[SCG] Idler Pulley Bracket Attaching Hardware Questions

[FrankDuVal]

Always seen pivot is a 3/8-16 bolt and the slide adjustment is a stud 
with 3/8-24 threads. 1960  to 1969.

People out west used to buy 3/8-24 coupler nuts (rod coupling nuts) and 
use them to replace the stock nut on the adjustment so a regular wrench 
would fit.

The "double end stud" has 3/8-16 threads on the part that goes into the 
oil filter/ Delcotron adapter, and 3/8-24 threads on the end that fits 
through the idler slot.

Never seen stud on pivot.

Washer on pivot is normal SAE flat washer with split lock washer. Have 
seen them without lock washer.

Washer on adjustment slot is more like fender washer, to cover the slot 
better, then usually an SAE flat washer, split lock and the nut.

This would be the real question, fender plus flat or flat alone on 
adjustment (before and after belt guard introduction), and then SAE flat 
on pivot bolt after introduction of belt guard?

Frank DuVal

On 3/8/2019 9:16 AM, William Hubbell via SCG-list wrote:
> On Mar 6, 2019, at 7:07 PM, Russell Davis <bluechipmach.rd at gmail.com> wrote:
>
> Good evening Bill, I'm wondering if you could offer some assistance to me.I'm gathering some info on the idler bracket,mainly the alt/generator/ oil filter housing that the idler bracket bolts to.I know there is a double ended stud on the slotted end that mounts in the alt/gen housing. But do have any info on the pivot end of that bracket. Did some use a stud and some use a bolt? Also was there a flat washer and a lock on the pivot end ? How about the slotted end did it take a flat washer and a lock? Any info you may offer would be much appreciated
>
> Bill Hubbell replies:
>
> Hmm.  This is an interesting question.
>
> Let me start by saying that I have always seen them with the pivot end having a bolt with lock and flat washers, while the slotted end was always a stud with nut, lock, and flat washers.  However, I mostly work with ‘64s and to be truthful, I haven’t really paid much attention to it.
>
> So far as I can tell, this was never addressed in Larry Claypool’s “Stock Is...” series.
>
> The shop manuals are no help, so I turned to the Assembly manuals.  I have one for each of the first 6 years (60-65)
>
> The assembly manuals for 60, 61, 62, 63  all refer to both as “adjusting nut” and the drawings appear to be nuts on studs, but the drawing is not detailed enough to make out what, if anything, is under the nuts.
>
> The 64 assembly manual is vague. It uses a revised drawing of the pulley, due the addition of the belt guide, is even more vague than the earlier guides, but the text still refers to both as “adjusting nut”.  However, on the same page, the Tensioning Procedure note refers to them as “Idler Pulley adjusting bolts”, so this is confusing.
>
> The 65 assembly manual refers to both of them as “idler pulley adjusting bolts” and that is how they appear in the drawing.
>
> So, in conclusion - I don’t know!
>
> Time for a survey and some help from our experts as copied on this reply.
>
> Bill Hubbell
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