[SCG] (Second Try) Re: When did belt guards appear on 1964 Corvairs?

[larry at vairshop.com]

hi guys- just a note, i don't believe the a/c cars used the upper  
guard, it interfered with the condenser to upper shroud fitment. not  
sure about the rear guard. a look in the a/c installation instructions  
for dealer a/c may clarify.
lc

  Quoting William Hubbell <wjhubbell at gmail.com>:

> Dave - thanks so much for the information!
>
> Yes, I would be very interested in receiving a scanned copy of the  
> TSB 982 whenever you get time to do it.
>
> Thanks again!
>
> Bill
>
> On Sep 6, 2017, at 11:21 PM, David Newell <chevrobilia at yahoo.com> wrote:
>
> (Sorry for the incomplete first attempt...due to my eyesight my left  
> thumb sometimes hits the Control key instead of Shift and sends  
> emails before I've finished them!)
>
> Bill,
> Thanks for bringing up this interesting subject. I think you're  
> right, Bill, in that the 3-27-64 Assy Manual note simply revised the  
> existing drawing (which already showed the guards) and added a  
> dimension to it. I don't have the previous pages in my book, sorry.
>
> But I found TSB 982 which only went to the field and not to dealers:  
> "Corvair and Corvair 95 Blower Belt Front and Rear Guides" dated  
> 3-18-64. It states that "All Corvair Models produced after November  
> 29, 1963, are equipped with subject guides to afford greater belt  
> durability and to prevent belt roll-over."
>
> The primary purpose of the bulletin was to show how the guides could  
> be field installed on 61 through early 64 Corvairs. Four pages of  
> instructions and drawings were included, mostly devoted to  
> fabricating a bracket for the front guide and welding it to the top  
> shroud. If anyone's interested, the next time I have my laptop hard  
> wired to my non-Wifi scanner I can scan the bulletin for you.
>
> I checked the '64 GM Proving Ground Vair production test car photos  
> but the only one photographed after 11-29 was a non-A/C 927, shot on  
> 3-9-64, which had the guards. The others, including and A/C car,  
> didn't have them.
>
> I have one more source to check, the monthly quality reports, to see  
> if there are any comments about adding the guards as a fix for a  
> chronic quality issue. I can't find them right now though.
>
> Since no exclusions for A/C were mentioned in either the Assy Manual  
> or the bulletin, I can't see any reason to believe that '64 A/C cars  
> didn't use the brackets.
>
> Hope this helps,
> Dave
>
> --------------------------------------------
> On Wed, 9/6/17, William Hubbell <wjhubbell at gmail.com> wrote:
>
> Subject: Re: When did belt guards appear on 1964 Corvairs?
> To: larry at vairshop.com
> Cc: "Stock Corvair Group" <scg-list at corvair.org>, "Dave Newell"  
> <chevrobilia at yahoo.com>, "Larry Claypool" <vairshop at sbcglobal.net>
> Date: Wednesday, September 6, 2017, 4:40 PM
>
> Thanks Larry - I don't know why I didn't
> think of that!
>
> According to the 1964 Assembly Manual,
> Section 6, Sheet A4.00 titled "Belt and Belt Adjustment, on
> 3-27-64:
> Note 6 :  "View A Revised and Dim
> Added".  (View A shows the two guides and the
> dimensions for adjusting them)
> Note 7: "Dim Instructions Revised"
> (This refers to the dimensions for
> clearance from guide to top edge of pulley after belt is
> tightened)
> Note 8: "Tensioning Note Revised"
>
> I checked the 1963 Assembly Manual and
> there is a similar page for "Belt and Belt Adjustment ",
> Section 6 Sheet A 9.00.  The main photo on this sheet
> is nearly identical to the main photo in the 1964 manual,
> but View A is quite different and, of course, does not show
> belt guides.
>
> Therefore it is a possibility that the
> belt guides may have been added around 3-27-64, at the time
> View A and belt tensioning note was revised.  However,
> note 7 seems to suggest the possibility that there could
> have been an earlier version of view A showing the belt
> guides with a different clearance between the fan pulley and
> top shroud belt guide, so this date is not certain.
>
> I also checked the 1964 Assembly Manual
> Air Conditioning section but find no mention there of belt
> guides.  I rather suspect they were not added to the
> A/C engine but I'm really not sure about that.
>
> Bill
>
> On Sep 6, 2017, at 6:01 PM, larry at vairshop.com
> wrote:
>
> hi Bill
> as a starting point check the assembly
> manual and see what date is listed for the guards. that
> doesn't mean they entered production then, but it would
> *not* have entered production *before* then. rear refers to
> one at idler pulley, and yes they are guides.
>
> there may be a technical service
> bulletin that tells techs how to adjust these, and it may
> note when they came into production. i'll look when i get a
> chance, but it's not likely to be soon.
> larry
>
>
>
> mQuoting William Hubbell <wjhubbell at gmail.com>:
>
>> Do we know the approximate date
> when the top shroud and idler pulley belt guards were added
> to the Corvair engine?  Also, do we know if Early Air
> Conditioned cars used either of these guards?
>>
>> The guides definitely first
> appeared sometime in the 1964 model year, as there are two
> top shroud part numbers listed in the March 1, 1964
> Corvair-Chevy-Chevelle parts catalog:
>>
>> - 3794216 Shroud Assembly, Upper,
> 62-63 Corvair, FC, 64 Corvair (exc. Turbocharger) (1st
> design)
>> - 3851838 Shroud Shroud Assembly,
> Upper, Corvair, FC (exc. Spyder) (2nd design)
>>
>> There are likewise two part
> numbers for 64 Spyder top shroud:
>>
>> - 3848398 Shroud Assembly, Upper,
> 64 Corvair, Spyder (1st design)
>> - 3851840 Shroud Assembly, Upper,
> 64 Spyder (2nd design)
>>
>> There is apparently only one
> listing for 64 FC:
>>
>> - 3848400 Shroud Assembly, Upper,
> 64 FC
>>
>> Additionally, the index listing
> for "Guide, Blower belt idler pulley" points to section
> 1.060.  In that section I find the following:
>>
>> - 3851844 Guide, front, 64
> Corvair, FC (exc. Air Cond.)
>> - 3851845 Guide, rear, 64 Corvair,
> FC
>>
>> I'm not sure if "guide" is the
> belt guard.  If so, is the "front" the guide that goes
> on the upper shroud and "rear" the guide that goes on the
> idler pulley?
>>
>> The parts book does not list the
> dates for "1st design" and "2nd design" - do we have any
> idea when this change took place?   I already looked in
> my Clark's reproduction Chevrolet Service Bulletins and did
> not find anything, but as these are edited reproductions I
> might be missing the announcement.
>>
>> Bill Hubbell
>
>
>
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