 What Master Cylinder is this?, G3? |
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| Steve |
 Oct 1 2022, 03:11 PM
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#1
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914 Guru  Group: Members Posts: 5,614 Joined: 14-June 03 From: Orange County, CA Member No.: 822 Region Association: Southern California 
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 Is this a 17mm or 19mm master cylinder? Thanks for the help!! |
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| Superhawk996 |
Oct 1 2022, 03:22 PM
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#2
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914 Guru Group: Members Posts: 5,904 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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I’m not sure you can tell by that code which is probably a casting number. Someone will correct me if I’m wrong.
The bore diameter 17 or 19 is on the casting but unfortunately that part of the casting is on the other side of the sheet metal, inside the pedal box area and you can’t see it without removing the master cylinder. Even then if the casting is really rusty they can be hard to read. I recently had on that was super crusty and hard to read. Wasn’t until I disassembled and measured that I knew for sure. |
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| brant |
Oct 2 2022, 09:53 AM
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#3
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914 Wizard Group: Members Posts: 11,640 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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Pretty sure all of the sixes came originally with 19mm
So educated guess is that it would be unlikely to have been downsized by a previous owner |
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| Superhawk996 |
Oct 2 2022, 10:46 AM
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#4
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914 Guru Group: Members Posts: 5,904 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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FWIW I have a 19mm ATE taken apart right now and it has “13” in that same location - furthers my suspicion it is a mold number
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| bbrock |
Oct 2 2022, 11:28 AM
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#5
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains
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QUOTE(Superhawk996 @ Oct 2 2022, 10:46 AM)  FWIW I have a 19mm ATE taken apart right now and it has “13” in that same location - furthers my suspicion it is a mold number And I have a 17mm on my bench right now that has "22" in that location. No idea what that means. |
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| 914Sixer |
Oct 2 2022, 12:45 PM
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#6
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914 Guru Group: Members Posts: 8,906 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region
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Can you get a flex angle mirror to look at the top? That you you might be able to see size.
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| Steve |
Oct 2 2022, 01:39 PM
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#7
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914 Guru Group: Members Posts: 5,614 Joined: 14-June 03 From: Orange County, CA Member No.: 822 Region Association: Southern California
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QUOTE(brant @ Oct 2 2022, 08:53 AM) Pretty sure all of the sixes came originally with 19mm So educated guess is that it would be unlikely to have been downsized by a previous owner Both of my cars are 4 banger conversions. |
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