That mystery grinding noise typically after a clutch job
10-20-2008, 07:31 PM
#21
[COLOR=black][FONT=Verdana]Yeah I used the OEM jack that came with the car to push it up. It seemed to be a temporary fix though; the noise is back in full force. Mine is pretty damn spot on to the noise yours makes. I feel like a douche every time I get up above 3000 RPM people probably think my engine is about to explode.
If it means anything at all my Hi-Flow cat is relatively new within the last year or so and the noise was present back then too.
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10-20-2008, 10:16 PM
#24
Thought i'd chime in on this with my results...
I just went for a drive after realigning my ppf and the noise is just about completely gone. If I listen very closely I can faintly make out some of the noise still, but then again I used a tape measure and quickly converted MM to Inches in my head. My PPF is at 2 5/8" from the frame rails. I bet if I were more precise with it i could get rid of this noise 100%.
I just went for a drive after realigning my ppf and the noise is just about completely gone. If I listen very closely I can faintly make out some of the noise still, but then again I used a tape measure and quickly converted MM to Inches in my head. My PPF is at 2 5/8" from the frame rails. I bet if I were more precise with it i could get rid of this noise 100%.
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10-21-2008, 02:37 AM
#25
Thought i'd chime in on this with my results...
I just went for a drive after realigning my ppf and the noise is just about completely gone. If I listen very closely I can faintly make out some of the noise still, but then again I used a tape measure and quickly converted MM to Inches in my head. My PPF is at 2 5/8" from the frame rails. I bet if I were more precise with it i could get rid of this noise 100%.
I just went for a drive after realigning my ppf and the noise is just about completely gone. If I listen very closely I can faintly make out some of the noise still, but then again I used a tape measure and quickly converted MM to Inches in my head. My PPF is at 2 5/8" from the frame rails. I bet if I were more precise with it i could get rid of this noise 100%.
Tried that.. I used a ruler with millimeters and got it right at 65mm. It seemed like it helped at first but the noise is just as bad now
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10-21-2008, 01:13 PM
#26
Upon more driving and closer listening this morning i can still hear it fairly clearly for about 200rpms between 3 and 4 but it is still a 95% improvement from before.
nicacus, try rotating your driveshaft on your diff like someone mentioned earlier. That sounded like a good idea to me.
nicacus, try rotating your driveshaft on your diff like someone mentioned earlier. That sounded like a good idea to me.
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When I do I'm gonna mark everything with spray paint before unbolting anything so I can reassemble it exactly the way it was before.
10-21-2008, 07:27 PM
#35
Mine is audible in neutral too. Rev up to ~2k and let off it does it. Might try doing it with the clutch in and seeing if it makes the noise to rule out any other possibilities. I'm almost certain it has nothing to do with the transmission back. I'll haul out my recording equipment to my car and get a high quality sound clip when I have time.
What's really frustrating is that we've already eliminated so many variables and there's not a whole lot left. I haven't checked but I'm pretty sure I don't have the lightweight flywheel. The last guy raced it, and it's possible, but I'm pretty sure I don't considering I didn't have noises on decel when I first got it.
Heat shields don't seem to be the cause of it. Mine aren't loose, there's no rocks or anything lodged and the sound just isn't consistent with heat shields.
I've read that this is isolated to earlier models of NAs, typically 90s. What's the difference then between early 1.6 NAs to the later 1.8s?
Diff is out, drive shaft is out and transmission is out because A.) the noise can be produced in neutral ( drive shaft/diff is out ) and B.) this is the third transmission I've swapped in (unless all three of my transmissions we're fucked which I believe is unlikely)
Places I need to check: I've noticed both nicacus and I are running Voodoo II kits. Maybe our motor mounts are junked and the turbo happens to be rattling against the area that we cut and bent in to clear room for the turbo. Doubtful, but it's worth checking out.
Starter? It's constantly being run with the engine regardless of the clutch being in or out. Although I'm not sure why, given the conditions, it would make that noise.
