[SCG] Idler Pulley Bracket Attaching Hardware Questions

[WADE]

It seems in the GM Corvair parts catalog that three stud sizes are listed as 0.003, 0.006 & 0.009 oversize at the adjustment slot location.  See
 attachments.  It didn't see anything about the pivot location.

Wade Lanning


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-----Original Message-----

From: scg-list at corvair.org
To: scg-list at corvair.org
Sent: 2019-03-10 5:18:40 PM 
Subject: Re: [SCG] Idler Pulley Bracket Attaching Hardware Questions

After taking a walk I see I need to change my replies to this question.

I now see threaded rod as a pivot on several examples.

The first is an engine that came out of a 63 convertible, a GM 
replacement engine, with the side hole for FC oil stick installation. 
Probably installed in the late 60s, car was totalled in the early 70s.

The other two examples are 1966 factory AC cars, one 95, the other 110 
HP. Both of these have studs in both locations.

Frank DuVal

On 3/8/2019 8:11 PM, FrankDuVal via SCG-list wrote:
> 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.
>
> 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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