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Thread: Modified Fairey Overdrive

  1. #1
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    Modified Fairey Overdrive

    I’ve finally got around to starting a wee thread which I have meant to start for ages. For better or worse – and whether the masses are crying out for it or not – here are some notes on modifying a Fairey overdrive to give it a bit more oil capacity.


    But let me start at the beginning....


    Most of you will probably already know a lot of the peeves which people develop for the Fairey. One is its tiny, teeny standard oil capacity (approximately half a teaspoon of oil and two small anchovies). Another is that they can sound like somebody running through a partially frozen cat with a bench saw.

    They tend to run rather hot and can be run out of oil rather easily. I got mine new in 1997 (overdrive, that is – not cat) and, from memory, it was not noisy back then. But somewhere early along the way I managed to not check the oil like I should have and ran it dry and.... it became very noisy.


    As part of my recent-ish (and kind of not finished) re-fit of my IIA, I decided to have a go at a few modifications of the Fairey when I overhauled it. I considered the (by all reports much better) Roverdrive unit as a replacement, but it is rather expensive and, well, I kind of wanted to tinker a bit.


    So I did.

  2. #2
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    First thing was to make a few measurements of the overdrive in situ. The plan was for a greatly enlarged oil sump, so I wanted to make sure that what I made would fit alright in relation to the handbrake drum, not extend too low and have good clearance from the chassis, exhaust or any other part of the vehicle.


    So, when the engine and transmission were lying around not doing much on a nice concrete floor (actually, at Wally’s farm), I got out the ol’ set-square and a measuring tape.
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  3. #3
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    and?
    Safe Travels
    harry

  4. #4
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    Quote Originally Posted by harry View Post
    and?
    X2...and?
    Cheers, Rod


    BETSY
    1967 Series 2a. 109 4 cyl petrol, Fairey o/drive, Athol Hedges roof.
    Currently undergoing rebuild.
    Will have-- soft top, 4 wheel disc brakes, salisbury rear diff, military colour, 12 pin nato socket, dual pintle hitch....

    1975 Series 3. 109 6cyl 186, 5 speed Nissan cabstar gearbox, mechanical winch, roo bar, kings awning, 50" light bar, roof rack, twin 6"light bars, kings awning tent.

    1969 NO. 5 trailer. ARN 176 464. soft top.

  5. #5
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    ....and...

    Then I made up a cardboard template which seemed to be about what I wanted.
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  6. #6
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    But after you make an extended sump, it will still fail if the oil level gets below the gears.
    I guess it will take longer.
    Have you thought about a new seal?

    Regards Philip A
    Or you could fit a pump of course but added complexity.

  7. #7
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    Quote Originally Posted by PhilipA View Post
    But after you make an extended sump, it will still fail if the oil level gets below the gears.
    I guess it will take longer.
    Have you thought about a new seal?

    Regards Philip A
    Or you could fit a pump of course but added complexity.

    Yep, that's right. The oil still has to be at the right level, regardless of the total volume, so that the gears pick it up. The overall idea here is greater volume/less extreme heat. New seals do come into the equation. .

  8. #8
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    why don't you just use a 12v turbo scavenge pump e.g. VDO and run a remote oil cooler and filter, The extra capacity of the cooler & filter and lines is 1.5L , & the oil will last for ever as will the OD .

    Ive done same to my Iveco TC , raising total capacity from 3.0L to 4.5L & running cool . All you need to do is drill & tap for some hose fittings. has dropped operating temps from high 120's to high 80's .

  9. #9
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    Quote Originally Posted by goingbush View Post
    why don't you just use a 12v turbo scavenge pump e.g. VDO and run a remote oil cooler and filter, The extra capacity of the cooler & filter and lines is 1.5L , & the oil will last for ever as will the OD .

    Ive done same to my Iveco TC , raising total capacity from 3.0L to 4.5L & running cool . All you need to do is drill & tap for some hose fittings. has dropped operating temps from high 120's to high 80's .
    Because I didn't want any more ancillaries hanging off the transmission. With an extended sump, sure, it likely would not run as coolly as it would with an external cooler - but it's all a trade-off. No pumps or extra moving parts either.

  10. #10
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    Thought I'd seen this before.

    Which overdrive?


    Colin
    '56 Series 1 with homemade welder
    '65 Series IIa Dormobile
    '70 SIIa GS
    '76 SIII 88" (Isuzu C240)
    '81 SIII FFR
    '95 Defender Tanami
    '60 SII 109 ute (gone)
    Motorcycles :-
    Vincent Rapide, Panther M100, Norton BIG4, Electra & Navigator, Matchless G80C

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