48 Sedanette install 472-TH400
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500, 472, 425, 368 Discussion, 48 Sedanette install 472-TH400 in Cadillac Engine Technical Discussion; I have a 48 Sedanette that I'm restoring and will be installing a 71-73 472 engine and a TH 400 ...
  1. #1
    Don East is offline Cadillac Owners Member
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    Question 48 Sedanette install 472-TH400

    I have a 48 Sedanette that I'm restoring and will be installing a 71-73 472 engine and a TH 400 transmission. I'm currently working on the 472 rebuild. This is the first time to restore this engine. If there is anyone in this forum that has made a similar engine swap, I'd like to discuss your experience. I'm also new to this forum so would like suggestions to items in this forum I should review. My first specific question to this engine follows: The timing gear had what I would call ex-stream wear. The top of the gear teeth on the cam gear were reduced to points. Any suggestions at why or what would have caused this ex-stream wear?

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    BRUCE ROE is offline Cadillac Owners Fanatic
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    48 Sedanette install 472-TH400

    Those timing chain sets are famous for that failure mode. The original cam sprocket had plastic teeth, which may fall off any time at this age. Just put on an all steel roller timing set and forget those problems.

    A TH400 trans this age also has failure possibilities. The seals (on the pistons that drive the clutches that connect the motor to the wheels) age and may let clutches slip, with disastrous results. Bruce Roe

  4. #3
    Don East is offline Cadillac Owners Member
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    Re: 48 Sedanette install 472-TH400

    Brice, thanks for the reply. I didn't mention that I forund all kinds of plastic pieces in the oil pickup. Now I now where they came from. I plan on having the trans rebuilt.
    Don

  5. #4
    creeker is offline Cadillac Owners Connoisseur
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    Re: 48 Sedanette install 472-TH400

    Can you send any pics. of your car?.

  6. #5
    Don East is offline Cadillac Owners Member
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    Re: 48 Sedanette install 472-TH400

    This engine was loaded with carbon. My guess is the timing gear was largely responsible for this. I've miked the rods and main bearings. the rods were 1.5 clearance. That seems good. The mains were 2 to 3 clearance. That seems to be high. What do you all think? There is a very small ridge in the top of the cylinders. I'm considering putting in a new timing gear set and putting the engine back to gather. The person I bought the engine from thought maybe the engine had about 80,000 on it when it was removed. I'd like all the input and comments I can get. So fire away!! I also have a source for a fuel injection system for this car. Its the type that showed up on Cadillacs after 1975. I'm also open for motor mount suggestions.
    Thanks Don
    I'll include some pictures in the next post.
    If there is interest I'll create a photo and comment section of the build progress.

  7. #6
    Don East is offline Cadillac Owners Member
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    Re: 48 Sedanette install 472-TH400

    Quote Originally Posted by creeker View Post
    Can you send any pics. of your car?.
    Here is a photo of the 48 Caddy project. The shot also shows the 33 Chevy project.[IMG][/IMG]

  8. #7
    Don East is offline Cadillac Owners Member
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    Re: 48 Sedanette install 472-TH400

    Photo of 48 Caddy and 33 Chevy projects.
    Not sure how to include pictures. I'll give this a try.

  9. #8
    BRUCE ROE is offline Cadillac Owners Fanatic
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    48 Sedanette install 472-TH400

    Those 70s open loop Electronic Fuel Injection have reliability problems, and little advantage over a Qjet. Not recommended for new installations. An approach some people use, is to adapt a modern closed loop EFI to work with the 70s intake manifold/injectors/throttle body. The 70s GMC motorhome people have done a lot with EFI 403/455/500 engines. You can see some info on 70s EFI on my PHOTOBUCKET.

    http://s93.photobucket.com/albums/l71/bcroe/

    (that is a lower case "L"71, not an upper case "i"71)

    click on an Album at left
    click on a picture to enlarge + description

    Bruce Roe

  10. #9
    Don East is offline Cadillac Owners Member
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    Re: 48 Sedanette install 472-TH400

    Bruce, thanks for the information. Do you know of anyplace where I can find more information on this work?
    Don

  11. #10
    BRUCE ROE is offline Cadillac Owners Fanatic
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    48 Sedanette install 472-TH400

    I don't have websites handy, but try some searches on GMC MOTORHOMES, look for EFI. Russ Harms has a huge amount of info on his Old & Cad fuel injection conversions to modern closed loop, programable systems. There are also some MAF based systems that work with hardly any programing. good luck, Bruce Roe

  12. #11
    Don East is offline Cadillac Owners Member
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    Re: 48 Sedanette install 472-TH400

    Trying a picture link again. If this doesn't work can someone guide me to the instructions for doing this.
    Thanks.
    http://www.cadillacforums.com/forums/members/don-east-albums-48-cadillac-472-engine-swap-picture69334-48-cad-pano-800.html[/IMG]
    Attached Images

  13. #12
    Don East is offline Cadillac Owners Member
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    Red face Re: 48 Sedanette install 472-TH400

    Today engine torn down and ready for the machine shop.

  14. #13
    Don East is offline Cadillac Owners Member
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    Re: 48 Sedanette install 472-TH400

    Looking for suggestions: I want this car to be a driver. I'm going to replace the timing chain, cam, lifters, rocker arms and new bearings. I don't know about the pistons yet. This engine is the 71-72 type with soap dish pistons. It came with a quadrajet carb. My goal is to keep the cost down and as I said earlier create a good driver.

    What suggestions would you make for the parts I need. All suggestions will be considered.
    Thanks Don

  15. #14
    Don East is offline Cadillac Owners Member
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    Red face Re: 48 Sedanette install 472-TH400

    Going to pickup the block and engine parts today from the machine shop. The work begins.:

  16. #15
    deVille33 is offline Cadillac Owners Connoisseur
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    Re: 48 Sedanette install 472-TH400

    Be sure to open the oil pump and check the clearances. If you had the gear teeth in the pick-up screen, the pump may have starved.

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