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When were belt guards added to Corvair engines?
Posted by: whubbell ()
Date: September 06, 2017 03:00PM

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,
President, Stock Corvair Group

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Re: When were belt guards added to Corvair engines?
Posted by: Joe West ()
Date: September 07, 2017 06:44PM

My 64 spyder with the stock engine was built in 07/1964 and it has both the front and rear guides.


1964 Spyder Convertible, Laurinburg North Carolina
Restoration Website: [www.corvairspyder.com]

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Re: When were belt guards added to Corvair engines?
Posted by: steve c goodman ()
Date: September 07, 2017 07:34PM

Larry Claypool devoted one of his 'stock is' columns to the exact date and vin break between no guide and guide. I remember there was always a conversation at convention concourse about the numbers. It would be discussed afterwards too in the letters to the editor in the COMMUNIQUE too.

best wishes, Steve
Rear Engine Spec. Inc. Golden, Colo.

1962 spyder 3.0L turbo---1965 Crown V8
1967 monza 110/4---1968 monza 110/4
1971 amante gt 110/4
CORSA/RMC/PPCC

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Re: When were belt guards added to Corvair engines?
Posted by: jbyenko77 ()
Date: September 07, 2017 07:57PM

My2nd week of September 64 spyder does not have belt guards

Jeff ballard
Camarillo CA

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Re: When were belt guards added to Corvair engines?
Posted by: whubbell ()
Date: September 07, 2017 08:04PM

Actually all that Larry said in his "Stock Is..." article is that the belt guards appeared in "mid-64" - no exact date or VIN number.

However, I just received confirmation from Dave Newell late last night (after my original post) that there was a TSB that stated "All Corvair Models produced after November 29, 1963, are equipped with subject guides to afford greater belt durability and to prevent belt roll-over."

Furthermore, Larry, Dave, and I have now reached a consensus opinion that the upper top shroud) belt guide was never used on 1964-64 air conditioned cars.

Bill Hubbell,
President, Stock Corvair Group

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Re: When were belt guards added to Corvair engines?
Posted by: Nickshu ()
Date: September 07, 2017 09:01PM

My 3rd week of September 1963 built 1964 Spyder does not have belt guides.

Nick
_______________________________________________________________________
1964 Monza Spyder Convertible #435 - Rotisserie restored - Check out my restoration thread here: [corvaircenter.com]
Recreational Mechanic/CORSA Member/COG Supporting Member/US Navy Veteran
Northern Colorado, USA

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Re: When were belt guards added to Corvair engines?
Posted by: Joe West ()
Date: September 08, 2017 05:08PM

You mean 1963, right?

jbyenko77 Wrote:
-------------------------------------------------------
> My2nd week of September 64 spyder does not have
> belt guards
>
> Jeff ballard
> Camarillo CA


1964 Spyder Convertible, Laurinburg North Carolina
Restoration Website: [www.corvairspyder.com]

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Re: When were belt guards added to Corvair engines?
Posted by: whubbell ()
Date: September 08, 2017 06:48PM

No, I think he means his '64 Spyder with a build date 2nd week of September 1963.

Bill Hubbell,
President, Stock Corvair Group

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Re: When were belt guards added to Corvair engines?
Posted by: illinicorsa ()
Date: February 11, 2018 06:53AM

I have not installed an idler pulley belt guide since 1969. But I need to put one on my '66. Does the guide fit directly under the two idler pulley bolt heads (which is what I'm guessing)? Or does it fit between the idler pulley bracket and the engine?

Steve
'66 Corsa

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Re: When were belt guards added to Corvair engines?
Posted by: junkman ()
Date: February 11, 2018 08:51AM

Posting build week and year is helpful, but it might be more helpful to also reference the date code of the engine build (if original engine), and the last 4 digits of the VIN. This will help to build a better data base for the future. Just my opinion, and others doing the work might disagree.

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Re: When were belt guards added to Corvair engines?
Posted by: MattNall ()
Date: February 11, 2018 09:00AM

illinicorsa Wrote:
-------------------------------------------------------
> I need to put one on my '66.
> Does the guide fit directly under the two idler
> pulley bolt heads (which is what I'm guessing)? Or
> does it fit between the idler pulley bracket and
> the engine?
=================================================================

Bolt heads





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