That mystery grinding noise typically after a clutch job - Page 3 - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


General Miata Chat A place to talk about anything Miata

Reply
 
 
 
LinkBack Thread Tools
Old 10-21-2008, 11:27 PM   #41
Cpt. Slow
iTrader: (25)
 
curly's Avatar
 
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 12,105
Total Cats: 518
Default

did everyone have their flywheel resurfaced while changing the clutch?
curly is offline   Reply With Quote
Old 10-21-2008, 11:29 PM   #42
Elite Member
Thread Starter
iTrader: (10)
 
rccote's Avatar
 
Join Date: Jan 2008
Location: Buffalo NY
Posts: 1,595
Total Cats: 17
Default

Quote:
Originally Posted by curly View Post
did everyone have their flywheel resurfaced while changing the clutch?
My transmission place resurfaced mine.
rccote is offline   Reply With Quote
Old 10-21-2008, 11:38 PM   #43
Elite Member
iTrader: (8)
 
Join Date: Aug 2007
Location: Bellingham, Wa
Posts: 2,732
Total Cats: 3
Default

I really want to see a video of your noise to make sure its the same as mine.

What i know about mine:
Its the same deceleration from 4-3k rpm that you guys seem to indicate.
It started after my first clutch change. I took it to a shop, didn't perform the change myself. It was very obvious after the clutch change.
Since then:
I've rebuilt the engine
Swapped transmissions (M1 full syn in the tranny atm).
Upgraded to 1.8 Clutch/oem flywheel
Re-aligned my PPF (solved the issue for maybe one day, its back in just about full force again)
I suppose I could try rotating my driveshaft. It is possible that the shop put it on wrong and i just put it back on wrong after my swap (i marked it like you're suppose to, doesn't mean they did though). It seems fairly likely that this could be the problem.

My mechanic friend/fellow miata owner swears its just the sound of gears meshing together at certain RPMs, i dont buy it.

I'm starting to think u-joints. Have any of you swapped driveshafts yet? I might have missed this being mentioned when reading.
wayne_curr is offline   Reply With Quote
Old 10-21-2008, 11:48 PM   #44
Elite Member
Thread Starter
iTrader: (10)
 
rccote's Avatar
 
Join Date: Jan 2008
Location: Buffalo NY
Posts: 1,595
Total Cats: 17
Default

Quote:
Originally Posted by wayne_curr View Post
I'm starting to think u-joints. Have any of you swapped driveshafts yet? I might have missed this being mentioned when reading.
I think it's safe to say u joints are out for us, sound can be produced in neutral. Plus I changed my driveshaft to the 1.8 one. You should try and see if you can make the sound in neutral to verify you're in the same boat as us. Rev up to like 3k in neutral and let off the gas quickly. Let us know.
rccote is offline   Reply With Quote
Old 10-21-2008, 11:56 PM   #45
Elite Member
iTrader: (8)
 
Join Date: Aug 2007
Location: Bellingham, Wa
Posts: 2,732
Total Cats: 3
Default

Quote:
Originally Posted by rccote View Post
I think it's safe to say u joints are out for us, sound can be produced in neutral. Plus I changed my driveshaft to the 1.8 one. You should try and see if you can make the sound in neutral to verify you're in the same boat as us. Rev up to like 3k in neutral and let off the gas quickly. Let us know.
Let me go try again. Is it just as loud for you guys in neutral?
wayne_curr is offline   Reply With Quote
Old 10-22-2008, 12:06 AM   #46
Elite Member
Thread Starter
iTrader: (10)
 
rccote's Avatar
 
Join Date: Jan 2008
Location: Buffalo NY
Posts: 1,595
Total Cats: 17
Default

Quote:
Originally Posted by wayne_curr View Post
Let me go try again. Is it just as loud for you guys in neutral?
It's more of a subtle less constant sound but it's clearly there.
rccote is offline   Reply With Quote
Old 10-22-2008, 12:09 AM   #47
Cpt. Slow
iTrader: (25)
 
curly's Avatar
 
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 12,105
Total Cats: 518
Default

there is a bolt that bolts the tranny gasket (the thick metal plate) to the engine block, I left mine out after an engine rebuild (not on purpose) and it would vibrate against the block at certain rpm. any chance either of you left that bolt out? its around where the red circle, behind the flywheel obviously.

