Corvair DiagramCorvair Photo
Corvair Center
home forum corvairs calendar links Corvair Podcast
California Corvairs
Clarks Corvair
Clarks Corvair
“CORSA"



Chevy Corvair License Plate
Chevy Corvair Chrome Wheel
Corvair Center Forum :  Corvair Center Phorum The fastest message board... ever.
Corvair Center 
MANUAL Bell housings all years and Combinations
Posted by: MattNall ()
Date: August 06, 2018 07:55PM

Junkyard Primer says various things depending on the edition #

Steve Goodman says 3832176 is long stroke / 164's and 6256583 145's

Clarks says there are two! Bob Helt agrees with STEVE!
--------------------------------------------------------

Crank GEAR differences / use of Front main seal spacer?

Bob Helt says,

"There were three types of crankshaft gears used in the Corvair production. The first (Type 1) was used on the 1960-63 engines. The second (Type 2) was used for all engines 1964-69, except the 140-HP engines with Powerglide. This last version (Type 3) was used only on the 140-HP engines, and 1968-69 engines all with Powerglide. The second and third types allow for a relocation of the large crankshaft seal, by moving it rearward by 0.070". (Required because of the new clutch in 1964.)"
-----------------------------------------------------------------

Back to Bellhousings..


An early [ silver dollar ] can be used on a 164 engine RIGHT?

Can a LATE be used on a 145 / early? [ cam interference ]?

Any difference in Manual Crank Flanges? [ dimensional ]


Your KNOWLEDGE please!



Edited 1 time(s). Last edit at 08/08/2018 11:45AM by MattNall.

Options: ReplyQuote
Re: Question: What do you KNOW about MANUAL Bell housings all years!?
Posted by: davemotohead ()
Date: August 06, 2018 08:15PM

As I was told, the Bell housing follows the crank.





Email me at: Dave Motohead

1960 4dr sedan caveman car
1961 Rampside (Chetside)
1962 Rampside (Barnside)
1962 Short Rampside (Shortside)
1962 Monza 700 Wagon
1963 Monza 900 coup (General Nader)

-----------------------------------
Rust Free Lancaster Ca

Options: ReplyQuote
Re: Question: What do you KNOW about MANUAL Bell housings all years!?
Posted by: Frank DuVal ()
Date: August 06, 2018 09:28PM

Here is what I have gleaned over the years:

The 164 cid engine had the front crank seal moved 0.070 inches to the rear, which relocated the position of the seal on the hub.

Bell housings are identified by the cast-in numbers per the following table. the dollar sized imprint is on the EM housings.

MT PG
1960-63 6256583 6255599
1964-69 3832176 3832517

Late model FLYWHEELS have the stepped surface. LM pressure plates have the bent-fingers.
Hope this helps.



P/N for the 64/69 MT is: 3850975


The difference between early and late cranks is .070.
An early bell housing will have a half dollar size "dimple" in the face near
the cam and the part number will start with a "6".
A late bell housing doesn't have the dimple and the part number will start
with a 3.
Clark Hartzel

Only real functional difference is the location of the crank seal which on a
late bellhousing is maybe 3/16" closer to the engine. The late crank
sealing surface likewise is smaller. This was done to make room for the
revised flywheel and pressure plate. What this affects is how the crank
seal sits on the end of the crankshaft. If you have an late crank with an
early bellhousing, it puts the sealing lip really close to the edge of the
sealing surface on the crank. But, all is not lost. Clark's sells a shim
to go between bellhousing and the seal to reloacate it closer the the
engine. You could also just hunt down a late bellhousing.

Dan Kling

Hi Tim,
Well basically the PG bellhousings follow the revisions made to the MT
housings. Since the MT clutches were different for the 1960-63 and 1964-69, you
need to separate the PG bellhousings into these two groups too.
Then you should match the combinations of crank hub/flexplate and
bellhousing for either EM or LM.

