[SCG] When did belt guards appear on 1964 Corvairs?

[William Hubbell]

Dave - your post appears to have been cut off mid-sentence.  Could you re-post?

Bill

On Sep 6, 2017, at 10:27 PM, David Newell <chevrobilia at yahoo.com> wrote:

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 showing 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 eq 
--------------------------------------------
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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