Name:  trannygasketbolt.jpg
Views: 66
Size:  63.5 KB
curly is offline   Reply With Quote
Old 10-22-2008, 12:17 AM   #48
Elite Member
iTrader: (8)
 
Join Date: Aug 2007
Location: Bellingham, Wa
Posts: 2,732
Total Cats: 3
Default

I for sure put that back in...

I tried in neutral, i dont really hear it. Maybe slightly.
wayne_curr is offline   Reply With Quote
Old 10-22-2008, 12:33 AM   #49
Elite Member
Thread Starter
iTrader: (10)
 
rccote's Avatar
 
Join Date: Jan 2008
Location: Buffalo NY
Posts: 1,595
Total Cats: 17
Default

Quote:
Originally Posted by curly View Post
there is a bolt that bolts the tranny gasket (the thick metal plate) to the engine block, I left mine out after an engine rebuild (not on purpose) and it would vibrate against the block at certain rpm. any chance either of you left that bolt out? its around where the red circle, behind the flywheel obviously.

Any chance you can see that bolt looking down from under the hood?
rccote is offline   Reply With Quote
Old 10-22-2008, 03:14 AM   #50
Junior Member
 
Join Date: Sep 2008
Location: Head Wound City, CT
Posts: 215
Total Cats: 0
Default

Not without the trans off. It's a 10mm bolt IIRC, just holds the gasket in place while you put the transmission back on the motor.
MattEGTR is offline   Reply With Quote
Old 10-22-2008, 04:00 AM   #51
Senior Member
iTrader: (7)
 
nicacus's Avatar
 
Join Date: Jul 2006
Location: SLC UT
Posts: 1,133
Total Cats: 0
Default

Mine is also still audible with the clutch in.
The videos are uploading right now. you can't hear it very well, and I hope youtubes compression doesnt fuxor it up even more...

Last edited by nicacus; 10-22-2008 at 01:03 PM.
nicacus is offline   Reply With Quote
Old 10-22-2008, 04:16 AM   #52
Senior Member
iTrader: (7)
 
nicacus's Avatar
 
Join Date: Jul 2006
Location: SLC UT
Posts: 1,133
Total Cats: 0
Default

Here is the one while driving, you can start to hear it around 13 seconds and really hear it around 24..





Just made this video this is in nuetral with the clutch pedal to the floor:
It's the sounds that makes me punch infants




I'm about 99.99999% percent sure I put that bolt in.. I have a pic somewhere maybe I will be able to check and see..
nicacus is offline   Reply With Quote
Old 10-22-2008, 04:21 AM   #53
Senior Member
iTrader: (7)
 
nicacus's Avatar
 
Join Date: Jul 2006
Location: SLC UT
Posts: 1,133
Total Cats: 0
Default

Quote:
Originally Posted by curly View Post
there is a bolt that bolts the tranny gasket (the thick metal plate) to the engine block, I left mine out after an engine rebuild (not on purpose) and it would vibrate against the block at certain rpm. any chance either of you left that bolt out? its around where the red circle, behind the flywheel obviously.

You can see one of the bolts in place in this pic so i am 100% sure I put them all in
Name:  IMG_7275.jpg
Views: 65
Size:  160.3 KB
nicacus is offline   Reply With Quote
Old 10-22-2008, 04:33 AM   #54
Elite Member
iTrader: (6)
 
Join Date: Sep 2007
Location: CA
Posts: 1,990
Total Cats: 9
Default

You're sure it's not the heatshield rattling around?