The crank hubs are not easilly identified separately, but you can be pretty
much assured that the crank casting numbers will be a good identifier.
The flexplates can be identified in that the LM one has a 1/8 in hole in the
6-bolt circle.
The bellhousings can be identified by their casting numbers. EM=6255599,
LM=3832517.

OK, the answer to your question is.......
The main oil seal contact surface on the hub was relocated rearward by 0.070
in. on the LM bellhousing.

Regards,
Bob Helt

The part number for bell housings is not as simple as it seems.
Any number cast onto an item (cylinder heads, blocks, bell housings) is the
part number for the casting, not necessarily the machined part.
A bell housing with a cast number 625**** is definitely an early and the
late is 3832176. There is a gray area somewhere around 1963-64 when Chevy
started using the late casting for early machined parts. Those are
supposedly daubed with blue paint over the part number indicating an early
part. If the housing has been dipped or blasted the blue paint is gone and
you can't tell.
Here is a way to tell what you have: Measure the distance from the engine
mounting face to the seal flange surface. The early is .64 and the late is
.58 This difference has to do with the late longer stroke crank and stepped
face flywheel.
You can use an early bell housing on a late but you need an .06 thick spacer
under the flange on the seal. I have heard that a head gasket will work as
a spacer but I am not sure of that.
Clark Hartzel, former CPF Curator and keeper of the drawings.

Frank DuVal

Fredericksburg, VA



Edited 1 time(s). Last edit at 08/08/2018 11:32AM by MattNall.

Options: ReplyQuote
Re: Question: What do you KNOW about MANUAL Bell housings all years!?
Posted by: JimBrandberg ()
Date: August 08, 2018 07:10AM

My understanding is you need to use an Early bellhousing with an Early crankshaft and camshaft and a Late bellhousing with a Late crankshaft and camshaft.
The gear and seal surface on the crankshaft is different and the silver dollar recess in the bellhousing for the end of the camshaft is different.

My understanding is that you could use a Late camshaft with an Early crankshaft and Early bellhousing. The silver dollar recess would be there but doing nothing.
You can not use an Early camshaft with a Late crankshaft because the connecting rods will hit the wider lobes. The silver dollar recess is then a moot point.

My understanding is the Early and Late flywheel considerations are irrespective of the bellhousing.

Jim Brandberg
Isanti, MN
CorvairRepair.com

Options: ReplyQuote
Re: Question: What do you KNOW about MANUAL Bell housings all years!?
Posted by: MattNall ()
Date: August 08, 2018 08:03AM

Jim, so a early cam...where someone had ground the one lobe so the LATE crank would clear....and a LATE bellhousing would most likely hit? right??





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

Options: ReplyQuote
Re: Question: What do you KNOW about MANUAL Bell housings all years!?
Posted by: JimBrandberg ()
Date: August 08, 2018 08:52AM

Yes Matt I believe that is correct. Early cam needs that silver dollar recess in the bellhousing. Now if someone was going to all the trouble of grinding the cam lobes narrower to miss the connecting rods, I wonder if the end of the cam could be ground down as well...?

Jim Brandberg
Isanti, MN
CorvairRepair.com

Options: ReplyQuote
Re: Question: What do you KNOW about MANUAL Bell housings all years!?
Posted by: MattNall ()
Date: August 08, 2018 10:44AM

Thanks Jim! I figured that! I just wanted someone "professional" to state that without any "suggestion" from me!





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

Options: ReplyQuote
Re: Question: What do you KNOW about MANUAL Bell housings all years!?
Posted by: Vairismo ()
Date: August 08, 2018 03:26PM

Hard for me to believe this is a serious issue at all given the 50 odd years Corvairs have been being mixed and matched.
If it was a big issue then we would already be aware of it instead of asking the question (about interchanging) IMO.

Options: ReplyQuote
Re: Question: What do you KNOW about MANUAL Bell housings all years!?
Posted by: MattNall ()
Date: August 08, 2018 05:05PM

Not an issue, unless you have a engine that knocks only at low RPM and nothing is apparent!! gg





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

Options: ReplyQuote


Sorry, only registered users may post in this forum.
This forum powered by Phorum.