A Little Frustrated With Re-built Gearbox....again!

[superspit]

hey punters...

As some of you would know, I had my box removed and stripped to try and identify a noise that was coming emanating from it.

This 'noise' was pulsing at the same frequency as the engine rpm, and those 'oscillations' were feeding back to me via the clutch pedal and gear stick.... (my foot always rests on the clutch, it's just too big to put on that silly little foot rest)...

These 'pulses' occured in every gear (reverse also), when under some/a little load....almost a 'dull clicking' noise, from the gearstick!..(not the diff..lol!)

Ok..so the car's back (for a week now)....and as I get settled back into the feel of the car, am noticing that just in first and reverse gears now, that pulsing noise/feel is still emanating via the clutch, just a little, and only at very low/natural take off speeds.

It's barely audible, it's mainly that pulsing feel from the clutch (feedback) and the stick.

My other mechanic (not the guy I bought it from) drove it and said that this was the best manual V35 he'd ever driven, and he seemed to actually mean it.

But I'm a fussy kuunntz (prolly too fussy??), and therefore am throwing this issue over to you 6M guys....to see if you can replicate/understand/realise as normal (whatever) this thing.

Does your clutch/stick 'feel' engine RPM on take off?

I know that the V6 design (in general) isn't the most balanced engine format, physically speaking, (compared to a smooth inline 6)....

Is this normal...do ya feel it too?

cheers people......and have a great day! (a cooler one too!)

[superspit]

BUMPEY!

C'mon guys...how bout this...

do you feel any feedback through your clutch or gear stick when taking off or place your car under some load?

[The Bogan]

Dont know about the box but you will stuff the clutch resting your foot on the pedal.

[superspit]

Dont know about the box but you will stuff the clutch resting your foot on the pedal.

ok....thankyou MLR.

I guess that's not quite the response I'm aiming for....but I DO appreciate it.

Cheers.

[MOV35GT]

How was the gearbox mount when the box was pulled out, sometimes when these wear out you might get some vibration, maybe check engine mounts are tight/good condition as well.

Clutch thrust bearing, do you still get the noise with the clutch pedal in(to the floor)?

Just a thought, check you haven't flat spotted a tyre.

Edited February 9, 2009 by MOV35GT

[superspit]

How was the gearbox mount when the box was pulled out, sometimes when these wear out you might get some vibration, maybe check engine mounts are tight/good condition as well.

Clutch thrust bearing, do you still get the noise with the clutch pedal in(to the floor)?

Just a thought, check you haven't flat spotted a tyre.

good point...I didn't ask about the actual mounts...they didn't mention anything there.

Thruster and spigot bearings are brand new...so too the fly wheel..(which is a more complex unit than I've ever seen).

Thrust bearing is good...

Mounts....geeee...I'll have to check that.

Car went in for a front and rear bumper re-spray......so i get her back on Friday. (Ultrafine BW)

I'm not taking her straight back to Frank (the seller), I'm going to Tony at TGS, (also a 24/7 warranty registered dealer) give him the car to use for a couple of days (as a daily driver, learn the car, if I can put it that way)

I'll get him to look more specifically at mounts......mmmm...never thought of that.

Thanks man!....

(i'll keep taking suggestions of that calibre!!)

[Touge Kyousou]

Kinda hard to imagine what you're trying to convey with just words..

Not much help but my gearstick and clutch pedal gives feedback too.. as in i can feel the clutch against the flywheel manifesting as vibrations and slight noise and the gearstick also vibrates a bit. Oh, i can also feel vibrations/oscillations of the gears as rpm increases

I'm not the least bit worried about it though, it's a getrag box and from what i've felt and read, their boxes are tough but not smooth/refined..

Adds an element of toughness if you ask me lol...needs it too, car is so refined in stock guise.

[superspit]

Kinda hard to imagine what you're trying to convey with just words..

Not much help but my gearstick and clutch pedal gives feedback too.. as in i can feel the clutch against the flywheel manifesting as vibrations and slight noise and the gearstick also vibrates a bit. Oh, i can also feel vibrations/oscillations of the gears as rpm increases

I'm not the least bit worried about it though, it's a getrag box and from what i've felt and read, their boxes are tough but not smooth/refined..

Adds an element of toughness if you ask me lol...needs it too, car is so refined in stock guise.

wow!....for someone who was struggling with my explanantion, you've managed to respond wonderfully!!!

This is exactly the type of response I was looking for........in that, at least, I'm not alone.

It's just that it feels rather cheap, imho, not like a 35K car.....my other lines were rougher, but not like this, not in the clutch/gearbox, by way of feel.

Maybe it is the combination of the (naturally unbalanced) V6 format, and the Getrag?....I hope I can get it smoothed out, just a little.

(again, I am quite fussy with this kind of shit).

Thanks again!

[Stephen Thorpe]

How are the clutch plates, are they glazed because that will cause massive vibration...

You mention the clutch bearing is new but if the plate has a bit of uneven wear or is 'polished' it will cause a bad vibration when the gear engages.

Also, I am sorry to say but if you rest your foot on the clutch, you will cause this glazing of the friction plate and you will need to stop that.

At the very least, if you are hoping that it is a warranty fix I would suggest that you don't publicise it too much.

[superspit]

How are the clutch plates, are they glazed because that will cause massive vibration...

You mention the clutch bearing is new but if the plate has a bit of uneven wear or is 'polished' it will cause a bad vibration when the gear engages.

Also, I am sorry to say but if you rest your foot on the clutch, you will cause this glazing of the friction plate and you will need to stop that.

At the very least, if you are hoping that it is a warranty fix I would suggest that you don't publicise it too much.

Clutch is a brand new item.....flywheel is brand new too....the clutch (in itself) works wondefully!...no complaints.