As precisely as possible we need to find out where the noise is coming from and address any moving parts in that area.
Well, if we continue to rule out possible factors eventually we'd have to hit home, right?
What's really frustrating is that we've already eliminated so many variables and there's not a whole lot left. I haven't checked but I'm pretty sure I don't have the lightweight flywheel. The last guy raced it, and it's possible, but I'm pretty sure I don't considering I didn't have noises on decel when I first got it.
Heat shields don't seem to be the cause of it. Mine aren't loose, there's no rocks or anything lodged and the sound just isn't consistent with heat shields.
I've read that this is isolated to earlier models of NAs, typically 90s. What's the difference then between early 1.6 NAs to the later 1.8s?
Diff is out, drive shaft is out and transmission is out because A.) the noise can be produced in neutral ( drive shaft/diff is out ) and B.) this is the third transmission I've swapped in (unless all three of my transmissions we're fucked which I believe is unlikely)
Places I need to check: I've noticed both nicacus and I are running Voodoo II kits. Maybe our motor mounts are junked and the turbo happens to be rattling against the area that we cut and bent in to clear room for the turbo. Doubtful, but it's worth checking out.
Starter? It's constantly being run with the engine regardless of the clutch being in or out. Although I'm not sure why, given the conditions, it would make that noise.
As precisely as possible we need to find out where the noise is coming from and address any moving parts in that area.
Well, if we continue to rule out possible factors eventually we'd have to hit home, right?
Last edited by 9671111; 10-21-2008 at 10:06 PM.
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10-21-2008, 09:43 PM
#36
I have new mazdaspeed motor mounts that are maybe 4 months old, I changed them right after I put everything back together because I thought they might be the cause of the noise.
I checked that area near the turbo as well it doesn't look as if it is coming into contact with it at all as there is no signs of rubbing or bumping. maybe it has something to do with the FM hardware?? But this didn't start to happen until I switched my motor/clutch.
Rccote do you have a shortnose crank? the motor I have now is a shortnose, maybe something is going wrong with it?? I have no idea..
I'm not so worried about the decel noise I can live with that. I have the video/audio. I just have to wait until I am home to upload it. probably not for another four hours or so.
I checked that area near the turbo as well it doesn't look as if it is coming into contact with it at all as there is no signs of rubbing or bumping. maybe it has something to do with the FM hardware?? But this didn't start to happen until I switched my motor/clutch.
Rccote do you have a shortnose crank? the motor I have now is a shortnose, maybe something is going wrong with it?? I have no idea..
I'm not so worried about the decel noise I can live with that. I have the video/audio. I just have to wait until I am home to upload it. probably not for another four hours or so.
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10-21-2008, 09:54 PM
#38
Mine is audible in neutral too. Rev up to ~2k and let off it does it. Might try doing it with the clutch in and seeing if it makes the noise to rule out any other possibilities. I'm almost certain it has nothing to do with the transmission back. I'll haul out my recording equipment to my car and get a high quality sound clip when I have time.
What's really frustrating is that we've already eliminated so many variables and there's not a whole lot left. I haven't checked but I'm pretty sure I don't have the lightweight flywheel. The last guy raced it, and it's possible, but I'm pretty sure I don't considering I didn't have noises on decel when I first got it.
Heat shields don't seem to be the cause of it. Mine aren't loose, there's no rocks or anything lodged and the sound just isn't consistent with heat shields.
I've read that this is isolated to earlier models of NAs, typically 90s. What's the difference then between early 1.6 NAs to the later 1.8s?
Diff is out, drive shaft is out and transmission is out because A.) the noise can be produced in neutral and B.) this is the third transmission I've swapped in (unless all three of my transmissions we're fucked which I believe is unlikely)
Places I need to check: I've noticed both nicacus and I are running Voodoo II kits. Maybe our motor mounts are junked and the turbo happens to be rattling against the area that we cut and bent in to clear room for the turbo. Doubtful, but it's worth checking out.
Starter? It's constantly being run with the engine regardless of the clutch being in or out. Although I'm not sure why, given the conditions, it would make that noise.
