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Factory air cleaner wing nut thread size?
Posted by: Duane1967 ()
Date: March 27, 2012 04:26AM

OK, I searched for 5 minutes, and found nothing. I lost/misplaced the wing nut
on my 67 2 carb original air cleaner. I figured it would be a 1/4 - 20 thread and when going to a couple of stores to get a new one, the 1/4 - 20 doesn't fit.

What is the thread size for this wing nut? The threads on the stud don't look jacked up, and the one I lost fit just fine.

Thanks for getting me back on thread!

Duane
1967 500 Coupe
Folsom, CA (Sacramento suburb)


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Re: Factory air cleaner wing nut thread size?
Posted by: Vairismo ()
Date: March 27, 2012 04:33AM

How much does it not fit? Are the threads damaged on either the strud or the new wingnut?
The new nut fits on another known 1/4-20 bolt? Just going through some thoughts.

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Re: Factory air cleaner wing nut thread size?
Posted by: Duane1967 ()
Date: March 27, 2012 04:45AM

I lost/misplaced the wing nut. So I got a 1/4-20 nut to check the size and it goes on about one turn, then binds. That same nut fits on a known 1/4 - 20 bolt. I tried a 1/4-28 and it doesn't even start. Both the nuts were new and fit on a corresponding threaded bolt. The threads on the air cleaner stud don't really look jacked up. But what other size could it be. Just for grins, tried a m6 and m7. First too small, 2nd too big.

Before rethreading the stud I wanted to know if anyone can confirm that it's supposed to be a 1/4 - 20 thread size.

Duane
1967 500 Coupe
Folsom, CA (Sacramento suburb)


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Re: Factory air cleaner wing nut thread size?
Posted by: MattNall ()
Date: March 27, 2012 05:03AM

Seems like I've seen an awful lot of 1/4-20 nuts on the studs..





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Re: Factory air cleaner wing nut thread size?
Posted by: vairchet ()
Date: March 27, 2012 08:35AM

Every OEM early and late air cleaner mounting stud that I have are 1/4"-20.

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Re: Factory air cleaner wing nut thread size?
Posted by: 4carbcorvair ()
Date: March 27, 2012 11:44AM

1/4x18?

--------------------------------
Ronnie
Southern Maine.
[www.dirigocorvairs.com]
66 Corsa Convertible, 140, 4sp.




It doesn't leak, it's marking it's territory.

A mirror is a reflection of the miles travelled.

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Re: Factory air cleaner wing nut thread size?
Posted by: steve c goodman ()
Date: March 27, 2012 01:16PM

It is 1/4x20. Probably your old wing nut got well used through the years. Just run a thread chaser over the stud and a new wing nut.

Sincere regards, Steve

1962 spyder 3.0L turbo 1967 monza 110/4
1968 monza 110/4 1971 amante gt 110/4

Golden, Colo. CORSA/RMC/PPCC

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Re: Factory air cleaner wing nut thread size?
Posted by: 4carbcorvair ()
Date: March 27, 2012 05:33PM

Or someone replaced the threaded rod with a different thread pitch?

--------------------------------
Ronnie
Southern Maine.
[www.dirigocorvairs.com]
66 Corsa Convertible, 140, 4sp.




It doesn't leak, it's marking it's territory.

A mirror is a reflection of the miles travelled.

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Re: Factory air cleaner wing nut thread size?
Posted by: Duane1967 ()
Date: March 28, 2012 04:25AM

It has to be a 1/4 - 20. I'll run a threader over it a remake it a new 1/4 - 20 again. Weird how the wing nut I lost fit on it so easily without any resistance.

Score, search, Life is good!

Duane
1967 500 Coupe
Folsom, CA (Sacramento suburb)


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Re: Factory air cleaner wing nut thread size?
Date: March 28, 2012 03:02PM

It sounds like your new wing nut is the "international standard"
Try running a tap thru the wingnut and leave the original stud alone.
Your original will probably turn up when you take the top shroud off!!



Dan Davis - Seattle ~ CORSA Western Director + Corvairs NW + North Cascades Corvairs + Corvanatics
1966 Corsa Turbo coupe ~ ~ 1966 140 Corsa ~ 65 Monza 140/4 'Vert Sierra Tan/Fawn (my current driver!!)
~ 1964 Monza 'Vert ~ 65 Monza 140/4 Evening Orchid w/ ivory/black int ~ 1962 Monza Wagon 102/4
1963 Rampside/Scamper ~ 1963 Red/Greenbrier ~ 1969 Ultra Van #468

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