Vibration after clutch change

[willwal98]

Hi guys,

I've recently fitted a new clutch kit to the 1g-gte (Ra28) and it seems I have a bit of a vibration now. It changes with RPM and doesn't matter if I have the clutch pedal in or out. The harmonic balancer looks ok (easy way to check?). I have the flywheel machined while it was out (reputable guy that I trust with all my work) and put a new spigot bearing and throw out bearing in.

Now does anyone have any idea where else to check for the problem or what else to check to help narrow it down? I'd really rather not pull the box out again (anyone with a 1ggte in an old skool celica will understand) but if I have to I will.

Oh the clutch is a HD PBR kit.

Thanks
will.

[Draven]

harmonic balancer.. the only way to check is to get up close with it and check condition of the rubber part.
Bear in mind that the harmonic balancer is on the same thing as the flywheel, so the machining of the flywheel could well be the cause, resulting in increased vibrations.
Generally the throw-out bearing noise goes away if you put the clutch in, so you can count that one out.

[Norbie]

Get the pressure plate checked out, it could be out of balance. This happened to me when I bent my pressure plate (long story), it caused a nasty vibration as you described. The friction surface only needs to be very slightly off-centre to cause problems.

[LeeRoy]

What did u use to align the clutch plate as they can be out a little bit and cause vibration. It looks like it may be coming out again.

- LeeRoy

["Z" UTE]

Nooo Noo LeeRoy, before you jump on the clutch as being the problem do this;

Drop your tail shaft out and turn it 180 degrees.

Has fixed small vibes many times, We get lazy, and dont bother marking the shaft!

cheers Chuck.

[LeeRoy]

Thats a pretty good idea. But why would that be the problem assuming both have worked out of balance together and now they aren't synchronised. Cause both would come balanced from the factory or where they were made assuming it was done properly.

[o_man_ra23]

Nooo Noo LeeRoy, before you jump on the clutch as being the problem do this;

Drop your tail shaft out and turn it 180 degrees.

Has fixed small vibes many times, We get lazy, and dont bother marking the shaft!

cheers Chuck.

Good call... but to identify if its before/after the cogs, check whether the vibration is there if you are stationary. If the vibration is not present when stationary, it is likely to be in the tailshaft. If it changes on the gear change, then its likely to be on the motor side, if it doesnt change with the gear change, its likely to be tailshaft.

Just logic, but good that you identified that possibility Chuck.

Cheers, Owen

[Draven]

I assumed from his description that it was happening based on rpm, not road/gbox speed.. thus anything after the clutch can be removed from the equation

["Z" UTE]

LeeRoy, I should have asked, is the vibration evident only when driving, or is it present all the time?.

If the vibe is present when the vehicle is stationary, disregard my previous post.

As to your last question, a minor imbalance in the shaft is the usual cause.

cheers Chuck.


DRAVEN O Man 23 you both beat me to it. Took a phone call while typing the response hah.

[LeeRoy]

Dude its not my thread its wilwal's

[willwal98]

sorry, did try to post earlier but net was being stupid.

Vibration is there when stationary so nothing past the input shaft of the box i'd say.

LeeRoy - When you say the clutch plate could be out, I though that since it sits on the input shaft it would keep that in place and from the couple of boxes I have done I could not get the shaft in unless the clutch plate was inline. And the pressure plate is aligned with dowels on the flywheel.

I had suspected the flywheel myself but really don't want to pull the box out until every thing else has been looked at.

Norbie: How would I go about getting the PP checked? Just take it to a machine shop or would I need the flywheel etc as well?

[Norbie]

Definitely can't be the driven plate; the input shaft will keep this nicely centred. I strongly doubt it's the flywheel, you'd have to stuff up the machining very badly to make it out of balance. Anything behind the clutch is out based on the described symptoms, and while the harmonic balancer is a possibility it's not the first place I'd be looking; the problem occured after a clutch swap so logic suggests it's something directly related to the clutch.

By process of elimination the pressure plate is the most likely cause of the problem. Take it to a clutch specialist to get it checked out.

EDIT: if you're in the Brisbane area I can recommend Direct Clutch in Albion. They built my clutch and also fixed it after I bent it.

[LeeRoy]

Well if it's not centered then when u put the box on it can be really hard to get on and if u tighten it up it will pull it on and be all tight and on properly but the clutch plate will be off center. This happened in a friends escort but i have a feeling that after driving it for a while it worked its way into the center and gradually got less and less vibration.

Like they said above with the tailshaft balance this like a fairly hight possibility and so does the pressure plate balance.

- LeeRoy

[purple5ive]

Generally the throw-out bearing noise goes away if you put the clutch in, so you can count that one out.

what exactly is this noise i have it in my soarer as soon as i push the clutch pedal in it goes away and release the pedal out it comes back

is this going to affect anything in the gearbox or is it normal

cheers

[LeeRoy]

It's a rooted bearing in the bellhousing that disengages the clutch and whn u push on the pedal it puts force on the bearing and if its rooted it will squeal and then smoke when its bad enough and then finally completely die. It's not normal and u should change it.