Exedy Clutch Master Cylinder (MC205) Mounting Stud Mismatch
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Junior Member
Joined: Jul 2023
Posts: 13
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From: OH, USA
Exedy Clutch Master Cylinder (MC205) Mounting Stud Mismatch
Hello,
I recently changed both the master and slave cylinders on my 1980 RX-7. I purchased an Exedy clutch master cylinder (part number MC205) from RockAuto, and I wanted to make everyone on here aware that the unthreaded length in the middle of the double-ended studs that came with the cylinder is too long to properly bolt the cylinder to the firewall. I made a silly mistake, and installed the cylinder without checking the length of the new studs against the length of the old studs!
It was an easy mistake to fix, though; dismount the master cylinder and use two nuts torqued against each other to back the studs out of the new and old master cylinders, then thread the old studs (which are the proper length) onto the new master cylinder.
Otherwise, the Exedy is a great replacement for an OEM cylinder. My clutch feels way more communicative than it did before. I don't want to knock Exedy's product, just give you all a heads up about the different stud lengths and hopefully save somebody some time!
I recently changed both the master and slave cylinders on my 1980 RX-7. I purchased an Exedy clutch master cylinder (part number MC205) from RockAuto, and I wanted to make everyone on here aware that the unthreaded length in the middle of the double-ended studs that came with the cylinder is too long to properly bolt the cylinder to the firewall. I made a silly mistake, and installed the cylinder without checking the length of the new studs against the length of the old studs!
It was an easy mistake to fix, though; dismount the master cylinder and use two nuts torqued against each other to back the studs out of the new and old master cylinders, then thread the old studs (which are the proper length) onto the new master cylinder.
Otherwise, the Exedy is a great replacement for an OEM cylinder. My clutch feels way more communicative than it did before. I don't want to knock Exedy's product, just give you all a heads up about the different stud lengths and hopefully save somebody some time!
84SE-EGI helpy-helperton
Joined: Oct 2002
Posts: 3,573
Likes: 536
From: Phoenix, AZ
Welcome to the club - we've all done that! With as difficult as it is to get under there close enough to reach, get those 12mm bolts in place without dropping them down the firewall, and then make 1/16 rotations on a box end for what seems like hours to get them tight, only to find that they're bottomed out and the assembly flops back and forth...
Yeah, you're learning that lesson once and forever!
Yeah, you're learning that lesson once and forever!
Old [Sch|F]ool
Joined: May 2001
Posts: 12,848
Likes: 563
From: Cleveland, Ohio, USA
It's not just exedy, every clutch master I've put in in the last 20 years or so has the wrong studs.
Also, you need to work on an S1. It's about five minutes to swap the master, you can easily get to the nuts with a socket and extension.
Also, you need to work on an S1. It's about five minutes to swap the master, you can easily get to the nuts with a socket and extension.
TopGunM2k
Joined: Sep 2004
Posts: 302
Likes: 27
From: San Jose, CA
Thanks for the heads up - I actually just received that exact same part from Rock Auto two days ago. It was hard to pass on at $24 and seeing that the current part on the car seems to be leaking a bit. I will install it eventually but will definitely do as you forewarned to ensure it's done right.
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