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Results 1 to 11 of 11

Thread: GM V8 repower

  1. #1
    Join Date
    Sep 2010
    Location
    South Wales, UK
    Posts
    163

    Default GM V8 repower

    Hi all, would a GM 6.2l diesel fit in the same engine bay as an OMC 5.7l petrol?
    If so, how much heavier is the diesel compared to the petrol?
    Also your thoughts on the above change?
    Is the block the same on the both engines, ie are they the same GM based engines
    Thanks Nick

  2. #2
    Join Date
    Dec 2006
    Location
    Chaumont Bay, N.y., USA
    Posts
    4,244

    Default Re: GM V8 repower

    Ayuh,... The 6.2 diesel shares pretty much Nothing with the 5.7 gasser....

    The 6.2 has been used as a boat motor though...
    It's closer to the BBC...
    Any Grease is Better,... Than No grease at All....

  3. #3
    Join Date
    Sep 2010
    Location
    South Wales, UK
    Posts
    163

    Default Re: GM V8 repower

    Dont know what BBC is or what it stands for
    Just wanted to know if the weight and physical size were similar to determine if it would be feasible to swap, also wondered if the blocks were the same(just out of curiosity as they are both gm based)
    Regards Nick

  4. #4
    Join Date
    Dec 2006
    Location
    Chaumont Bay, N.y., USA
    Posts
    4,244

    Default Re: GM V8 repower

    Quote Originally Posted by welshswampy View Post
    Dont know what BBC is or what it stands for
    Just wanted to know if the weight and physical size were similar to determine if it would be feasible to swap, also wondered if the blocks were the same(just out of curiosity as they are both gm based)
    Regards Nick
    Ayuh,... BBC = Big Block Chevy.....

    No, not the same,... slightly longer, 'n wider... though motorbox size isn't the issue...
    weight, I'd guess at 100 to 200 more...
    Any Grease is Better,... Than No grease at All....

  5. #5
    Join Date
    Sep 2010
    Location
    South Wales, UK
    Posts
    163

    Default Re: GM V8 repower

    Thanks Bondo, I assume you mean 100 to 200lb's, if thats the case then its gunna be too heavy
    Cheers anyway, Nick

  6. #6
    Join Date
    Dec 2006
    Location
    Chaumont Bay, N.y., USA
    Posts
    4,244

    Default Re: GM V8 repower

    Ayuh,... yes, pounds Nick...

    Good luck with yer project....

    Bein' a Diesel kinda guy myself, here in the States, an Easy diesel swap just ain't in the cards....
    I've looked into the GM 6.2, 'n the Navistar/ Ford 7.3s,....
    Neither is cheap, nor easy....
    Any Grease is Better,... Than No grease at All....

  7. #7
    Join Date
    Sep 2010
    Location
    South Wales, UK
    Posts
    163

    Default Re: GM V8 repower

    Picked up a GM v8 diesel and a VP 290 DP a few days ago, this one has cast aluminium manis and risers, so is only about 30/40 Kilos heavier overall than the petrol engine, so I'm gonna give it a go
    Will post at various stages of the project ( just so you can all thank the lord that its not you in my shoes)
    Regards Nick

  8. #8
    Join Date
    Dec 2011
    Location
    Left Coast
    Posts
    186

    Default Re: GM V8 repower

    Quote Originally Posted by welshswampy View Post
    ( just so you can all thank the lord that its not you in my shoes)
    Regards Nick
    I do everyday, especially with what they charge you for fuel over there!
    Cheers,
    Rev Bob

    "if it's gonna happen, it'll happen out there!"


    My Dad always said; "Everything on your boat is either broken or about to be.......and you just don't know about it yet".

  9. #9
    Join Date
    Sep 2010
    Location
    South Wales, UK
    Posts
    163

    Default Re: GM V8 repower

    any one know the torque setting for a gm v8 6.2l diesel big end bearings

  10. #10
    Join Date
    Sep 2010
    Location
    South Wales, UK
    Posts
    163

    Default Re: GM V8 repower

    Anyone tell me the procedure for fitting a replacement engine and transom plate
    Does the transom plate get fitted first, then fit the engine to suit?
    If so, what height above bottom of boat does the transom plate sit (I havent got a lot of room to play with)

    Regards Nick

  11. #11
    Join Date
    Sep 2010
    Location
    South Wales, UK
    Posts
    163

    Default Re: GM V8 repower

    For anyone thats interested repower now complete,the engine went in sweet as a nut on original stringers as did the new transom shield etc, reused a lot of the original OMC parts (trim pump,power steering pump and ram, throttle cable, although gear cable was renewed as it was too short to reach outdrive) needed to make some new brackets for the power steering ram, power steering pump and a bracket for the throttle cable near the fuel pump
    Went with 3" thru hull exhausts as I couldnt find the "Y" exhaust pipe over here, also had read about possible back pressure issues with these engines/Y exhausts
    All in all it was a sucessful project, and one I could recommend
    The boat doesnt sit any lower in the water whatsoever ( think this is due to using the alliminium manis and risers and reducing the size of the fuel tank)
    My biggest problem is reshaping the engine cover that had to be cut on the sides to accomodate the risers and the front to miss the power steering pump and heat exchanger water pipes, have extended the sides and front using 4mm plyboard which has been glassed in place and now need to be filled,primed and painted
    I really wish the painting fairies would pay me a visit overnight !!
    Couple of minor issues, dont know which terminal on the alternator to connect the rev counter wire and just connected the gear shift cable straight to the gear linkage on the out drive without checking rotation, now gears are opposite to control lever, can I change this on the throttle control lever linkage? if not it can wait til the boat next comes out of the water
    If anyone is interested I can post some photos
    Many thanks for all your help/advice
    Nick

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