1984 Coupe DeVille Engine Swap! - Page 34
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RWD 19xx-1984 DeVille and Fleetwood,
1985-1996 Fleetwood and Brougham Forum Discussion, 1984 Coupe DeVille Engine Swap! in Past Cadillac Vehicle Discussion; do you still have the old 4100 or did you scrap it already?...
  1. #496
    minidave is offline Cadillac Owners Member
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    Re: 1984 Coupe DeVille Engine Swap!

    do you still have the old 4100 or did you scrap it already?

  2. #497
    talismandave's Avatar
    talismandave is offline Cadillac Owners Master
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    Re: 1984 Coupe DeVille Engine Swap!

    Quote Originally Posted by minidave View Post
    do you still have the old 4100 or did you scrap it already?

    Why do you ask? Do you have a boat that keeps floating away?

  3. #498
    greencadillacmatt's Avatar
    greencadillacmatt is offline Cadillac Owners Connoisseur
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    Re: 1984 Coupe DeVille Engine Swap!

    Quote Originally Posted by minidave View Post
    do you still have the old 4100 or did you scrap it already?
    It was scrapped about 4 years ago. I rolled up to the big metal recycling dumpster at the college, shoved in the whole engine, and thought to myself "nobody will notice that, right?"
    77CDV, outsider and talismandave like this.

  4. #499
    Aron9000's Avatar
    Aron9000 is offline Cadillac Owners Master
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    Re: 1984 Coupe DeVille Engine Swap!

    Quote Originally Posted by greencadillacmatt View Post
    It was scrapped about 4 years ago. I rolled up to the big metal recycling dumpster at the college, shoved in the whole engine, and thought to myself "nobody will notice that, right?"
    Ah, you probably shorted yourself at least $20 in scrap aluminum. I got $20 for an old leaky radiator a couple years ago.

    Any chance your Coupe Deville will be running for a nice Memorial Day cruise?

  5. #500
    greencadillacmatt's Avatar
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    Re: 1984 Coupe DeVille Engine Swap!

    Quote Originally Posted by Aron9000 View Post
    Ah, you probably shorted yourself at least $20 in scrap aluminum. I got $20 for an old leaky radiator a couple years ago.

    Any chance your Coupe Deville will be running for a nice Memorial Day cruise?
    I wasn't concerned about the scrap, I just needed to be rid of the engine. The metal dumpster was convenient. (And funny!) I'm hoping for the end of June at the latest.


    As far as work on the Cadillac goes, I got quite a bit done today. I started by installing ALL three of my belts. I've even got A/C!



    Afterwards, I jacked it up, put it on stands, and crawled under to install an oil filter.



    The stock drain plug for the oil pan was pulled and replaced with a new plug (with a magnetic tip) and a new o-ring. (There actually was NO o-ring on the old one!)



    Once I made sure the engine could hold it's drink, I slid around to the passenger side and connected my trans cooler lines to the transmission. (The trans cooler side of the lines still need to be connected, but I ran out of time.) I will be zip-tying the rubber parts of the lines up and away from the exhaust. While I was under there, I also untangled some of the harness wires from my passenger side exhaust manifold.



    Lastly today, I placed a pan under the engine and poured in 5 quarts of 10w30 and a bottle of engine break-in additive (high zinc!). I haven't turned it over and pressurized the system yet, but no leaks so far. Finally, after 4 years, I was able to check the oil in my engine.



    All in all, it was a good day.

    Oh, one question before I go to bed: WHERE THE HELL IS THE FUEL RETURN LINE TO THE TANK?!? I think I'm going nuts looking for this thing. I can't move forward on the fuel system until I find it. Thanks guys. It's probably staring me right in the face and I don't realize it.
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  6. #501
    Stingroo's Avatar
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    Re: 1984 Coupe DeVille Engine Swap!

    Woot!



  7. #502
    outsider is offline Cadillac Owners Connoisseur
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    Re: 1984 Coupe DeVille Engine Swap!

    does it have a fuel return line to the tank? I don't think my 307 has one...I feel like there's a line that comes out the back of the carb and goes into the intake manifold? I'm not 100% sure but I don't think I've seen one...

  8. #503
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    Re: 1984 Coupe DeVille Engine Swap!

    Good work, Matt! You'll have her on the road in no time now!

  9. #504
    cadillac kevin's Avatar
    cadillac kevin is offline Cadillac Owners Master
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    Quote Originally Posted by outsider View Post
    does it have a fuel return line to the tank? I don't think my 307 has one...I feel like there's a line that comes out the back of the carb and goes into the intake manifold? I'm not 100% sure but I don't think I've seen one...
    My 307 has one. I know this because mine is capped below the fuel pump.

