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Thread: Converting a Vacuum CDL to Mechanical?

  1. 4th April 2008, 02:29 PM #1
    Davo
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    Converting a Vacuum CDL to Mechanical?

    I've heard of such a thing done to a centre diff lock but haven't seen it. Since once the vacuum capsule is removed there's just a steel shaft sticking out it doesn't look like it would be too hard to convert it. Anyone know?
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  2. 4th April 2008, 07:52 PM #2
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    loanrangie
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    I'm pretty sure the 2B FC camper i spied over easter had a mechanical cdl on the LT95 as i couldnt see a vac unit, looked to be cable operated.
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  3. 4th April 2008, 08:56 PM #3
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    fairly easy to do providing the seal on the shaft is in good nick a push pull cable is the easiest way to do it and a mechanical linkage the most reliable...

    but the seal isnt all tha ttough and it wont take much dirt to snaff it.
    Dave

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  4. 6th April 2008, 11:21 AM #4
    Davo
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    Yes, that thought occurred to me as well and I was thinking of taking a small block of ally and machining an o-ring groove into it. Then the actuating shaft would be sealed much like the hi-lo shaft at the front of a Series output housing. Or maybe it could be machined to take a little lipped seal, like the clutch shaft on a SIIA. Whaddayareckon?
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  5. 6th April 2008, 01:21 PM #5
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    Why? I think it was the best locking system ever, remote switching is the go, with a few vac lines, diaphragms rarely fail and they're usually oil coated


    But couldn't see it being difficult, just a pivot and a lever
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  6. 6th April 2008, 04:02 PM #6
    Davo
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    Just one thing less to go wrong . . .

    . . . in theory!
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  7. 6th April 2008, 08:29 PM #7
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    Quote Originally Posted by Davo View Post
    Just one thing less to go wrong . . .

    . . . in theory!
    Mine never went wrong in 525000kms
    always worked really well
    Brad
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  8. 6th April 2008, 08:47 PM #8
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    The advantage of the vacuum system is that it automatically provides for applying pressure to the lock, which then moves when free to do so. To provide this without the vacuum operation would complicate the mechanical mechanism.

    In 40,000km the only problem with mine has been when the reverse light switch wiring melted and took the vacuum line with it. Ten minute fix with a bit of 8mm hose.

    The vacuum setup is so trouble free I would not bother to try and change it unless you want to do it just to make something for the heck of it.

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  9. 6th April 2008, 10:54 PM #9
    Davo
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    Crikey. Okay, so I'll stick with the vacuum system then. I'm changing from a IIA gearbox and this "modern technology" is all new to the likes of me. I didn't realise it was so dependable. Thanks for that everyone!
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  10. 7th April 2008, 02:55 AM #10
    Tombie Guest
    Quote Originally Posted by Davo View Post
    Yes, that thought occurred to me as well and I was thinking of taking a small block of ally and machining an o-ring groove into it. Then the actuating shaft would be sealed much like the hi-lo shaft at the front of a Series output housing. Or maybe it could be machined to take a little lipped seal, like the clutch shaft on a SIIA. Whaddayareckon?
    An o-ring is a shocking way to try to keep contamination out...

    It'll run dry and cause excess stiction on the shaft.

    If you did decide to go mechanical an "AN" type wiper seal would be preferred method of reducing ingress.

    Or a 'canned' type wiper seal.
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