Resting a foot on a clutch, the way I do, will not cause damage, (I don't 'ride' the clutch)....(please, let's move away from this aspect).

I just can't fit my big foot onto that footrest; also the clutch actuator lever is bent at right angles, and in a way that impedes my foot fitting onto the footrest.

Anyway, I will dismiss that as a problem, as all these componenets are new...(haven't had the chance to glaze!)..I'll review that again in the future, when I work this initial noise out....

(the reason that I mentioned 'foot on clutch'/'hand-on gear stick' was to establish and convey to you all this noise/vibration/oscillation that is proportional to engine rpm (as in prior post(s))...please don't take that as being the issue, but rather as the explanation.)

I simply don't understand your last sentence there Stephen....everything is above board, simply looking for some support and maybe helping people who may in future find this issue....I'm lucky that I have warranty....(maybe I've missed a legality or something mate?)

Cheers....really appreciating this renewed feed-back!

[Stephen Thorpe]

Clutch is a brand new item.....flywheel is brand new too....the clutch (in itself) works wondefully!...no complaints.

Resting a foot on a clutch, the way I do, will not cause damage, (I don't 'ride' the clutch)....(please, let's move away from this aspect).

I just can't fit my big foot onto that footrest; also the clutch actuator lever is bent at right angles, and in a way that impedes my foot fitting onto the footrest.

Anyway, I will dismiss that as a problem, as all these componenets are new...(haven't had the chance to glaze!)..I'll review that again in the future, when I work this initial noise out....

(the reason that I mentioned 'foot on clutch'/'hand-on gear stick' was to establish and convey to you all this noise/vibration/oscillation that is proportional to engine rpm (as in prior post(s))...please don't take that as being the issue, but rather as the explanation.)

I simply don't understand your last sentence there Stephen....everything is above board, simply looking for some support and maybe helping people who may in future find this issue....I'm lucky that I have warranty....(maybe I've missed a legality or something mate?)

Cheers....really appreciating this renewed feed-back!

If it is all new, has it bed in yet?

Perhaps your clutch pack is out of balance.

As for 'moving away' no problems if you are happy with what you do. Clutch clearances are very minimal though.

[NISMO]

What flywheel did you go with?

If you've gone factory then it shouldn't be related. If it's aftermarket could be a different feeling your getting due to the flywheel. The stock item is a dual mass flywheel which dampens, noise, vibrations etc etc. A lot of aftermarket items, actually pretty much all, are not dual mass and so you might be feeling this, rather than what was the prob before.

When i changed my clutch it definitely was the case, but i knew it would happen before i did it so no real surprise.

[superspit]

What flywheel did you go with?

If you've gone factory then it shouldn't be related. If it's aftermarket could be a different feeling your getting due to the flywheel. The stock item is a dual mass flywheel which dampens, noise, vibrations etc etc. A lot of aftermarket items, actually pretty much all, are not dual mass and so you might be feeling this, rather than what was the prob before.

When i changed my clutch it definitely was the case, but i knew it would happen before i did it so no real surprise.

Hi Nis,

Ima gunna ring Frank...get the specifics, as per your question on the flywheel.

I just don't like it feeling so cheap and clanky, mainly on gentle take off...!..I'll get back to you!....

[scathing]

I get a fair amount of vibration through the driveline in the Z33. I can't say I feel any specific pulsing, but it does make a noise.

evo magazine recently published a 350Z buying guide online. The site's down right now, but I am pretty sure the checkpoints say something about a noisy driveline as well. Have a look later.

With shared componentry, I can't see your car being immune to it either.

[superspit]

I get a fair amount of vibration through the driveline in the Z33. I can't say I feel any specific pulsing, but it does make a noise.

evo magazine recently published a 350Z buying guide online. The site's down right now, but I am pretty sure the checkpoints say something about a noisy driveline as well. Have a look later.

With shared componentry, I can't see your car being immune to it either.

Heeey!..Thankyou!

That's a great write up!..enjoyed reading that, and it did actually make me feel a little better, and more informed of this 'issue' of driveline...(or non-issue rather).

I saw Tony at TGS today,..once I get it back from the spray painter's we're taking it on the freeway, where I found the higher RPM issue/sounds...then we'll put around (slowly) and figure out the pulsing noise in first gear take off.

It could be all normal...there might be something amiss...we'll see.

[BLISTC]

my driveline has no noise only when cold you can hear a like a bearing noise... but once it warms up it goes away.

however there is NVH which i can feel through the shifter and the gear pedal however i consider it to be normal

[superspit]

my driveline has no noise only when cold you can hear a like a bearing noise... but once it warms up it goes away.

however there is NVH which i can feel through the shifter and the gear pedal however i consider it to be normal

Hi BLISTC!

NVH?.......please explain?

Is this noise/vibration heard/felt via your stick/pedal directly proportional to your engine RPM? ...or again, is it just the typical 'bearing' sound?

Cheers!

[Stephen Thorpe]

I think what BLISTC was saying is that there is NVH (Presumably Slight) that is felt "through the shifter and the gear pedal however" he considers "it to be normal"

[superspit]

I think what BLISTC was saying is that there is NVH (Presumably Slight) that is felt "through the shifter and the gear pedal however" he considers "it to be normal"

Hi Stephen....

lol..my fault...I meant to say...."what does NVH mean???"....lol!

Is it some form of 'harmonic'/vibration description?

[Stephen Thorpe]

Hi BLISTC!

NVH?.......please explain?

Is this noise/vibration heard/felt via your stick/pedal directly proportional to your engine RPM? ...or again, is it just the typical 'bearing' sound?

Cheers!

Oh, I thought you knew... you were so close with this response that I ignored the "please explain" response.

NVH means

Noise Vibration and Harshness...

mainly to do with most things that are engineered, especially Cars.