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Northstar Engines and System Technical Discussion Discussion, motor swap in Cadillac Engine Technical Discussion; aite i give up the HT4100 is gunna come out in the near future. im thinking 500cdi.. that should be ...
  1. #1
    patrick420 is offline Cadillac Owners Member
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    motor swap

    aite i give up the HT4100 is gunna come out in the near future. im thinking 500cdi.. that should be enuff nut heh heh.. what do i need to do to the tranny? is it gunna bolt raight up? and are there any common problems with doing this like the fan hits the shroud or something like that? anyone do this? its an 83 sedan deville also.. any help would be cool...thanks

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  3. #2
    SoundAdvantage's Avatar
    SoundAdvantage is offline Cadillac Owners Enthusiast
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    4100

    If you like the 83' and plan on keeping the car then i would find another 4100 out of an 87' model deville that still runs good and make sure you hear it run before you buy it. I have a 87' i have owned for 4 years, it runs very well and has been well maintained. If you can find one that has been taken care of that would be your best bet.

  4. #3
    Katshot's Avatar
    Katshot is offline Cadillac Owners Master
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    If you intend to install a 500 motor, the LEAST of your problems will be the fan shroud. I would suggest that you talk to someone who has done a motor swap like that so they can give you the low-down. And don't worry about the trans, it's not going to work, I would suppose a TH400 would be the trans of choice in your case.
    And BTW, SoundAdvantage,
    His car is a RWD car and the two HT4100's aren't interchangable. The RWD HT4100 is unique, only the FWD engines can be swapped from year to year. Matter of fact, you might want to exchange yours for a 4.9 from a newer car.

  5. #4
    Mad'lac's Avatar
    Mad'lac is offline Cadillac Owners Connoisseur
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    www.hwforums.com/2089/
    Try this site. Some of the guys have done this swap before.


    Also this site is from a guy who did this swap in a 81 Fleetwood limo www.mindspring.com/~dburden/engine_swap.html

  6. #5
    SoundAdvantage's Avatar
    SoundAdvantage is offline Cadillac Owners Enthusiast
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    Kevin,
    My 4.1 runs fine i really don't need a newer engine but thanx for the suggestion, i was ready to by a 95' STS but my mechanic talked me out of it, i really like my 87' and besides, it's paid for.

    Mike

  7. #6
    Katshot's Avatar
    Katshot is offline Cadillac Owners Master
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    Originally posted by SoundAdvantage
    Kevin,
    My 4.1 runs fine i really don't need a newer engine but thanx for the suggestion, i was ready to by a 95' STS but my mechanic talked me out of it, i really like my 87' and besides, it's paid for.

    Mike
    Mike,
    That's cool, I wasn't sure if you were aware that your engine was pretty much a direct swap with the newer 4.5 and 4.9
    Just thought I'd pass it on.

  8. #7
    SoundAdvantage's Avatar
    SoundAdvantage is offline Cadillac Owners Enthusiast
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    Talking 4.5/4.9

    Thanx for the info Kevin, it's nice to know i can upgrade to a bigger engine later. My 4100 has 144K original miles on it, i just had to replace the water pump last week, i got lucky though i pulled it out of the garage to wash it and after i was done i started it up and the pump started dropping antifreeze all over my driveway. I am thankfull i wasn't out on the road when it happened. I bought a brand new pump for it and the engine is really running well.
    Question for ya Kevin aside from the fuel injection on the 4.9s what else is different from the 4100s ? did they use the same block? How many years did Cadillac make the 4.9 engines?


    Mike

  9. #8
    Katshot's Avatar
    Katshot is offline Cadillac Owners Master
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    The 4.9 was used from '90 to '95, and there's very few parts that are the same between the 4.1 and it's later (and better) itterations. Sorry. It's not that the block is the same and that's why they are such an easy R&R. It's that the mount-points are the same so it eases installation. At least that's what I'm told. I've never actually done the swap.

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