Author Topic: 2227161 Master Cylinder Variations  (Read 548 times)

Offline 67gtasanjose

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2227161 Master Cylinder Variations
« on: April 22, 2017, 07:46:20 AM »
Having read through many articles and threads, I am still a little confused if there are any previous posts within this forum to ID the variations of this 67-70 master cylinders.

Please guide me if there are (move topic also if need be)

So, we should find these cylinders to have a stop bolt on the bottom, a bendix logo, a Julian date code, the casting number 2227161 in the bottom, the "bump" on the front side of the rear brake outlet port, different caps depending on the year and production month and I am sure other details I failed to mention.

QUESTIONS:
1.) What years used the hex bolt and when (time period approximately) did these hex bolts change over to the Allen bolt?
2.) Does anyone have pictures of original Hex & Allen Bolts?
3.) Where the fittings come out of the housing, are these originally machined surfaces or are some simply "cast" (porous) ?
4.) Bail wire, though painted as an assembly while mounted to the booster, what finish should be on the wire before it is painted?
5.) Numbers stamped into the sides of the cylinders, is there a "code" known on what they are?

Maybe more questions related to this topic will come out, but I felt like I needed to be "schooled" on spotting the "CORRECT" cylinders at a glance. (And likewise an incorrect one "at a glance")

Attached below are a couple pictures of the fitting side & bottom side of a NOS unit, but who knows how "correct" it really is  ::)
« Last Edit: April 22, 2017, 07:57:18 AM by 67gtasanjose »
Richard Urch

1967 (11/2/66, S.J.) Luxury Coupe, 289-4V w/Thermactor Emissions, C-4, Well Optioned
2005 (04/05) GT Premium Convertible, Windveil Blue, Parchment Top w/Med. Parchment interior,  Roush Body Appointments

Offline Bob Gaines

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Re: 2227161 Master Cylinder Variations
« Reply #1 on: April 22, 2017, 12:42:43 PM »
Having read through many articles and threads, I am still a little confused if there are any previous posts within this forum to ID the variations of this 67-70 master cylinders.

Please guide me if there are (move topic also if need be)

So, we should find these cylinders to have a stop bolt on the bottom, a bendix logo, a Julian date code, the casting number 2227161 in the bottom, the "bump" on the front side of the rear brake outlet port, different caps depending on the year and production month and I am sure other details I failed to mention.

QUESTIONS:
1.) What years used the hex bolt and when (time period approximately) did these hex bolts change over to the Allen bolt?
2.) Does anyone have pictures of original Hex & Allen Bolts?
3.) Where the fittings come out of the housing, are these originally machined surfaces or are some simply "cast" (porous) ?
4.) Bail wire, though painted as an assembly while mounted to the booster, what finish should be on the wire before it is painted?
5.) Numbers stamped into the sides of the cylinders, is there a "code" known on what they are?

Maybe more questions related to this topic will come out, but I felt like I needed to be "schooled" on spotting the "CORRECT" cylinders at a glance. (And likewise an incorrect one "at a glance")

Attached below are a couple pictures of the fitting side & bottom side of a NOS unit, but who knows how "correct" it really is  ::)
The hex bolt was used from 67-possibly to early 68 and the cone shaped allen stop bolt one after that is my current understanding from observations. The fitting surfaces are machined from what I have seen. They had rubber plugs installed in the fitting opening before painting each of a different size. The plugs were not the same size as the flat machined surface so after painting the removed plug would leave a black witness line one of about the size of a dime and the other a nickel . The bail wire was added after painting evidence indicates to me.
Bob Gaines,Shelby enthusiast, Shelby collector , Shelby concours judge SAAC,MCA,Mid America Shelby

Offline 67gtasanjose

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Re: 2227161 Master Cylinder Variations
« Reply #2 on: April 22, 2017, 01:32:59 PM »
Thanks for that information Bob.
Looking through another thread, I found this image of "variations" (Marcus posted it)

I would think there may be a general understood trend of "known original examples" where some of these subtle differences may possibly be better understood.
Richard Urch

1967 (11/2/66, S.J.) Luxury Coupe, 289-4V w/Thermactor Emissions, C-4, Well Optioned
2005 (04/05) GT Premium Convertible, Windveil Blue, Parchment Top w/Med. Parchment interior,  Roush Body Appointments

Offline J_Speegle

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Re: 2227161 Master Cylinder Variations
« Reply #3 on: April 22, 2017, 07:29:44 PM »
............The bail wire was added after painting evidence indicates to me.

As a note - Bob and I are discussing this point since it's different from prior statements and our different experiences and recall.

Will post just this one link to Jacks site with a reported 7k mile original master cylinder. Not much black remains on the main body but the cap and retaining wire still retain a fair amount of paint

http://www.deadnutson.com/page/page/2634063.htm




Richard will take a look to see what points I can help with. The bottom side of original master cylinders (especially while still in the car) isn't an easy and often taken picture :)
Jeff Speegle

Anything worth doing is worth doing concours ;)

Offline Bob Gaines

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Re: 2227161 Master Cylinder Variations
« Reply #4 on: April 22, 2017, 09:19:28 PM »
As a note - Bob and I are discussing this point since it's different from prior statements and our different experiences and recall.

Will post just this one link to Jacks site with a reported 7k mile original master cylinder. Not much black remains on the main body but the cap and retaining wire still retain a fair amount of paint

http://www.deadnutson.com/page/page/2634063.htm


I am still in agreement on the Bendix Booster/Master assembly. I am skeptical about the Midland Booster/Bendx Master assembly being exactly the same all of the time. I am continuing research and discussion with Jeff S on the subject. 
Bob Gaines,Shelby enthusiast, Shelby collector , Shelby concours judge SAAC,MCA,Mid America Shelby

Offline 67gta289

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Re: 2227161 Master Cylinder Variations
« Reply #5 on: June 10, 2017, 11:02:53 AM »
This one quieted down a bit.  I was doing some clean up and documentation on four master cylinders I have, and aside from the 2227161 marking on the bottom, I did in each case find markings on the driver's (hydraulic port) side.

Hopefully this helps.

I did not look for the "dimple" noted in Jack's web site, will do that later and report back.
John
67 289 GTA Dec 20 1966 San Jose
MCA 74660