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This is a older tractor. My question relates to the fuel system. The older fuel injectors don't have any external seals? All of them seat and 3 don't leak but one does.

I was looking for a seal but it didn't have any not even on the tip. So I'm wondering if they have a torque spec or how does it use a pressurized fuel system with no o-rings or gasket?

For those interested in specific application type: motor casting number # D5NN6015H

This places it in 75'

MODEL #LA254(6)(G)(C)(last digit maybe) Production #8H22B Serial # c580840

enter image description here

JPhi1618
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Dee
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    What year is that bad boy? – DucatiKiller Jan 18 '16 at 04:42
  • Not sure but think 65 70s – Dee Jan 18 '16 at 06:27
  • Maybe you could find a serial number to identify it. Is this a diesel? – DucatiKiller Jan 18 '16 at 06:29
  • Yes diesel.. I will divide a serial number tomorrow night PST.... – Dee Jan 18 '16 at 06:45
  • https://www.google.com/imgres?imgurl=http://d323w7klwy72q3.cloudfront.net/i/a/2014/20140226ag/F8165.JPG&imgrefurl=http://www.purplewave.com/cgi-bin/mnlist.cgi?140226/F8165&h=690&w=758&tbnid=ELf2_SwaiEJDEM:&docid=iO39_fwDmvES4M&hl=en&ei=STCdVvXbJsmwjwOz17eoCA&tbm=isch&client=safari&ved=0ahUKEwi1pL6QgLTKAhVJ2GMKHbPrDYUQMwgfKAMwAw – Dee Jan 18 '16 at 18:35
  • Above is the same tractor.... – Dee Jan 18 '16 at 18:36
  • No prob. Hopefully your question gets swarmed. – DucatiKiller Jan 19 '16 at 05:41
  • I think a picture is needed here. Does the injector look like this? – Zaid Jan 19 '16 at 06:44
  • http://www.ebay.com/bhp/ford-tractor-injector This is a link to the injector type.... Still can't figure out this picture bit... – Dee Jan 19 '16 at 08:03
  • While not the same, I had to put an 8-71 Detroit Diesel once. I don't remember the injectors having seals in them, but they did require a specific torque (I over torqued them the first time, so remember this vividly). What I'm suggesting is this might be the same way. – Pᴀᴜʟsᴛᴇʀ2 Mar 09 '16 at 00:06
  • Where is it leaking at? Where the injector lines go in to the injector? Or at the base? – Pᴀᴜʟsᴛᴇʀ2 Mar 26 '16 at 00:59
  • While the answer below is true for some machines, this does seam odd. Heavy equipment back to the '50s has had small brass watchers. I would check with your Ford dealer to get information on this model. – Jonathan Musso Apr 16 '16 at 12:29

1 Answers1

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What you are seeing is the use of fit type to form a positive seal. Older vehicles used harder materials (not to be mistaken for toughness or strength) for most parts. As a result it was possible to use an interference fit or a transition fit to form a seal. Attached is an image explaining this. Essentially, the fit is literally to tight for any fluid to flow through.

enter image description here

krthkskmr
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