and ive found the mega leak

    ****ing out from bottom of gearlever area

    i read somewhere about peeps replacing these little seals and still leaking

    anyone done these before ,how did it go?

    cheers steve
    1967 2a pick up petrol

  2. #2
    Engineer holly76's Avatar
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    Default Re: gearbox selector seals

    to be honest the seals are crap. rings of square section rubber. i did mine as part of a gearbox rebuild. so i'm not sure of how you would do it in situ. the shafts wold have to be taken out of the selctor forks to slide the seal on. a few things to check though. are the shafts covered in mud/corrosion. this is quite a mud trap, especially if used for deep wading. also are the seal retainers in place, and in good condition. and is the top of the gearbox the correct one. they are machined as a set and parts should not be swapped. i'm not sure how to check that though. they is no gasket betweeen the housing halfs so a thin smear of hylomar is used. so the parts have to be perfectly flat and clean. also unc bolts are used and it is not uncomon for these to shear, which could result the joint opening up.

    also worth checking the breather is clear (top of housing bolted to the transfer box under the lip of the seat box) and the gearbox is not too full of oil.

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    Apprentice series2steve's Avatar
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    Default Re: gearbox selector seals

    ill take a look on the weekend ,cheers
    1967 2a pick up petrol

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    Default Re: gearbox selector seals

    Jetwash to whole lot then take the gearbox top cover off, fit new seals and reseal the joint with Hylomar. Have a long flexible magnetic pick up for the little balls that are certain to fall into the box! You need the shaft seals and the ball/spring seals and make sure you don't mix the springs up.

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    Default Re: gearbox selector seals

    272596(2) 272597(1) 5852(2or3?)

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    Default Re: gearbox selector seals

    Best get one of these and remove the outer balls before lifting the top off.
    http://www.ebay.co.uk/itm/Bergen-Lon...IAAOSwwNVTs8im
    The rubber seals on the side springs can generally be re used.
    The top joint should have no sealant or gasket when refitted , as said on series 2 forum you can get the alternative seal set with the ptfe seal.
    Check the top ID number confirms to the number stamped on gear casing usually front edge /side near selector bores.
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    Consultant Richie_asg1's Avatar
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    Default Re: gearbox selector seals

    I would replace the rubber tube type seals that cover the side detent springs as they will be old and or split. Not the major leak area but just another one. I replaced my square section seals and made no difference, I'm going the PTFE seal route the next time. You can take the selectors out with the top off, but there is a knack.

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    Default Re: gearbox selector seals

    Quote Originally Posted by Richie_asg1 View Post
    I would replace the rubber tube type seals that cover the side detent springs as they will be old and or split. Not the major leak area but just another one. I replaced my square section seals and made no difference, I'm going the PTFE seal route the next time. You can take the selectors out with the top off, but there is a knack.
    It's easy enough, I did mine after I fitted the gearbox....surprising how much oil comes out the selectior seals. The new ones I bought weren't good either. I cut one with a Stanley knife then cut about 2mm out of it and super glued it back together before refitting to make it a tight fit.
    It is fiddly getting the selectors in and out, think 3rd/4th out first as it's in the middle. Think 1st / 2nd was the tricky one!
    If its in the way, throw it away!
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    Default Re: gearbox selector seals

    i aint looking forward to this................................cheers boys
    1967 2a pick up petrol

  10. #10

    Default Re: gearbox selector seals

    You can stop the balls falling into the gearbox by removing the springs then forcing grease into the holes to stick the balls where they are.

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    Default Re: gearbox selector seals

    Agreed, its a simple job but it is things like not dropping the balls, not mixing up the springs and being very careful about where the selectors are that make all the differnce. After that its only a handful of nuts and bolts.

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    Default Re: gearbox selector seals

    Quote Originally Posted by Extreedoc View Post
    You can stop the balls falling into the gearbox by removing the springs then forcing grease into the holes to stick the balls where they are.
    Or use a magnet. Much safer if you get them out first, but you can still loose the side bars that act as interlocks. Remember to take the middle seat base out to get to the rear bolts.

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