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  1. #1

    Join Date
    Jul 2001
    Posts
    4
    Location
    Northeast USA
    Tractor
    Ford 515

    Default Gas To Diesel

    I have a 1976 3 cyl Ford 515. Gasoline Model

    It appears from the service manual that the Block, Crank, Rods are all Exactly the same as the Diesel Model.

    I will be needing an overhaul very soon and was wondering if it would pay to find a head, injectors, plumbing and injector pump for this one to convert it to a diesel.

    Your thoughts and information would be appreciated!




  2. #2
    Platinum Member
    Join Date
    Jul 2000
    Posts
    588
    Location
    Augusta, AR
    Tractor
    05 CASE IH D35 W/FEL

    Default Re: Gas To Diesel

    Keith, anything can be done if you have enough money! You are looking at MAJOR bucks to do this. Do you know if the block has cutouts, bolt holes,ETC to accept an injector pump. Also the pump runs of the timing gears, I think you would have problems there.

    jim

  3. #3
    Epic Contributor
    R.I.P.
    jinman's Avatar
    Join Date
    Feb 2001
    Posts
    21,014
    Location
    Texas - Wise County - Sunset
    Tractor
    NHTC45D, NH LB75B, Ford Jubilee

    Default Re: Gas To Diesel

    I think you have missed something here. The compression ration on a diesel engine is typically 16:1 or 19:1 and a gasoline engine is typically 8:1. That is done with crankshaft stroke and piston construction. The pressures in the cylinder make it necessary to have different pistons and rings to hold the higher gas pressures. I just have strong doubts that your engine components are the same. I don't know for sure, but I think you need to check a little closer.

    JimI

  4. #4

    Join Date
    Sep 2000
    Posts
    1,862
    Location
    The Fabulous Foothills of Northern California

    Default Re: Gas To Diesel

    For that matter, many of the old indirect injections run at 22:1. Diesels typically have a larger cooling system and often times a larger current starter. I would think that with all that would have to go into making a gas a diesel, it might be simplier to go find a used diesel. By the way is this one of those yellowish and blue Fords? Rat...

    P.S. How about rebuilding this gas engine, selling it and getting a 4wd compact?


  5. #5
    Silver Member MODiesel's Avatar
    Join Date
    Jul 2001
    Posts
    206
    Location
    Missouri, USA
    Tractor
    Kubota L5030HSTC

    Default Re: Gas To Diesel

    Hi Keith!

    =)

    The guys here are right. Mucho dinero!!!

    Didn't know you were also a tractor guy. =]

    Best,
    Jay


  6. #6

    Join Date
    Jul 2001
    Posts
    4
    Location
    Northeast USA
    Tractor
    Ford 515

    Default Re: Gas To Diesel

    Jay,

    I just found out about this here. This was my first post.

    I am planning on a rebuild soon or as soon as the bucket stops working. I get lots and lots of wear metals in my oil analysis after only 50 hours time.

    Bore and Stroke are identical. 4.4 bore and 4.4 stroke for both.

    The timing gear for the distributor uses is the same gearing and mount for the diesel pump. I would need a pump and gear.

    I am not sure about the rods but according to the ford tech I spoke with they are exact too. He said the pistons differed. The book says the gasser has 3 compression rings and one oil control ring. The gasser has one less compression ring. With the exception of the additional ring the two pistons even look alike.

    I would be replacing pistons though as I will probably try 10 over if all looks ok in there.


    You guys are correct in that the starter is about a half inch larger!

    I never spoke to anyone about the camshaft but I was figuring to replace that as well on the rebuild. Even though the specs for this are identical to the gasser.

    Cooling system. The diesel and gasoline cooling system are the same size.

    It is certainly tempting !.

    I figure I will need pistons anyway because I will probably have to bore the cylinders to get rid of any taper. I hear piston slap already so I know it must be bored. There is a good chance the cam is toast too and it will need new lifters.

    I figure it might be possible to find a head and an intake manifold somewhere for this unit. Then some injectors and a pump. With that out of the way It would leave me with only a starter to find. I would have to rebuild the head on my current unit too so I was hoping I would offset some costs as long as I could find what I was looking for. This may be the needle in a hundred haystacks though.

    If the diesel by itself was cheaper or easier to find I would be very happy to go that route too.

    Rat
    It is a yellow ford not a blue one.

    It is an industrial tractor. with a Simms Cover and a Farm Factory Corporation Loader Materials Bucket.

    It can be seen here next to my other favorite Ford:
    http://www.ford-diesel.com/photos/getphoto.php3?262

    It is painted John Deere Yellow. Not my choice. I preferred the Ford color.




    Keith
    1976 Ford 515, 735 Loader with 753 Hoe<P ID="edit"><FONT SIZE=-1>Edited by Carpentractor on 07/30/01 03:37 PM (server time).</FONT></P>

  7. #7
    Super Member RobS's Avatar
    Join Date
    Jun 2000
    Posts
    6,703
    Location
    SW Michigan
    Tractor
    John Deere 790

    Default Re: Gas To Diesel

    Sounds like an interesting possibility. The compression ratio could come from just the pistons and the head. If you find a used head, it'll likely have a block, starter and various other things attached to it. There are a lot of tractor salvage yards around the country including one in Elkhart, Indiana near me. Let me know if you want a phone number [img]/w3tcompact/icons/smile.gif[/img]


  8. #8

    Join Date
    Jul 2001
    Posts
    4
    Location
    Northeast USA
    Tractor
    Ford 515

    Default Re: Gas To Diesel

    Rob,

    When I saw that the Compression Ratios for the diesel were only 16.3 to 1 for the Diesel and 7.75:1 for the gas the thought that it was only the pistons and the head went through my mind.

    Yes I would love that phone number


    Keith
    1976 Ford 515, 735 Loader with 753 Hoe

  9. #9
    Super Member RobS's Avatar
    Join Date
    Jun 2000
    Posts
    6,703
    Location
    SW Michigan
    Tractor
    John Deere 790

    Default Re: Gas To Diesel

    Keith, it's Myers Implement. Phone 219-294-1008. If they don't have anything they may have a list of other used dealers. Hope you find your needle in the haystack [img]/w3tcompact/icons/smile.gif[/img]


  10. #10
    Epic Contributor
    R.I.P.
    jinman's Avatar
    Join Date
    Feb 2001
    Posts
    21,014
    Location
    Texas - Wise County - Sunset
    Tractor
    NHTC45D, NH LB75B, Ford Jubilee

    Default Re: Gas To Diesel

    Wow! You must really love that tractor...almost as much as you love a challenge. Good luck.

    JimI

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