Exhaust - Manifold-to-Cat Studs | Ford Escort Owners Association (FEOA)
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Exhaust Manifold-to-Cat Studs

Discussion in '1st Gen 1981-1990 CVH' started by ryan42, Jul 24, 2020.

  1. ryan42

    ryan42 FEOA Donator

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    Hi folks. I'm getting my wagon back on the road after a year of sitting in the weeds and I'm sourcing the two studs that go into the manifold and hold the catalytic converter on. I could walk into the auto parts house and buy 'em off the shelf, but virus etc., I'm trying to order them online with the thousand other parts I'm getting. I pulled out the calipers and sized them as 3/8 - 16 TPI but for whatever reason was looking to see if a kit was on RockAuto and found this manifold kit instead: https://www.rockauto.com/en/moreinfo.php?pk=274880&cc=1119103&jsn=2530

    Pictured are two studs which would seem to be for the manifold-to-converter attachment but they look nothing like what is on my car. I just have two normal exhaust studs like you'd thread in a cylinder head for the manifold attachment, with roughly 2-1/4 inches of total threaded length. If I had studs that looked like that I'd not be able to get the converter bolted down to within an inch of the manifold.

    And so I wonder: what did this look like originally? Were there springs there that someone before me did away with, similar to the flange joint after the converter? Those studs in the image look a full inch longer than what I have now. I'd not even be able to clear them as the left stud I took off already sat 1/4 inch from the A/C hard line. I had to unbolt the A/C compressor from the engine to remove the nut as it were.

    All the best!
  2. austin86

    austin86 That nut who spends way to much on a escort.

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    I might have some, let me look. if I do they are yours for the cost of shipping.
    I'll need a photo of what I'm looking for though, all my spare escort bolts are in a bucket and not sorted.
  3. ryan42

    ryan42 FEOA Donator

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    Thanks austin86! I guess I'm not really sure what I'm looking for though. Now that you mention it I probably have some regular 3/8-16 double-ended studs like what I removed in my big bucket o' car bolts too, but that picture in the RockAuto link makes me think I may be missing a fair bit of additional hardware that I'm not even sure what looks like.
  4. austin86

    austin86 That nut who spends way to much on a escort.

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    I vaguely recall there being springs on the studs to prevent crushing the donuts on the manifold. I'll take a look in my parts box in the garage.
  5. austin86

    austin86 That nut who spends way to much on a escort.

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    Ok, found my old stock manifold. It still has the studs on it and they look just like the ones in the rock auto listening. But I didn’t find the nuts or springs. Ill look again as I still have a few other parts to dig out.
  6. denisond3

    denisond3 Moderator Staff Member

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    Are there SAE bolts/nuts on the first gen Escorts? On a 2nd gen those would be M10-1.5. I have unscrewed the original studs on a couple of my Escorts, and used old head bolts - sawed off with a hacksaw where the threads started.
  7. Joey_Twowagons

    Joey_Twowagons FEOA Member

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    They will be metric studs as Denisond has suggested.
    10mm is 0.393", so just a smidge over 3/8".
    The nuts will probably be 14mm, which is only a few thousandths over 9/16".
  8. ryan42

    ryan42 FEOA Donator

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    Thanks for the warning! I double checked the old studs and they do seem to be 3/8" so whoever worked on it last must have misidentified them. I cleaned up the holes with a M10x1.5 tap this morning and threaded in new studs and hardware and it all seems to be holding fine with no leaks. I must have the wrong low pressure hard line for the factory A/C because those long studs and springs wouldn't come close to clearing it but it seems to be okay with rigid hardware, at least for the time being. If it causes a problem in the future I'll have to bend that low pressure line to clear the correct hardware.

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