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Author Topic: Idler Arm 67-70 w/PS  (Read 6504 times)

Offline chockostang

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Idler Arm 67-70 w/PS
« on: December 19, 2020, 07:30:00 PM »
Has anyone seen a C8AA 3355 B Idler arm come off a 67-70 Mustang with Power Steering.
Yes, exactly in every detail/measure as the C7ZA 3355 B.
Very confused here???
« Last Edit: January 20, 2021, 04:00:41 PM by J_Speegle »
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Offline ruppstang

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Re: IDLER ARM
« Reply #1 on: December 30, 2020, 09:37:45 AM »
I found a C7ZA- 3355-B idler arm the upper shaft lock nut was missing. Does anyone have a source for them? It is a 9/16 -18 thread.
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Offline chockostang

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Re: IDLER ARM
« Reply #2 on: December 30, 2020, 10:30:00 AM »
Give me a call.

Dan
217 882 2083
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Offline jwc66k

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Re: IDLER ARM
« Reply #3 on: December 30, 2020, 02:18:57 PM »
Quote from: ruppstang on December 30, 2020, 09:37:45 AM
I found a C7ZA- 3355-B idler arm the upper shaft lock nut was missing. Does anyone have a source for them? It is a 9/16 -18 thread.
Did you look up the Ford part number for the nut?
Jim
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Offline ruppstang

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Re: IDLER ARM
« Reply #4 on: December 30, 2020, 05:39:25 PM »
Quote from: jwc66k on December 30, 2020, 02:18:57 PM
Did you look up the Ford part number for the nut?
Jim

The assembly manual did not have a part number for that nut, it did however did have a number for the lower nut. I think because the idler arm was a assembly it's parts were not broken down into Ford part numbers.
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Offline chockostang

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Re: IDLER ARM
« Reply #5 on: December 30, 2020, 05:54:11 PM »
There is no number for the Acorn nut guys.
Got several, if someone needs one, Just call! 
Dan
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Offline ruppstang

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Re: IDLER ARM
« Reply #6 on: December 30, 2020, 07:54:43 PM »
Thanks for your help Dan. I meant to say I have never have seen a C8AA 3355 B arm. Would the AA be from a big Ford?
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Offline jwc66k

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Re: IDLER ARM
« Reply #7 on: December 30, 2020, 08:41:23 PM »
Quote from: chockostang on December 30, 2020, 05:54:11 PM
There is no number for the Acorn nut guys.
Got several, if someone needs one, Just call! 
Dan
It's listed in Ford Car Parts (aka MPC), and it's a "castle" nut. The accompanying washer, 379297-S, is not serviced.
Jim
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Offline ruppstang

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Re: IDLER ARM
« Reply #8 on: December 30, 2020, 08:48:15 PM »
Quote from: jwc66k on December 30, 2020, 08:41:23 PM
It's listed in Ford Car Parts (aka MPC), and it's a "castle" nut. The accompanying washer, 379297-S, is not serviced.
Jim

Jim that is not the nut I need. I said that one is listed. It is the one that is dome shaped on the upper bushing. It is not listed.
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Offline Bob Gaines

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Re: IDLER ARM
« Reply #9 on: December 30, 2020, 08:59:36 PM »
The end of the stud is typically crimped so as to lock the nut in place .You have to grind away the crimp or risk stripping the nut as you try unthreading it.Sometimes it will come off without damage to the nut threads and sometimes not.
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Bob Gaines,Shelby enthusiast, Shelby collector , Shelby concours judge SAAC,MCA,Mid America Shelby

Offline jwc66k

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Re: IDLER ARM
« Reply #10 on: December 31, 2020, 01:05:35 AM »
It may be as shown in the illustration below, 377330-S, depending on the height, 0.359 inch. That same nut may be used on C4 transmissions for the manual control valve lever to it's shaft, which is referenced in the 75 Ford Car Parts (aka MPC) in Section A70.4 page 13.
Jim
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Offline chockostang

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Re: IDLER ARM
« Reply #11 on: December 31, 2020, 06:33:04 PM »
Yes the A is big car.  Puzzling aspect is I've never seen one, then it came off a 68 Mustang, it is in every way exactly same as the C7ZA 3355 B.
Zero reference in googling, searching for this.
Again, has anyone have info on this idler?
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Offline chockostang

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Re: IDLER ARM
« Reply #12 on: December 31, 2020, 06:35:05 PM »
ruppstang
Carol put 2 Acorns in mail today.
As Bob stated, yes the threads do get screwed up.
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Offline ruppstang

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Re: IDLER ARM
« Reply #13 on: January 01, 2021, 10:49:58 AM »
I have been wondering about the differences between the manual and power steering arms. I do not have a original manual to compare.

I know the shaft for a manual has a oval hole in it between the mounting holes where the power one has none. Was the hole for identification purposes? 

I know there is a difference in the lower bushings

Is the arm the same for PS and Manual? If so could you use a manual arm for PS by changing the lower bushing?
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Offline chockostang

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Re: IDLER ARM
« Reply #14 on: January 01, 2021, 11:09:11 AM »
The idler arms are all C7ZA 3355 B cast in the rail of the idler.  Everyone comes out the same.  The difference is the machining of the centerlink end hole in idler.
The manual hole is a few thousands larger than the PS.
A power steering bushing will fall in the hole of a manual idler.
Can a manual idler be used for PS.  Yes, create a shim that is the correct thickness to compensate the slop, press it in.   
As far as the oblong hole---Who knows why Ford made all the changes back then,  Remember it was the 60's where we had free love, free thinking, and LSD.  Maybe some of the Ford engineers experimented????
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