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Discussion Starter · #1 ·
Sometimes, when I stop in traffic then am in neutral.. when I engage 1st to move off again I get / hear this clunk (or dull thud) from the bottom of the car.. sounds as if its coming from the trasmission tunnel ?

Please tell me this is normal.. sometimes I don't get it at all ?

regards


Rich
 
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Discussion Starter · #2 ·
I have the same thing happen as well. Only it seems more noticeble sometimes more than others, could be that the handbrake is one when your re-engaing first thus more noticeable. Its when the drive train is being re-gengaed with the gearbox, just that its seperated just by the clutch instead of neuteral.
Does this noise, also the car moves slightly, mean that the clutch is on its wayout, or something else, which I carnt see being any worse than the clutch going.
Cheers
Al
 
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Discussion Starter · #3 ·
Are your cars reasonably high mileage? My old and current Galant ZR4 has/had the same sort of problem. It was just that the driveshaft(?), excuse my total ignorance but you know the pipe thingee that sends the power down to the rear wheels, has got a bit loose and simply needs tightening. On my old car it started doing this close to 100,000km or so but I never bothered to get it fixed. My Evo3 hasn't started doing this (yet?).
 
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Discussion Starter · #4 ·
Hi,
Check the Backlash on the rear diff, There should be movement of 5mm max on the propshaft.
Jack up the back of the car, put one mark on the rear of the propshaft flange and another on the rear diff casing so that you can clearly see them aligning. Then with the handbrake on grap hold of the propshaft and try and turn it each way, you will be able to measure the backlash using the two marks as reference points.

Regards,
Paul.C
 
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Discussion Starter · #5 ·
I agree with GSRed, a clunk on taking up drive (you may also hear it when taking your foot off the throttle suddenly but that is less likely) could be worn CV worn joints in the propshaft or excessive backlash in the rear diff. Check the backlash as he describes on the diff and also at all the CV joints (I think there are 4 on the E6 prop). I had the same thing on my old TR7 (cough, cough, no one heard that did they?) that had covered 70,000 miles, it usually only occurs at high miles. I just left it alone as it would have covered another 70,000 miles before it was a major problem rather than fork out of a recon rear diff straight away.
It is worth checking it out though on an Evo as they have to contend with a lot more torque than my old wedgemobile did. If it is the prop then to fix it you need a whole new prop anyway so you might as well wait until it gets more noticeable. If there is excessive backlash on the rear diff then ouch! Drive it until it fails as the cure according to the Workshop Manual is a new diff!

By the way can prop specialists put on new CV joints?
 
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Discussion Starter · #6 ·
JacKal,
Cud also b the prop shaft centre bearing , it cud b worn or the housing cud b loose at the mounting with the trans tunnel .
There is also a resiliant rubber coupling on the propshaft 2 rear diff flange , this cud b worn.
All this on a VI btw.
Wot Evo do u have ? How many miles?
I wud b inclined 2 check these b4 checking diff backlash.
H,
The propshaft has universal joints not CV's ,and a prop specialist shud b able 2 replace them.
 
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Discussion Starter · #8 ·
My car does it too, but I can't hear a noise. The car just moves slightly, but not much. It does it every now and then, but has always done it and I'm not too worried as I think this is fairly normal for cars with permanent 4WD and esepecially as the Evo's system hasn't been fine tuned for normal traffic like an Audi...
 
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Discussion Starter · #9 ·
Yep this happens on mine too... Evo6 withy 17,000 miles on the clock.. tricky to get the dealer to look at it because it doesnt always do it !!!!

Found that if you put the clutch to the bite point and then drop it you can replicate the noise and movement.. don't know if this is the same thing but kind of worrying... best i get that checked out too !!!!

Jevo
 
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Discussion Starter · #10 ·
My EVO VI makes the same noise too. Again, it doesn't do it all the time and only when putting it into first.

Might be my imagination, but seems to happen once you've done a lot of town driving, although this could be because you're changing gear more often....

Anil
 
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Discussion Starter · #11 ·
So if there are so many that do this.... is it a problem or another quirk we have to live with???

Jevo
 
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Discussion Starter · #12 ·
If the noise gets a lot worse and is virtually all the time when you accelerate or lift off then start worrying if its only occansional then don't worry. The symptoms only really get bad at very high miles or if the transmission has been abused continuously for a long time (i.e. loads of 0-60 runs etc.).
Just my opinion.
 
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Discussion Starter · #13 ·
Shud have said mine does this 2 , Anil said the majic phrase , town driving .
This heats up the clutch and causes slight drag , so when u change into first the drag will put torque into the g/box and we have Mr clunk.
2 minimise don't sit stationary in gear with the clutch out....no offence 2 those that don't do this , but I know some do
 
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