306 woes - auto trans slipping
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  1. #1
    IWS
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    Default 306 woes - auto trans slipping

    Hello all,

    I posted the weekend before last about woes with my daughter’s 306 .

    On advice of a (mobile) mechanic (mechanic #2) I feared the engine was cooked and that engine problems had caused problem with the auto gearbox.

    I went back to mechanic #1 – who had done initial cooling system repair. They doubted cooked engine diagnosis and proved to be right when compression test showed compression OK, no milky oil and no back pressure in the cooling system. High speed fan was working intermittently so was replaced. Plugs were badly fouled so these replaced and car ran nicely and at correct temperature.

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    All seemed good – until today … Daughter tells me car “will not accelerate”. Driving it I find that as soon as it gets mildly hot the auto trans slips – and gets worse as it gets hotter.

    I’m suspecting that mechanic #2 was right – auto tranny is shot. Am I being too pessimistic? Might it be a simpler problem? (He hopes madly that this is so ...)

    Car has done only around 130k and all regular servicing done by French specialist.

    As always - will welcome your opinions and comments.

    Ian.

  2. #2
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    What's probably happened is the transmission cooler has corroded and leaked into the tranny. So you'll have a mixture of transmission oil and coolant causing the bands to slip. If that's the case, it's stuffed!

    We had the same problem last year. It happened quite suddenly and the wife had to call a tow truck, but there had been some tell tale signs in hindsight, no always changing gear smoothly and a bit slow to take off sometimes - but not always.

    Check the dipstick and see what shows. This should give some pointers.

    A rebuild is about $3k, plus labour to pull out and refit. Alternatively you could look for a second hand one. That's if you want to keep the car!
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  3. #3
    1000+ Posts cav91's Avatar
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    What sort of the 306 is it and year? Has it got the late AL4 trans or the earlier (better) ZF trans?
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  4. #4
    Fellow Frogger! XM Mechanic's Avatar
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    How about an oil change in the auto? That will see what condition the oil is in and may be all it needs. If it is just an oil change then remember it takes a few to change all the oil. Good luck.
    Regards,

    Garth.


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  5. #5
    IWS
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    Thanks all for comments and suggestions. I should have been clearer about the car - it is a 1994 XT, 1.8i. So I guess that means the earlier (better?) auto trans.

    I talked to my mechanic today who suggested checking the level of the transmission fluid and topping up if required. It was a little low - but not seriously so - and I added a little Dextron fluid.
    That has removed the slipping but the transmission still does not sound good in low gears. When idlling in park there is a noise from the transmission which I do not like. So, seems like another visit to the mechanic to get them to diagnose and prescribe ...

    Ian.

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    Hi-Dexron is not the correct fluid -it will destroy the gearbox-I think Transmax m is the correct fluid.

    Pekay.

  7. #7
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    You have the ZF 4HP 14 - 4 Speed Auto and you can buy an overhaul kit for it.

    Most likely the seals have perished due to overheating or contamination. Drain it and find out.

  8. #8
    IWS
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    Quote Originally Posted by 908HDI View Post
    You have the ZF 4HP 14 - 4 Speed Auto and you can buy an overhaul kit for it.

    Most likely the seals have perished due to overheating or contamination. Drain it and find out.
    That is good news! (The overhaul kit). I was thinking anyway - given earlier advice - to drain and refresh the transmission fluid so will explore the overhaul kit option. Overheating is likely as the starting point for these problems was the car overheating.

    And the Dexron - in reply to pekay 49 - Decron is what my mechanic advised I put in. I guess if it *is* the wrong thing there is only a little that has gone in and ti will be drained soon anyway.

    Ian.

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  10. #10
    IWS
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    Sad ending to this story. Auto trans has been diagnosed by a specialist as having major internal failure (maybe the pump?).

    Repair costs quoted are prohibitive and I'm wary of putting a second hand auto gear box (at 10 hours to remove and refit, plus cost of gearbox, that would be an expensive exercise in itself.

    So looks like the 306 will be off to the wreckers

    If anyone is interested in buying the car - unregistered - in order to wreck or repair pmail me to have a chat

    Ian.

  11. #11
    Fellow Frogger! Bruce Llewellyn's Avatar
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    Default Been here...

    306 auto is very sensitive to mis rigging of the kickdown cable. Have burned out the clutches in a few kms with the cable out.





    Quote Originally Posted by IWS View Post
    Sad ending to this story. Auto trans has been diagnosed by a specialist as having major internal failure (maybe the pump?).

    Repair costs quoted are prohibitive and I'm wary of putting a second hand auto gear box (at 10 hours to remove and refit, plus cost of gearbox, that would be an expensive exercise in itself.

    So looks like the 306 will be off to the wreckers

    If anyone is interested in buying the car - unregistered - in order to wreck or repair pmail me to have a chat

    Ian.

  12. #12
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    I learnt from a mate many moons ago from a mate who was a transmission re-builder that the kickdown cable is the 'life blood' of a transmission.
    Apparently little has changed.
    I did some work on a mate's wife car a while age -The kickdown had never been adjusted properly over the 150,00 k's plus they had owned the vehicle-So it is something to watch.
    The 'old' setting used to be that it should drop into top on a light throttle @ 60 k's.

    Pekay.

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