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Thread: Engine from a manual 94 300tdi discovery to an auto 98 300tdi discovery

  1. #1
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    Engine from a manual 94 300tdi discovery to an auto 98 300tdi discovery

    Hi there,

    I am looking at pulling out the engine from my full of rust(and now water from all this rain) 94 manual 300tdi and putting it into a 98 model auto.
    The auto 300tdi has a cracked head, but the manual engine runs perfectly.
    Im just after a bit of info on things I should be looking out for with doing a full engine swap.
    I have access to a hoist but need to have the swap completed in a weekend.

    Otherwise I'm thinking of just swapping the head, but i dont know the condition of the bottom end on the auto car.

    I would appreciate any advice or info on either jobs.

    Thanks.

  2. #2
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    Provided there is no difference between the crankshafts for a manual vs auto donk, all should be ok. (Haven't heard of any such thing with the Tdi).

    Spend a few hours taking photos of both vehicles, underneath and under the bonnet. Compare, and make a list of bits that are not common to both. (Think things like kickdown linkages, etc.) Also look for any bracketry that is different between auto and manual.

    Work out exactly what will need swapping from one to the other BEFORE you start pulling bits out. Not too bad if the vehicles are physically close to each other, but if they're on opposite sides of town, it can be frustrating to be held up because of a missing clip or clevis pin!

    Being relatively lo-tech engines, the actual swap shouldn't be difficult. The '98 may have the electronic fuel control on the pump, but that would be about it.

    Good luck, report back (with pictures)!
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  3. #3
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    I think the back plate on the engine needs swapping over to fit the different transmission, otherwise it's the same.

  4. #4
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    As mentioned already you will need the flex-plate and associated hardware that is currently attached to the crank.
    The adapter plate between the engine and transmission will need to be swapped over.
    The kick down cable that is attached to the injector pump needs to be swapped.

    As a minimum you will need fresh coolant and Orings for the engine oil cooler lines.

    The hardest part is undoing the bell housing bolts, absolute pain in a disco from my experience.
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  5. #5
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    Isn’t there also differences in the fuel pumps with the auto engine putting putting out slightly more hp ?
    1998 Discovery 300TDi Manual SE7
    1996 Discovery 300TDi Auto
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  6. #6
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    Thanks for all of your input.

    My plan of attack at this stage is I'm going to try and start the auto engine to see what kind of noises it makes.
    I just bought it the other week knowing it over heated, but i dont actually know for sure that the head is cracked or the gasket is blown.
    It may have just split the radiator or burst a hose. He mentioned when it happen, water was everywhere under the bonnet.

    If it starts and the head looks to be fine, then it'll be a full radiator/hose update, also a low coolant level alarm.

    If the auto's head isn't any good but bottom end is fine, I will either use the manual head, or buy a recondition one to put in.

    and Worse case, if the engine has been full of water and wont crack over, I will do the full engine swap
    and yes, I'll keep you updated with photos too haha.

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