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

[William Hubbell]

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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