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Thread: LDT-465 back to multifuel

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    Default LDT-465 back to multifuel

    I just bought a 1971 M35A2 that has a Continental LDT465 converted to diesel only. I was wondering if I could and how difficult it would be to convert it back to multifuel? Not that I would ever want to do more than run used veggie or motor oil but you never know....

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    General skinnyR1's Avatar
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    FDC bypass to "convert" to diesel is a common misconception. It just turns the pump up so there is no more compensating or regulation.

    Run whatever you want as it is, it is a multi fuel currently.

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    What skinny said. Look up "FDC - fuel density compensator". Bypassing this item eliminates a common source for internal fuel leaks. If yours had it done, it is an improvement, especially for non-cold-war-battlefield daily use.
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    Quote Originally Posted by zygomedic View Post
    I just bought a 1971 M35A2 that has a Continental LDT465 converted to diesel only. I was wondering if I could and how difficult it would be to convert it back to multifuel? Not that I would ever want to do more than run used veggie or motor oil but you never know....
    its ok to run New Motor Oil etc, but never run "used", unless you have a 1700$ extra IP on your shelf.

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    my understanding is that the fdc does make a difference. A wise man once told me just because something works does not mean it right

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    This topic has been covered completely, many many times.

    The fdc simply tries to regulate power output with varied fuels that have more or less btu's based on viscosity.

    It is not perfect but does "make a difference".

    It is NOT what makes the engine capable of using a variety of fuels. That is done by piston and injector design.

    After a while, the military discontinued the use of the FDC. Most likely due to it's frequent leakage of fuel into the engines oil.

    You do not need it.

    I would not recommend reconnecting it.

    If you vary your fuels or want to turn up your fuel rate, you need to install a pyrometer. This is the only safe plan.
    Last edited by doghead; 08-12-2019 at 20:17.
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    dogheads more complete answer reminds me that when doing modification one should do it correctly and that it may require to do other things as well for example larger tires may require different rims, heavy axlses and other things. I'll have to see if I can find something regaurding the military doing it and see how they went about it.

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    Quote Originally Posted by Nomad1 View Post
    Doghead's more complete answer reminds me that when doing modification one should do it correctly and that it may require to do other things as well for example larger tires may require different rims, heavy axlses and other things. I'll have to see if I can find something regaurding the military doing it and see how they went about it.
    Why not just spend an afternoon searching this site? There's a wealth of outstanding info here, the search function is fairly easy to use (Pro Tip: go into appropriate forum first, such as "The Deuce", enter your search terms under "Search Forum" drop-down tab). Probably better than anywhere else available on the interwebs, especially fakebook.

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    I have spent the last few days searching the forum but have not found anything on downgrading, and I am not confident that just reverse engineering the mod is going to be the answer. But maybe it would. Don't want to risk my investment on a maybe.

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    Quote Originally Posted by zygomedic View Post
    I have spent the last few days searching the forum but have not found anything on downgrading, and I am not confident that just reverse engineering the mod is going to be the answer. But maybe it would. Don't want to risk my investment on a maybe.
    Running crap fuel will do far more damage to the fuel system and engine than worrying about the FDC bypassed . You can't filter out the super fine metals or acids in used motor oil.

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