DPO to AL4 housing/ mounting difference
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Thread: DPO to AL4 housing/ mounting difference

  1. #1
    Fellow Frogger! dimistyle's Avatar
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    Default DPO to AL4 housing/ mounting difference

    Does anyone have details of what it would take to fit a DPO from a Megene 2.0 diesel into a C5 mk1. There are plenty of DPO auto boxes about but no AL4 C5 HDi 2.0 about.
    Just looking at options.

    Also if anyone has a spare AL4 valve body I can borrow to see if I can get my box to perform differently.

    Looks like the box has to come out again to see why 1st and 2nd have no drive!!

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    Last edited by dimistyle; 9th February 2017 at 02:43 PM.

  2. #2
    Fellow Frogger! dimistyle's Avatar
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    Bump.....no one ever had a DPO and AL4 side by side?

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    I suggest you look at the thread I just put on the Peugeot site.....Fair chance that your headache may be solved.

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    Fellow Frogger! dimistyle's Avatar
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    Did you mean Tony frenchtransrech? Pretty sure my F3 brake band is broken so will have to remove even if I find a compatible unit.

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    I wonder if the choice of the Megane Diesel unit is the way to go. From my own attempts to source a replacement box for my Megane Diesel is any example, they are rather thin on the ground as a second hand unit.

    After making many enquiries around the trade the problem seems to be that as the diesel box is different and none were available.the best course was to do a complete strip and refurbish of the box with new parts to replace damaged parts.

    If anyone has driven a Diesel Megane on decellaration the box has a retarding effect through fluid and the stator vane (if I have got the terminology right), this puts a heavy strain on the stator vanes and so I was told the material breaks up under the continual and opposing loads, sometimes the aluminium debris will just clog up the box and can be cleaned and the slippery solinoids from Tony fitted and an oil change might clear the problem, but it will come back as more vanes break up in service.

    That advice came from within the trade and I had our transmission completely rebuilt (an expensive option) and had to wait for supply of the new stator supplied from over seas. I was actually looking forward to probing the innards myself, but had to settle for trusting the rebuilder, so far touch wood it is still going under warranty and I will probably drive it until it stops for good to partly recover the cost.

    I enjoy the car, I enjoy the economy of the diesel, so happy with that. I'm happy if anyone with more actual knowledge of the internals can fact check that for you, as mine is only hearsay from the transmission specialists. I neglected to do as I usually do and ask to see the faulty parts that were replaced, so I can't confirm - but it is going o.k. now.

    Ken

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    Fellow Frogger! dimistyle's Avatar
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    I think that will be the trans cooler vanes breaking down as these should be replaced every time the box is removed so I have been told. This is where the fine metal that becomes a paste on the cover magnets.

    Anyway I would have thought it came from the converter inner?

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  7. #7
    Gone Fishin' Haakon's Avatar
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    I have a freshly rebuilt AL4 I've kept as a spare for the Megane - my understanding is you'll need to split the bellhousing/final drive casing off the main body and swap on these parts from the AL4.

    You'll want to use your own final drive anyway as the deisel will i am sure be very different.

    But internally the gears are the same and aside from some minor differences with brackets etc it should be compatible.
    dimistyle likes this.

  8. #8
    Fellow Frogger! dimistyle's Avatar
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    Yep been through this the 1st time when I bought a know good petrol AL4 and asked about changing the final drive. In the end was only friction plates and a filter but have had a valve body issue ever since affecting 1st & 2nd which we put down to worn bore but may have been a F3 band instead. Anyhow now the pressure drops off after a few minutes of driving down to 1.65bar to be exact so clutch release and I'm stuck on the road. Reverse works to get back up the drive.

    So after 2.0 diesel box swap options before pulling the box out again.
    This C5 is great on the highway and economical for the km I drive every week so would like to keep on the road rather than on the heap.

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    Cool - if you're done the swap from another AL4 type like that, than the DPO is no different. Its just another bellhousing type at the end of the day.

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    Fellow Frogger! dimistyle's Avatar
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    That's what I needed to hear. Do you know if there's a Renault doc with the final drive details so I can confirm the 2.0 diesel is the same as CitroŽn 2.0 diesel. Just looking at full box swap option as I didn't end up doing the final drive swap as it all became too difficult. Bell housing swap would be easier than a full dismantle to swap guts. Cheers

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  11. #11
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    Quote Originally Posted by dimistyle View Post
    I think that will be the trans cooler vanes breaking down as these should be replaced every time the box is removed so I have been told. This is where the fine metal that becomes a paste on the cover magnets.

    Anyway I would have thought it came from the converter inner?

    Sent from my GT-I9195T using aussiefrogs mobile app
    I just looked up one of the emails from the firm the unit had been refurbished apart from the installation of a new Torque converter that had to be ordered overseas and scheduled to arrive late that week. In speaking to them they told me that for some reason the vanes on the Torque converter break off and eventually you lose drive and the gunk gets distributed in the box, I think the part was invoiced at between $1500 to $2,000 cost but I can't find the invoice to check that figure. Checking with my wifes relative in Adelaide (who does auto transmissions) and that problem was mentioned as a probable failure point. We were trying to sort out if we could get our hands on a replacement box, they checked their sources and could not find one available to be fitted off the shelf in the trade.

    I had the box done at R & B in Melbourne.

    Ken

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