Transmission noise, any suggestions?
#1
Transmission noise, any suggestions?
I replaced the clutch in my 1993 a few years ago (I typically put less than 2k miles on the car a year) and immediately after I noticed a slight amount of noise at idle that goes away when the pedal is fully depressed (Exedy OE HD clutch kit). I was told it was normal clutch chatter and I left it at that. However, after flogging on the car pretty hard for three days at Tail of the Dragon in October, the sound is now MUCH louder. It sounds like a mechanical clacking noise that still goes away when the clutch is fully depressed. It also gets louder with RPM. The car still drives and shifts fine. The only change is the noise. I drained the trans fluid and it has a good deal of glitter in it, so I pulled the trans thinking my input shaft bearing had failed. I got a low mileage used 95 trans that I am getting ready to put back in the car, but it seems to have even more input shaft play than my 93 trans.
In summary, is there a way to check the input shaft bearing condition without disassembling the trans? Is there something else that I should be looking for that could be making the clacking sound if my trans isn't the culprit? I already plan on checking the flywheel nut torque once I remove the clutch (I machined the flywheel last time it was apart). Any help is much appreciated.
In summary, is there a way to check the input shaft bearing condition without disassembling the trans? Is there something else that I should be looking for that could be making the clacking sound if my trans isn't the culprit? I already plan on checking the flywheel nut torque once I remove the clutch (I machined the flywheel last time it was apart). Any help is much appreciated.
The following users liked this post:
gracer7-rx7 (11-30-23)
#6
Hey Jason...this "may" make you feel better about end play:
https://www.rx7club.com/3rd-generati...-play-1149871/
Jim T
https://www.rx7club.com/3rd-generati...-play-1149871/
Jim T
Last edited by redheddude222; 11-30-23 at 03:18 PM.
#7
Racecar - Formula 2000
I replaced the clutch in my 1993 a few years ago (I typically put less than 2k miles on the car a year) and immediately after I noticed a slight amount of noise at idle that goes away when the pedal is fully depressed (Exedy OE HD clutch kit). I was told it was normal clutch chatter and I left it at that. However, after flogging on the car pretty hard for three days at Tail of the Dragon in October, the sound is now MUCH louder. It sounds like a mechanical clacking noise that still goes away when the clutch is fully depressed. It also gets louder with RPM. The car still drives and shifts fine. The only change is the noise. I drained the trans fluid and it has a good deal of glitter in it, so I pulled the trans thinking my input shaft bearing had failed. I got a low mileage used 95 trans that I am getting ready to put back in the car, but it seems to have even more input shaft play than my 93 trans.
In summary, is there a way to check the input shaft bearing condition without disassembling the trans? Is there something else that I should be looking for that could be making the clacking sound if my trans isn't the culprit? I already plan on checking the flywheel nut torque once I remove the clutch (I machined the flywheel last time it was apart). Any help is much appreciated.
In summary, is there a way to check the input shaft bearing condition without disassembling the trans? Is there something else that I should be looking for that could be making the clacking sound if my trans isn't the culprit? I already plan on checking the flywheel nut torque once I remove the clutch (I machined the flywheel last time it was apart). Any help is much appreciated.
Does it occur with the clutch totally engaged, i.e., idling or under power with foot off the pedal? If it does then it's not a surface irregularity or finish issue. If it only occurs at partial engagement , i.e., clutch still slipping, then it's likely related to clutch surface irregularity or uneven finish.
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#8
With regard to the clutch surface causing chatter, I have a question:
Does it occur with the clutch totally engaged, i.e., idling or under power with foot off the pedal? If it does then it's not a surface irregularity or finish issue. If it only occurs at partial engagement , i.e., clutch still slipping, then it's likely related to clutch surface irregularity or uneven finish.
Does it occur with the clutch totally engaged, i.e., idling or under power with foot off the pedal? If it does then it's not a surface irregularity or finish issue. If it only occurs at partial engagement , i.e., clutch still slipping, then it's likely related to clutch surface irregularity or uneven finish.
#9
Eats, Sleeps, Dreams Rotary
iTrader: (283)
@tomsn16 any idea why that is?
"I've done probably 100+ clutch jobs on FD's and FC's. I have NEVER resurfaced a flywheel.
If you see major damage, replace it. If not, scuff with sandpaper, clean, and go.
I've seen way more cases of flywheels permanently screwed up by having them machined than doing any good.
Yes, it will look "burnt" - ALL flywheels look like that, even after a few hundred miles of driving easy. The clutch doesn't care what it looks like."
#10
Racecar - Formula 2000
Doesn't sound like a FW balance or surface issue. Also doesn't sound like a TOB issue. Like you said, something inside the trans.
Last edited by DaveW; 11-30-23 at 05:56 PM.
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Sgtblue (12-01-23)
#11
I'm going to double check flywheel nut torque and inspect the flywheel the best I can. If anything looks suspicious I'll order a new flywheel just to be safe. ACT has a hell of a deal on their Streetlite Kit (600145-02) right now. Has anyone had any negative experiences using this on a mostly stock car with sequential twins?
#12
Eats, Sleeps, Dreams Rotary
iTrader: (283)
I'm going to double check flywheel nut torque and inspect the flywheel the best I can. If anything looks suspicious I'll order a new flywheel just to be safe. ACT has a hell of a deal on their Streetlite Kit (600145-02) right now. Has anyone had any negative experiences using this on a mostly stock car with sequential twins?
#13
I took the clutch off and everything looked great. Flywheel nut torque checked out ok. I couldn’t find anything wrong, so I added some grease to the pilot bearing and torqued the pressure plate back on. Then I pulled the alignment tool out and saw this. I believe I’ve found the source of the noise: input shaft flopping around because the pilot bearing exploded.
#14
Racecar - Formula 2000
I took the clutch off and everything looked great. Flywheel nut torque checked out ok. I couldn’t find anything wrong, so I added some grease to the pilot bearing and torqued the pressure plate back on. Then I pulled the alignment tool out and saw this. I believe I’ve found the source of the noise: input shaft flopping around because the pilot bearing exploded.
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