5.7 Hemi Engine swap on 70 RR (Project)

New Hemi Engine Swap

  1. Caterpillars

    Caterpillars FBBO Gold Member FBBO Gold Member

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    Thanks for your help Catfish, but I think I have my alternator problem solved. Now I have a no start issue. Before sending the PCM off I got under the hood with my test light and meter, because I had that one relay with only one power on it (relays always have two powers). I took the cover off the bottom of the fuse/relay box and traced the wire - it went into the wiring harness and ended with a tag on it saying AC - so this relay is not needed because I have the AC run on a independent relay. Everything else looked OK, but I check this little black looking fuse on the top of box. Found part # F57B-14A604-A on the "diode", not fuse (I always heard a bad diode would make your light pulsate). Found out you can only get continuity on a diode in one direction and you have to switch meter leads to test in the right/both directions - I'm getting nothing in either direction. So I finally got a hold of Mopar tech. support and talked to Don (https://www.moparproshop.com/customer_support) - nice guy, spent a lot of time with me. Told me to take my PCM out and take it to the dealer to be analyzed (when you analyzed something it cost more than if you just check it). Don also lead me to a wiring diagram.

    PCM_diode.JPG

    Not exactly my fuse box but close to what I have. If you notice on top, left of the relays is the "PCM Power Diode" (bingo, maybe). I tried to get one at the auto part store, nothing. I can order one on Ebay/Amazon but 2 week delivery times (but still trying). I think I'm getting close.

    diode.JPG

    It would be wonderful if I didn't have to spend $2300.00 on a new PCM/wiring harness/gas pedal combo, not to mention a new intake and throttle body! XXXX'ing my fingers this $8.00 diode is the fix.. Have to be careful what roads you go down...
     
    Last edited: Jul 1, 2020
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    • Caterpillars

      Caterpillars FBBO Gold Member FBBO Gold Member

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      Received the new diode and it is testing the same as the old. No continuity either way but when I put power on one side I get 12v on the other (only in one direction). Not the $8.00 diode...
       
    • Caterpillars

      Caterpillars FBBO Gold Member FBBO Gold Member

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      Update; After a few days of frustrations and learning more about PCM's then I ever wanted to know, I decided I was going down the wrong road. I was in the process of ordering a new PCM but everyone keep asking what my VIN number was. After explaining nobody seem to want to help (or maybe they don't know how). Can't tell you how many companies I left messages with and nobody returned my calls. The PCM, wiring harness world seems like a secret society that doesn't want to give out to much information. The Mopar people referred me to a company (Arrow Racing) that supposedly did all their crate engines PCM's but they are out of business, I guess. Mopar's answer to everything was "take it to the dealer", and the dealer asked "what is your VIN number. What a circle jerk!
      My son convinced me to go back to the original problem, so I put the wiring harness, fuse box and PCM back the way it was. Then I unplugged the alternator's field wires and it started (by the way, I burnt out another alternator - 5th one - thanks goodness for O'Reilly's lifetime warranty). I had the ignition wire hooked up to both the alternator and the new wiring harness, so I separated them, same result. Now I think I'll put a toggle switch to battery and separate it from the ignition switch. New alternator runs a little warm and pulsating continues.
       
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      • Caterpillars

        Caterpillars FBBO Gold Member FBBO Gold Member

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        The separate toggle switch solve the problem. It operates the fuel injection and power relay which sends power to the Pcm. The ignition wire circuit goes to the field wire on the alternator. Everything seems to be working great so I'm calling the conversion part of this project done. Still have a few things to do like a headliner and getting the window tinted. Then just some odds and ends. Anyway two years - some good times and plenty of frustrations. Hope this helps some nut out there make it a little easier, and thanks to all who help me with the many problems I had. Now lets go for a ride....
        Music by Caterpillars

         
        Last edited: Jul 28, 2020
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        • 70chall440

          70chall440 FBBO Gold Member FBBO Gold Member

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          Thats awesome, I need to go through all of the pages and see how you did it. I am thinking of putting a 5.7 in a 71 Charger I just bought. I'd like to understand what is needed to put a 4 spd behind one (A833) as well as the electrical aspects.
           
        • Caterpillars

          Caterpillars FBBO Gold Member FBBO Gold Member

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          If you need help let me know...
           
        • 70chall440

          70chall440 FBBO Gold Member FBBO Gold Member

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          So the crate motor came with a flywheel that put the starter on the passenger side?
           
        • Caterpillars

          Caterpillars FBBO Gold Member FBBO Gold Member

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          Yes, if I can remember right. It uses a Challenger starter so the setup is for a Challenger. Lots of crates are setup for truck and the starter is on the drivers side. Also, make sure the ring gear is on the correct side of the flywheel or you will be pulling the tranny after you think your all done.
           
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          • 70chall440

            70chall440 FBBO Gold Member FBBO Gold Member

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            Thanks. I am pretty sure this engine is for a Challenger (as per the PN). I need to see a picture of how the flywheel is supposed to be.
             
          • Caterpillars

            Caterpillars FBBO Gold Member FBBO Gold Member

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            Copy of my post on page 2;

            "Well got my answer from Holly/Quicktime. There are two flywheels for the 5.7 and most likely the 6.1 and 6.4. The trucks motors have the starters on the drivers side and the ring gear on the flywheel is on the side of the tranny. Car motors have starter on passenger side and the ring gear is towards the motor. Make sure you check this because the crate motor that I have has the truck flywheel, and I have the "8076" bell housing which puts the starter on the passenger side. This is very important because it all bolts together and everything looks great until you try and start it. Now I have to take it all apart and replace the flywheel - what a bummer...."

            I don't know if this post is correct or if someone just put the ring gear on wrong. I talked to the person that set up the flywheel and he told me it was requested that way for some reason. It would be interesting to see if the truck motor or the set up with the starter on the drivers side has the ring gear towards the motor.

            If you happen to have a flywheel with the gear on the wrong side don't do like I did and run out and buy a new one for over $300. It's not that hard to change them around.


            Here is my old/new flywheel - notice the gear is towards the tranny side. By the way if someone needs a good deal on a flywheel let me know...

            fly1.JPG fly2.JPG fly3.JPG
             
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            • 70chall440

              70chall440 FBBO Gold Member FBBO Gold Member

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              Thank you very much for posting that, I had read your thread but that video really helped.

              Seems that we are going to opposite problems which will require the same procedure. I am not sure if I will do this or get another one, I realize it seems foolish to spend money needlessly but I need to do a lot more research to determine what I need to run for a pressure plate and clutch as well and I need to make sure they will work with whatever flywheel I have.
               
            • Caterpillars

              Caterpillars FBBO Gold Member FBBO Gold Member

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            • tallhair

              tallhair Rufus "Mod-hair" Firefly Staff Member

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            • tallhair

              tallhair Rufus "Mod-hair" Firefly Staff Member

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              Just finished your thread, nice build.
               
            • Caterpillars

              Caterpillars FBBO Gold Member FBBO Gold Member

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              Someone asked me if it had Posi (sure grip). Told them I'd have to check! posi.jpg
               
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              • Caterpillars

                Caterpillars FBBO Gold Member FBBO Gold Member

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                oops, didn't do that with Road Runner. Will see if it will match - pictures to follow.
                IMG_7342.JPG
                 
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