Should I get this flywheel and pressure plate resurfaced? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 12-13-2009, 11:49 PM   #1
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Default Should I get this flywheel and pressure plate resurfaced?

Is this spotting normal? My bellhousing was VERY dirty and I'm guessing these spots were from burned off oil. The clutch was holding fine before I took it off. This is a FM flywheel and an ACT extreme pp and extreme organic disc (with 30K of wear).

Should I get this resurfaced?





Here's the pressure plate.




The disc looked just fine. Looks like very little wear for 30k miles and piles of launches.




Last edited by Faeflora; 12-14-2009 at 11:07 AM.
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Old 12-13-2009, 11:54 PM   #2
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I would. But thats just me.
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Old 12-13-2009, 11:54 PM   #3
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I suggest cleaning the flywheel with a scotchbrite and brake clean or something similar to get whatever is discoloring it off. Otherwise that is a ton of really awkward abnormal hotspots and I would resurface it for sure.
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Old 12-14-2009, 12:25 AM   #4
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Scotchbrite them bitches. Those don't look like seriously bad hot spots, if they were they would be black/blue/purple like a rainbow. Disk looks good too.
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Old 12-14-2009, 01:03 AM   #5
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Quote:
Originally Posted by sbkcocker499 View Post
I would. But thats just me.
Same here.
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Old 12-14-2009, 07:10 AM   #6
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What brand disk?
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Old 12-14-2009, 09:38 AM   #7
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Looks like the ACT disc that comes with the HD or XT street disc package.

I'd see if FM has a replacement friction surface for the flywheel and simply scotch-brite the PP>
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Old 12-14-2009, 09:41 AM   #8
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yeah you cant resurface that flywheel, and i've yet to find a machinist that will resurface a pressure plate. so its either new friction surface and new pressure plate, or do your best to clean it up yourself.
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Old 12-14-2009, 03:43 PM   #9
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yes you should resurface it.
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Old 12-14-2009, 03:49 PM   #10
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get a new friction plate.

A flyin miata flywheel = fidanzda IIRC
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Old 12-14-2009, 04:46 PM   #11
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Resurface the flywheel, or use emory cloth on both of them.

I made the mistake of not doing one of those on my DSM and it suffered from horrible clutch shudder.
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Old 12-14-2009, 05:03 PM   #12
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Quote:
Originally Posted by therieldeal View Post
yeah you cant resurface that flywheel, and i've yet to find a machinist that will resurface a pressure plate. so its either new friction surface and new pressure plate, or do your best to clean it up yourself.
A real clutch shop will do it no problem, whereas a basic machine shop might not have the equipment to easily work around the mounting lugs. But a really good machine shop could/should do it. Tampa Clutch on 40th Street will do it.

I would resurface it. Some of that kind of marking is normal, but that much is abnormal.

If you decide not to resurface it, at the very least scuff it by hand with some fine grit paper in small circular motions. But I say resurface.

Edit:Remembered it was an aluminum flywheel. If you remove the friction face from the flywheel, the machine shop can put it on their giant belt sander for a second and freshen/true it right up easy. PP also.
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Old 12-14-2009, 05:12 PM   #13
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Miata's are really sensitive to clutch stack height. I think that if you resurface the flywheel and pp and reuse that disc, you're going to either have a pedal that engages WAY at the top or not at all.
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Old 12-14-2009, 05:36 PM   #14
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Quote:
Originally Posted by vehicular View Post
Miata's are really sensitive to clutch stack height. I think that if you resurface the flywheel and pp and reuse that disc, you're going to either have a pedal that engages WAY at the top or not at all.
Aren't we talking thousandths or hundredths of an inch for resurfacing?
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Old 12-14-2009, 05:42 PM   #15
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.015 on both the fw and pp, and .050 total wear on the disc is 1/3 the total thickness of the disc... That doesn't include the 30k miles of wear on the fw and pp.
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Old 12-15-2009, 12:55 PM   #16
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Resurface!!! I made the mistake of not doing it, just cleaning and scotchbrite, when I put in a new clutch and my car jerked all thye time. had to put in another clutch.
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Old 12-15-2009, 01:29 PM   #17
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OK I found out that the old FM flywheel can have a replacement surface installed. I'm going to take it to a shop today to see if they can resurface it first though.
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Old 12-15-2009, 01:46 PM   #18
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i told you this already!
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Old 12-15-2009, 03:07 PM   #19
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Riiiiight . Ty :>.

Fyi for anyone else who needs a new surface for their old purple fm flywheel, you can get one from fidanza but you need to count up the number of plate bolts firt.
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Old 12-15-2009, 04:00 PM   #20
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Quote:
Originally Posted by vehicular View Post
Miata's are really sensitive to clutch stack height. I think that if you resurface the flywheel and pp and reuse that disc, you're going to either have a pedal that engages WAY at the top or not at all.
I was going to say something similar. Resurface IF you use a new disk. otherwise leave it as is. That's how it wore, that's how it wants to be with that surface to disc contact.

I bet everyone who had problems when the didn't resurface also put in a new disc.

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