  10. #505
    greencadillacmatt's Avatar
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    Re: 1984 Coupe DeVille Engine Swap!

    Remember folks, it was fuel-injected. I do believe cars with a mechanical pump just suck up as much fuel as needed to feed the carb, and they have one line in from the tank. Being that mine originally was early fuel-injected, the pump makes about 13 psi all the time, it pressurizes the two throttle body injectors, and the rest goes back to the tank. It's no where near new enough for a returnless fuel-injection system. I distinctly remember disconnecting two pipes from the old throttle body, and I cant for the life of me find the return line since I put in the new engine.

    Also, if I'm COMPLETELY wrong on any of this, please correct me. I need the pointers. Hahaha.

    EDIT:

    I just watched a video on YouTube of a dude taking apart the throttle body on an '84 Coupe DeVille. There IS a feed line and a return line. I'm guessing that when my engine went in, my return line either hooked the back of my block or the top of the trans. I'll be crawling under the car with a flashlight at the end of the week when I get another chance to work on the car. Good. I'm glad I'm not nuts.

  11. #506
    greencadillacmatt's Avatar
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    Re: 1984 Coupe DeVille Engine Swap!

    I FOUND IT! I'M NOT INSANE! (Well, maybe not that insane...)

    I am talking about, of course, my fuel return line. And just as I thought, it was jammed up on top of my transmission, like so:



    It took me about a half hour to pull that thing out without bending or kinking the line. I was laying under the car and mostly doing all of this one-handed (there was a jackstand in the way of the other one!) But I prevailed and got the line back up top like it should be!



    And here it is back where it's supposed to be:



    After digging out the return line, I started searching around for a spot for my fancy Holley fuel pressure regulator. I was originally thinking of putting it where my cruise control servo is, especially since mine is an aftermarket system, but I like cruise, and since it's not factory I might be able to re-use it with my new engine. While inspecting the cruise control servo area, I noticed that there might be just enough room on the inside of it, between it and the body structure, especially if I put the regulator at a slight angle, like so:



    Here is the regulator in the same spot, but viewed from the top:



    The regulator came with 3 sheet metal screws, and I can just drill the mounting bracket right into that spot. That slight angle gives me better access to the inlet (towards the firewall), the return (out the bottom, and there is just enough space to hook up the fuel line), and the outlet has tons of open space to run fuel line to the carb. Anybody object to this as a mounting spot, or see any potential problems with it or the slight angle I have it at? If you guys have any better ideas then I am all ears. All of this is by far and away uncharted territory for me.

    Thanks for looking! Hopefully it won't be so long between posts next time!
    77CDV and talismandave like this.

  12. #507
    csbuckn is offline Cadillac Owners Master
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    Re: 1984 Coupe DeVille Engine Swap!

    Nice find on the return line. I'm not too sure about the spot because of vibration and wear. It should be okay since its not electrical and the only moving part is held with a jam nut but thats a tight fit. Well, looks like you can bend that cruise mounting bracket out a little to get it off the regulator.

  13. #508
    greencadillacmatt's Avatar
    greencadillacmatt is offline Cadillac Owners Connoisseur
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    Re: 1984 Coupe DeVille Engine Swap!

    Quote Originally Posted by csbuckn View Post
    Nice find on the return line. I'm not too sure about the spot because of vibration and wear. It should be okay since its not electrical and the only moving part is held with a jam nut but thats a tight fit. Well, looks like you can bend that cruise mounting bracket out a little to get it off the regulator.
    Where is it that you mounted your regulator? You are using the same one, right?

    The cruise servo wouldn't actually be touching the regulator, I just set it in there to take the pictures.

    Any other ideas for mounting it? That's best spot I could find, but I'm sure there are more. Haha.

  14. #509
    csbuckn is offline Cadillac Owners Master
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    Well if the cruise won't touch it, you'll be alright. I thought it was gonna be jammed in that spot.

  15. #510
    greencadillacmatt's Avatar
    greencadillacmatt is offline Cadillac Owners Connoisseur
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    Re: 1984 Coupe DeVille Engine Swap!

    Quote Originally Posted by csbuckn View Post
    Well if the cruise won't touch it, you'll be alright. I thought it was gonna be jammed in that spot.
    Haha, nope! There is maybe a 1/4 inch gap, and I'll bend the cruise mount outward juuuust a bit. Thanks! Just gotta hit the hardware store for some fuel line bits, and I should be able to finish my fuel system tomorrow!

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