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

[William Hubbell]

Unfortunately the dealer instructions I have were written in 1962 - before the guards were added, and I don't have any update for 1964 nor any instructions for 1965.

I suppose I could take a condenser shroud and try setting it over my 1964 sedan engine w/belt guards to see what the clearance looks like. 

Bill

On Sep 7, 2017, at 7:47 AM, larry at vairshop.com wrote:

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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