Stargazer HalfDork
April 28, 2009 5:56 p.m.

My miata just recently starting making this noise. It's present at idle and sounds like a general grumbling sound and goes away when I push the clutch in. In 1st or 2nd gear at about 2k rpm, it's much louder and sounds like a stick in fan blades. Since it comes and goes with the clutch, I think it's somehow transmission related. Quick history on the car: '95 w/ approx. 235k on chassis, 170k on trans., 200k on torsen diff, 35k on speed longblock. It shifts fine, and everything feels fine aside from the noise. Ideas? Thanks!

GregTivo Reader
April 28, 2009 5:59 p.m.

your throwout bearing's shot, you need to either replace the clutch or endure the noise until the clutch stops functioning and then replace the clutch.

Stargazer HalfDork
April 28, 2009 6:01 p.m.

Forgot to mention - it's an ACT stage 1 clutch with 35k miles. Is it normal to die this soon?

GregTivo Reader
April 28, 2009 6:02 p.m.

depends on if the throwout bearing was replaced with the last clutch. You could pull the transmission and replace the throwout bearing without touching the clutch itself, but you're still pulling the transmission. shrug

Tyler H Dork
April 28, 2009 6:23 p.m.

The throwout bearings with aftermarket clutch kits are generally crap. I usually buy a new OEM bearing for a clutch job.

Stargazer HalfDork
April 28, 2009 6:49 p.m.

How many hours to do a clutch job for a) DIYer with decent wrench skills and regular tools, b) mechanic ?

Stargazer HalfDork
April 29, 2009 8:39 a.m.

Wouldn't a bad TO bearing make noise when the clutch is disengaged (pedal pressed)?

GregTivo Reader
April 29, 2009 10:42 a.m.
Stargazer wrote: Wouldn't a bad TO bearing make noise when the clutch is disengaged (pedal pressed)?

No, the throwout bearing is loaded by the transmission while the clutch is engaged and when the clutch is disengaged, the transmission load is gone. The pilot bearing on the flywheel is the opposite. While the clutch is pressed again the flywheel, the load on the pilot bearing is the least whereas when the clutch is disengaged from the flywheel, the pilot bearings load is greatest because now the weight is no longer supported by the transmission shaft.

GregTivo Reader
April 29, 2009 10:53 a.m.
Stargazer wrote: How many hours to do a clutch job for a) DIYer with decent wrench skills and regular tools, b) mechanic ?

The hardest part is the removal and reinstallation of the transmission and bellhousing. The PPF needs to be either removed or shifted out of the way and a section of the exhuast needs to be removed also. The actual removal and replacement of the clutch is fairly simple. A press is recommended to remove and reinstall the pilot bearing, but can be done with appropriate hand tools (such as a hub puller) An experienced mechanic may take 4 hours to do the job. A novice with the right tools (pnuematic operated and socket extensions) working in a typical garage, probably about 12.

Its not the easiest job, but it is very doable by a DIYer.

You'll need to log in to post.

Also on Grassroots Motorsports

Spend Your Evening on Track for Just $50

16 hours ago in News

April is "Member’s Month" at SCCA's Track Night in America.

2017 Audi A4 2.0T Quattro

18 hours ago in New Car Reviews

The Audi A4, BMW's 3-Series competitor appeals more to the luxury market than the performance market. However, don't discount the ...

Join Our Porsche Experience Tour

22 hours ago in News

It's a back-roads adventure to the Classic Motorsports Mitty

Sharing is Caring

1 day ago in Articles

If something puts a smile on your face or makes you a better person, share it.

Wendi Allen Scholarship Recipients Named

1 day ago in News

Haley Oosterhof and Elayne Man have proved to be outstanding SCCA members.

Focus on Rallycross With Us

2 days ago in News

We're headed to the Firm this Saturday for some rallycross fun.

Get Our Magazine in Print and Digital for just $16.99

3 days ago in News

Now is a great time to renew or start subscribing to our magazine.

KMiata

3 days ago in Articles

Does Honda power create the perfect Miata?

Project Mustang: An Effort to Standalone

3 days ago in Project Cars

We put an AEM engine management system in our Mustang.

Meet Hurley Haywood at the Mitty

4 days ago in News

Porsche will be the featured marque at the Mitty, and we have a Porsche legend for you to meet at ...

2017 Subaru BRZ

4 days ago in New Car Reviews

The internet has doled out a lot of mixed opinions on the BRZ and its twin, now called the Toyota ...

Reader's Ride of the Week: Autocross Ranger

4 days ago in News

This is no ordinary Ranger.

OUR SPONSORS

Grassroots Motorsports Magazine

Subscribe Today

Also get your instant access to the digital edition of Grassroots Motorsports Magazine!

Learn More
PqGVQSQcg2RpLnIZwvhhL12GByOU7LWH