Driveshaft bolts - Page 3 - Alfa Romeo Bulletin Board & Forums
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post #31 of 41 (permalink) Old 06-25-2016, 09:01 PM
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Oops. You may be right. 1600's had 8 mm bolts, 2L had 9mm shoulder bolts. I don't actually know what was in the middle set - the 1750's.

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post #32 of 41 (permalink) Old 06-26-2016, 05:05 AM
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Your brain is probably a similar age to mine!

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A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #33 of 41 (permalink) Old 06-27-2016, 07:14 AM Thread Starter
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So I received some bolts from a member here and took their measurements with my cheap digital caliper. They are 4 different types. All of them have 4F marking (does anyone know what they stand for?) followed by: A-10.9; B-100; C-10K; D-10K. The 3rd pic is from Centerline's website of there 8mm 10.9 bolts for 750/101/105 cars which are "on backorder". Hmmm....

Here come some more questions:

Were the original bolts made by Lobo?
Were the original nuts looking like the taller ones on centerline's pic?
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Last edited by Nakagtv; 06-27-2016 at 07:43 AM. Reason: missing pic
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post #34 of 41 (permalink) Old 06-27-2016, 08:17 AM
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The ones that I gave away were type C with nylock nuts.

Ed Prytherch
79 Spider
76 Suzuki GT500
2011 Jaguar XKR

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #35 of 41 (permalink) Old 06-27-2016, 08:34 AM
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Part numbers

Alfa bolt, part number 2100.20042 fits all 1750's plus certain 1300's and 1600's.
Part number # 2100.20218 fits all 2000's plus certain models of 1300's and 1600's.

Nut # 2120.20044 goes with bolt # 2100.20042
Nut # 115.09.01.168.00 goes with bolt # 2100.20218.

The same nuts are bolts are listed for both the center flange and the rear flange.

I would check with DiFatta Brothers and/or John Norman Alfa Parts for availability.
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Ed Prytherch
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A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #36 of 41 (permalink) Old 06-27-2016, 12:17 PM
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The 4F identifies the fastener manufacturer, in this case Fontana SA.
The part you marked as "B", with its 14 mm head, is a 750/101 era bolt, while the others are later. It matches the bolts on my 1960 Giulietta Spider.

I don't know if Alfa ever used Lobos in this location.

Joe
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post #37 of 41 (permalink) Old 06-28-2016, 06:55 AM Thread Starter
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Quote:
Originally Posted by alfaparticle View Post
Alfa bolt, part number 2100.20042 fits all 1750's plus certain 1300's and 1600's.
Part number # 2100.20218 fits all 2000's plus certain models of 1300's and 1600's.

Nut # 2120.20044 goes with bolt # 2100.20042
Nut # 115.09.01.168.00 goes with bolt # 2100.20218.

The same nuts are bolts are listed for both the center flange and the rear flange.

I would check with DiFatta Brothers and/or John Norman Alfa Parts for availability.

Thanks for looking up those numbers.

I called both of them, nothing.. they don't have them. APE's sending me four bolts though.

Lady at Jon Norman told me to show these bolts to some European auto parts suppliers and see if they have something similar.
This might be a long shot, but does anyone recall using 13mm wrenches working on a driveshaft or a differential on any other cars? How about 5/16s?


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Originally Posted by jkbartusek View Post
The 4F identifies the fastener manufacturer, in this case Fontana SA.
The part you marked as "B", with its 14 mm head, is a 750/101 era bolt, while the others are later. It matches the bolts on my 1960 Giulietta Spider.

I don't know if Alfa ever used Lobos in this location.

Joe
Good to know Joe, so we got one Giulietta's bolt. Do these have matching M8 nuts with 14mm heads?
Thing about Fontana SA group is that they owned majority of Italian and some non Italian fastener makers including Lobo FONTANA GRUPPO - Special Fasteners

Zaza

Current Alfas:

2018 Stelvio Ti Sport
1987 Milano Verde
1970 Euro-spec GTV 1750

Refreshing 1750 GTV
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post #38 of 41 (permalink) Old 06-28-2016, 07:36 AM Thread Starter
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Quote:
Originally Posted by alfaparticle View Post
The probability of shearing the bolts may be low but the consequences could be serious. RISK = PROBABILITY * CONSEQUENCE
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Originally Posted by Alfajay View Post
Nakagtv:

As Andrew points out, failures in this area are rare. But as alfaparticle points out, if your front flange did fail, allowing the shaft to whip, the result could be serious.
What if one added a bracket, made out of bottom horizontal part of the center bearing support few inches behind of the original. Would this be enough to stop front shaft from dropping all the way down and causing a catastrophy?

I know I'm busting *****, but everything else has been discussed at least twice on this board

Zaza

Current Alfas:

2018 Stelvio Ti Sport
1987 Milano Verde
1970 Euro-spec GTV 1750

Refreshing 1750 GTV
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Last edited by Nakagtv; 06-28-2016 at 07:38 AM.
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post #39 of 41 (permalink) Old 06-28-2016, 07:44 AM
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Quote:
What if one added a bracket, made out of bottom horizontal part of the center bearing support few inches behind of the original. Would this be enough to stop front shaft from dropping all the way down and causing a catastrophy?
That is no doubt the reason for the removable cross member under the front section. One ABB member came close to having his leg amputated when the Giubo let go.

Ed Prytherch
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76 Suzuki GT500
2011 Jaguar XKR

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #40 of 41 (permalink) Old 06-28-2016, 06:29 PM
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Summit Racing, Jegs, etc all have generic driveshaft safety hoops for drag and other race cars. I'm sure something could be adapted or fabbed up. I just today saw a tiny little hoop on a TZ, barely bigger than the driveshaft, which has IRS so the driveshaft in theory doesn't move much.

Andrew
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post #41 of 41 (permalink) Old 06-29-2016, 09:11 AM Thread Starter
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Originally Posted by alfaparticle View Post
That is no doubt the reason for the removable cross member under the front section. One ABB member came close to having his leg amputated when the Giubo let go.
Sorry, meant to say "front of the rear shaft dropping down".

Quote:
Originally Posted by Andrew View Post
Summit Racing, Jegs, etc all have generic driveshaft safety hoops for drag and other race cars. I'm sure something could be adapted or fabbed up. I just today saw a tiny little hoop on a TZ, barely bigger than the driveshaft, which has IRS so the driveshaft in theory doesn't move much.

Andrew

I'm aware of safety hoops, tunnel blankets etc. for racing and they all look kind of bulky, heavy duty pieces. Was thinking of something that looks like a stock item for a street car. Whole center support bracket with some reinforcement might work.
What do you mean by IRS?

Zaza

Current Alfas:

2018 Stelvio Ti Sport
1987 Milano Verde
1970 Euro-spec GTV 1750

Refreshing 1750 GTV
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