As precisely as possible we need to find out where the noise is coming from and address any moving parts in that area.
Well, if we continue to rule out possible factors eventually we'd have to hit home, right?
What's really frustrating is that we've already eliminated so many variables and there's not a whole lot left. I haven't checked but I'm pretty sure I don't have the lightweight flywheel. The last guy raced it, and it's possible, but I'm pretty sure I don't considering I didn't have noises on decel when I first got it.
Heat shields don't seem to be the cause of it. Mine aren't loose, there's no rocks or anything lodged and the sound just isn't consistent with heat shields.
I've read that this is isolated to earlier models of NAs, typically 90s. What's the difference then between early 1.6 NAs to the later 1.8s?
Diff is out, drive shaft is out and transmission is out because A.) the noise can be produced in neutral and B.) this is the third transmission I've swapped in (unless all three of my transmissions we're fucked which I believe is unlikely)
Places I need to check: I've noticed both nicacus and I are running Voodoo II kits. Maybe our motor mounts are junked and the turbo happens to be rattling against the area that we cut and bent in to clear room for the turbo. Doubtful, but it's worth checking out.
Starter? It's constantly being run with the engine regardless of the clutch being in or out. Although I'm not sure why, given the conditions, it would make that noise.
As precisely as possible we need to find out where the noise is coming from and address any moving parts in that area.
Well, if we continue to rule out possible factors eventually we'd have to hit home, right?
The starter engages to start the engine. Then it goes back to doing nothing. So it should definitely not be spinning when the engine is running.
What brand and weight of oil do you run? It's "known" that heavy oil shuts up loud transmissions, but then they don't shift as well when cold. You're running an expensive high quality synthetic right?
And some parts in the transmission DO spin when in nuetral. Like the input shaft.
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10-21-2008, 10:03 PM
#39
+131243885732343 We need video of this sound.
The starter engages to start the engine. Then it goes back to doing nothing. So it should definitely not be spinning when the engine is running.
What brand and weight of oil do you run? It's "known" that heavy oil shuts up loud transmissions, but then they don't shift as well when cold. You're running an expensive high quality synthetic right?
And some parts in the transmission DO spin when in nuetral. Like the input shaft.
The starter engages to start the engine. Then it goes back to doing nothing. So it should definitely not be spinning when the engine is running.
What brand and weight of oil do you run? It's "known" that heavy oil shuts up loud transmissions, but then they don't shift as well when cold. You're running an expensive high quality synthetic right?
And some parts in the transmission DO spin when in nuetral. Like the input shaft.
I'm running Royal Purple 75w-90 right now, Mobile 1 full synthetic on the second, and Redline on the first all and still had the issue. All three transmissions sounded exactly the same. The difference is now my tranny shifts like butter. Though, it's become a tiny tiny bit notchy at times. I might have to bleed my slave sometime soon.
Could we rule out the input shaft if the sound can be produced while sitting still with the clutch in (disengaged). I really want to rule out the transmission and move on to other areas.
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10-21-2008, 10:08 PM
#40
So the starters out then.
I'm running Royal Purple 75w-90 right now, Mobile 1 full synthetic on the second, and Redline on the first all and still had the issue. All three transmissions sounded exactly the same. The difference is now my tranny shifts like butter. Though, it's become a tiny tiny bit notchy at times. I might have to bleed my slave sometime soon.
Could we rule out the input shaft if the sound can be produced while sitting still with the clutch in (disengaged). I really want to rule out the transmission and move on to other areas.
I'm running Royal Purple 75w-90 right now, Mobile 1 full synthetic on the second, and Redline on the first all and still had the issue. All three transmissions sounded exactly the same. The difference is now my tranny shifts like butter. Though, it's become a tiny tiny bit notchy at times. I might have to bleed my slave sometime soon.
Could we rule out the input shaft if the sound can be produced while sitting still with the clutch in (disengaged). I really want to rule out the transmission and move on to other areas.
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