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Author Topic: Correct inner shaft / block / block housing  (Read 214 times)
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impaw
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Posts: 76


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« on: 12 September, 2021, 09:01:04 PM »

Hello,
Cleaning up the rear inner joints, I noticed they are of different vintage.
The shaft, blocks and block housing are all different.
Which type is correct for a 4th series B20?
Thank you


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Torstein

1955 Aurelia B20
1966 Fulvia
1966 Fulvia rally/race car
impaw
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« Reply #1 on: 13 September, 2021, 10:00:31 AM »

Found the info in the parts book ( of course)  Cheesy


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Torstein

1955 Aurelia B20
1966 Fulvia
1966 Fulvia rally/race car
GG
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B20 s.2, Appia C10 unrestored


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« Reply #2 on: 13 September, 2021, 12:16:33 PM »

what were the red X ones for? Berlinas?
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B20 s.2, Appia C10 unrestored
impaw
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« Reply #3 on: 13 September, 2021, 03:10:54 PM »

I am not sure Geoff, but one of the X parts were stamped 1951.
The correct block housing for my car was stamped 1955.
Could it simply be a s1 vs s2 difference?
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Torstein

1955 Aurelia B20
1966 Fulvia
1966 Fulvia rally/race car
chriswgawne
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« Reply #4 on: 13 September, 2021, 04:52:53 PM »

I think the detail design evolved over time including production for Flaminias. Cavalitto sells new cages today which I believe to be OE Flaminia and his new blocks have the greater number of oil grooves.
I think the detail design of the pot joint inner drive shafts probably evolved in the same way that the outer drive shafts changed from being two components bolted together to being one piece.
For some reason I also think that there was an independent - i.e. non factory -   supplier of the blocks with the smaller number of oil grooves.
From choice I therefore always fit blocks with the larger number of oil channels.
Chris
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Chris Gawne
Mobile: 07778 216552
impaw
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« Reply #5 on: 13 September, 2021, 04:57:02 PM »

Yes, Enrico shipped me a new set today:)
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Torstein

1955 Aurelia B20
1966 Fulvia
1966 Fulvia rally/race car
GG
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B20 s.2, Appia C10 unrestored


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« Reply #6 on: 13 September, 2021, 05:10:36 PM »

Chris - thanks for the info... Are the parts (cages, shafts, blocks) interchangeable between different Aurelia models, and even Flaminias?
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B20 s.2, Appia C10 unrestored
impaw
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« Reply #7 on: 13 September, 2021, 05:38:59 PM »

Not that it is proof of improved design, but the blocks with fewer oil grooves and its house had signs of failure;
Deep wear marks in the house.
Perhaps a sign of poor lubrication - or simply poor maintenance
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Torstein

1955 Aurelia B20
1966 Fulvia
1966 Fulvia rally/race car
chriswgawne
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Posts: 1722



« Reply #8 on: 14 September, 2021, 10:41:08 PM »

Everything is interchangeable regarding pot joints to Thebes of my knowledge.
I have unwanted new internal parts for sale as well as a few rebuilt complete pot joints with new ro!lers.
Chris
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Chris Gawne
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Brian Long
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« Reply #9 on: 15 September, 2021, 04:09:21 AM »


'
...and to add to some of the differences, an 'L' cross-section carrier ring was sometimes used to support the 'lip' of the gaiter inside the pot joint housing to prevent it from being squeezed out.

Also, years ago I got some new 'cross-pieces' for the outer joints from Tom Sheehan. They had no grease nipple tapping. Turns out that they are the same as the ones  in the Flaminia inner pot joint and need to be drilled and tapped to take the nipple when used on an Aurelia.

Brian L.
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