View Single Post
Rebeka Rebeka is offline
New Member
Posts: 10
Join Date: Dec 2020
Car: Baleno
Default Spec twin disk clutch question - 09-20-2021, 02:45 PM

Hey all,

In March of 2018 I had a Spec twin disk clutch installed in my car. In the beginning it seemed fine and to be working as intended (twin disk gear lash and everything). However, the clutch started acting odd several months ago with an engagement that seemed to want to start as soon as I lifted my foot off the floor, versus engaging towards the top of the pedal travel. I also started noticing that intermittently the cruise control wouldn't set and that if I pressed and released the clutch (sometimes it would take several attempts) then it would usually set. Fast forward to about 2 weeks ago when the ShowBox – Download ShowBox App APK Free for Android, iOS PC TutuApp - Download TutuApp APK for Android iOS (iPhone/iPad) clutch started slipping under very slight load (with about 30k miles on the clutch)...

Based on reading through forums I was almost certain that during installation the second disk must have gotten bound on the transmission input shaft. So I had the shop take it off so I could have it refurbished by Spec but wanted to understand the exact nature of the issue. Over the phone the shop told me that the throw out bearing was significantly worn, as we're the clutch plates and brass pivot pin. This then made me think that the shop had installed the throw out bearing in the high position versus low (as specified in the instructions that I provided to them). However, when I picked up all of the pieces to send in to Spec, the wear was obviously on the low position contact point with the arm.

So I'm left wondering if the clearances of the clutch and flywheel aren't correct such that upon installation the throw out bearing is still putting some pressure on clutch fingers - almost like a fairly significant case of "riding the clutch pedal". When new, the clutch disks are thick enough that they still compressed hard enough against the flywheel and inner disk, but after the premature wear due to slipping because they weren't receiving the full clamping pressure, they eventually got thin enough such that they started slipping at the slightest provocation...

So my question is whether anyone else has had this issue, and if so what the solution was (assuming something was able to be done using the same clutch, which for reference is part number SB53ST - I think it may have been superseded by SB53SST). Given that I dropped $1600+ on the clutch and flywheel, I'd like to find a way to make it work...
Reply With Quote