In my Integra, I get a similar rattle. Something in the exhaust manifold B pipe was known to go bad. Replaced w/ headers and sound went away.

Obviously you're turbo, but maybe something along the same lines? Something loosey goosey?

Ever have anyone listen around the car for it? Screw driver to ear could maybe help isolate it?
kenzo42 is offline   Reply With Quote
Old 10-22-2008, 04:44 AM   #55
Senior Member
iTrader: (7)
 
nicacus's Avatar
 
Join Date: Jul 2006
Location: SLC UT
Posts: 1,133
Total Cats: 0
Default

The sound is still there with the turbo heat shield off, even the cat heat shield isn't on because I thought it might have been the cause. I have tried listening with a screw driver and cant hear any single spot it is coming from. It's so loud that it resonates throughout the entire engine bay, but it seems to be the loudest behind the engine were the block and tranny come together, on the passenger side.
nicacus is offline   Reply With Quote
Old 10-22-2008, 12:13 PM   #56
Junior Member
 
Join Date: Mar 2008
Location: GJ, CO
Posts: 224
Total Cats: 0
Default

I've got this same exact sound coming from my car as well. Grinding/rattling noise under deceleration. Thought maybe the transmission was on it's way out, but it shifts fine and runs great, so can't be that. This started after I changed the engine in the car earlier this year. Really interested to see if someone on here comes up with a solution.

nicacus: Those videos confirm that the noise I am hearing is exactly what you are experiencing. So we're in the same boat.
GT3man2001 is offline   Reply With Quote
Old 10-22-2008, 01:06 PM   #57
Senior Member
iTrader: (7)
 
nicacus's Avatar
 
Join Date: Jul 2006
Location: SLC UT
Posts: 1,133
Total Cats: 0
Default

Well this sucks, It's the sasquatch of noises.
nicacus is offline   Reply With Quote
Old 10-22-2008, 04:00 PM   #58
Senior Member
iTrader: (7)
 
nicacus's Avatar
 
Join Date: Jul 2006
Location: SLC UT
Posts: 1,133
Total Cats: 0
Default

I got the car up on stands and tied the throttle to hold it at 4000RPM.
While I was under the car it seemed like the buzzing sound was coming from the cat, I'm going to see if I can hear the noise with the cat removed once the car cools down.

I'll have a test pipe here on friday, hopefully that will fix it if the cat is the culprit
nicacus is offline   Reply With Quote
Old 10-22-2008, 04:29 PM   #59
Elite Member
iTrader: (28)
 
Join Date: May 2008
Location: St. Augustine FL
Posts: 2,310
Total Cats: 2
Default

I have a noise on de-acceleration, doesn't like either of the videos I wonder....... also I haven't checked the positioning of the PPF yet but, however before I replaced the clutch I had it the flywheel resurfaced would that effect anything?
p51hellfire is offline   Reply With Quote
Old 10-22-2008, 05:35 PM   #60
Senior Member
iTrader: (7)
 
nicacus's Avatar
 
Join Date: Jul 2006
Location: SLC UT
Posts: 1,133
Total Cats: 0
Default

Quote:
Originally Posted by p51hellfire View Post
I have a noise on de-acceleration, doesn't like either of the videos I wonder....... also I haven't checked the positioning of the PPF yet but, however before I replaced the clutch I had it the flywheel resurfaced would that effect anything?

Resurface = good
nicacus is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 57 07-19-2017 05:11 PM
1994 Spec Miata Race Car SM/SM2/SSM For Sale Quinn Cars for sale/trade 6 10-23-2016 08:58 AM
ACT race clutch and AASCO 7lb. aluminum flywheel graexodus Miata parts for sale/trade 5 10-26-2015 02:48 PM
Moroso Air Oil Separator Catch Can Aroundcorner Miata parts for sale/trade 2 10-01-2015 04:20 PM
Another Alternator thread ihiryu General Miata Chat 9 09-28-2015 11:22 AM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 07:02 PM.