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> Identifying 19mm and 17mm master cylinders
jamara
post Dec 6 2006, 05:57 PM
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I just bought what was advertised as a 19mm master cylinder off EBay. I got it last night in the mail and I believe it is a 17mm. Thing is, there is a 17 stamped (cast) onto the neck and a smaller 19 cast onto the underside of the body. So, which is it? I need to contact the seller and let them know they sent me the wrong one. But first I want to make sure I know what I am talking about.

Also, out of curiosity, is possible to convert a 17mm to 19mm by having a machine shop bore out the inside 2mm. I know a 19mm piston would need to be procured. Just wondering.

Thanks!
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davep
post Dec 7 2006, 08:58 AM
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QUOTE(jamara @ Dec 6 2006, 03:57 PM) *

Also, out of curiosity, is possible to convert a 17mm to 19mm by having a machine shop bore out the inside 2mm.

The MC's may be marked in mm, but they are most definitely an inch part. You would want to bore it out 1/16". On the other hand, I don't know if the bore is exactly the inch size, the piston is the inch size, or the average is the inch size.

The size marking is on the neck that fits inside the pedal cluster. All other marks are just casting info, and must be ignored. You definitely got a 17mm part.
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Posts in this topic
jamara   Identifying 19mm and 17mm master cylinders   Dec 6 2006, 05:57 PM
Travis Neff   That would be a 17mm master Cyl. I have never he...   Dec 6 2006, 06:00 PM
davep   check out this thread http://www.914world.com/bbs...   Dec 6 2006, 06:33 PM
Borderline   I could use a 17mm MC! Is it gud? How much d...   Dec 6 2006, 10:01 PM
jamara   Thanks for all the feedback. I am quite certain th...   Dec 7 2006, 12:13 PM
michel richard   Usually, if it says "17" on the master c...   Dec 7 2006, 06:34 AM
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