Strange Driveline Noise After Clutch Install

[alex.a]

hey guys

need some help trying to track down an annoying driveline noise in my r32gtr.

started after i got my solid center twinplate clutch rebuilt.

strange noise, almost sounds like chirping tires!! happens when i release the clutch after a gear change and the revs have dropped or if i dump the clutch at low revs... squeek!!

i assumed i may have had some loose bellhousing bolts, allowing the gearbox to slightly vibrate against the flex/spacer plate (goes between bellhousing and block)when the clutch bites in.

i checked the bolts and found 2 semi loose ones, the rest are super tight... did them all up extra tight improoved the problem but its still there.

one thing is i remember there was a rubber gasket stuck to the flex/spacer plate i peeled off before i re-installed everything (it looked rooted)..

checked my engine/gearbox mounts and they are all fine... even replaced my greabox crossmember rubbers... no effect

if anyone else has had this problem please help!!!!

[The Dan]

The spigot bush is worn out or missing

[alex.a]

brand new spigiot... old one was shagged

[The Dan]

brand new spigiot... old one was shagged

Then the spigot was damaged on installation.

Who installed it and is the engine the same one from the car?

Is the flywheel the same one the car came with?

And how shagged was the old spigot and in what way was it shagged?

[alex.a]

old spigot as dry and picked up on the input shaft... looked like it had been bashed into place and damaged when fitted.

i installed the new spigiot and clutch. was extremly careful on install.

if there was spigiot damage then wouldnt there be constant noise??? as the crank is obviously always spinning?? what makes you say its spigiot??

the noise is not constant, only when the clutch is dropped hard or suddenly released when the wheel speed is higher then the revs... if that makes sense lol.

i checked the imput shaft for abnormal movement before i put the box back in also.... was all fine.

the clutch is a exceedy/nismo SOLID center twin-plate (harsh). it was rebuilt buy npc however the didnt reuse any part of the original clutch plates, they made up their own new units. i have the old ones at home.

the flywheel was machined and new flywheel bolts were used.

Edited September 9, 2009 by alex.a

[The Dan]

I am suggesting spigot because that is the noise it will make when it is worn or incorrectly installed.

The noise is created because the input shaft is allowed to flex too much on the take up point.

When you say flex plate, are you referring to the spacer plate for the starter motor locating or a flex plate (which belongs on an automatic)

I know probably aren't referring to the latter but correct terminology will help.

If the gearbox was not on tight or straight then it would have immediately damaged the spigot bush. The noise will only be there when the input shaft is under high load at only a certain point when it is allowed to move on a horizontal plane.

So no, it won't be there all the time. It will only be there when you are halfway through the engage point just as the clutch takes up. Or on decel under the same conditions.

You don't still have the auto spigot in place and just bashed the new spigot into the whole did you?

I have seen it done before and it just crushes the spigot. You didn't answer the original engine/gearbox question so it's hard to tell.

How did you install the bush? Did you lubricate it correctly?

[The Dan]

double post

[alex.a]

its a r32gtr as stated in origional post.

sorry yes i ment the spacer plate for starter location. its a strange metallic noise.. if im driving ans bleep the accelerator between gear changes it wont do it.

old spigiot was removed, and i got some sort of grease and a plastic/nylon dowel from a local gearbox shop. the dowel was used to tap the new spigiot into place. i put the spigiot into the freezer over night before the install to "shrink it" to allow it to insert into the crank.

when i installed the spigiot it wend in with an ease.

might pull the box out again and have a look at the spigiot if i get time.

thanks for your input anyway mate... i really appreciate it

[The Dan]

1. Don't freeze the spigot. It needs to be an interference fit

2. Sounds like you didn't oil the spigot, so it's going to be dry as a muthaf**ka.

3. Why would you freeze the spigot. I mean, I know why but who gave you that advice?

Put the bush on the tip of your pointer finger. Fill it with engine oil right to the top. Then squeaze the top in with your thumb hard until the oil comes out through the sides of the bush. Now look at your properly oiled bush.

Then get a 3/8th drive 15 or 16mm deep socket and use the back end of it (where the wrench attaches) to tap it gently into place. You will notice it requires minimal effort.

Also, don't use anything but a genuine bush. There is a difference between them and other bushes. Aftermarket bushes are not as high quality.

[alex.a]

yes it was a genuine bush, i was told to freeze it so it would contract/shrink a little so it would fit in easier.

i packed it with the grease i was given and squeezed either side... its should have plenty of lube. anyway i will rip it out later this week and see whats goin on.

thanks

[The Dan]

once again,

1. Don't freeze it

2. OIL the bush, don't GREASE it

[alex.a]

rito mate i get it.

dont freeze...

grease=no

oil=yes

will post up a pic of my findings