Manual Gearbox Transmission Clunk

3

348azeus

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My 4200 manual has developed a fault - need to take a look at the weekend but its as if there is a broken mounting. Going on and off throttle produces a clunk which you can feel at the lever. Any ideas?....hope it's not internal - trying to drive in slow traffic is not so smooth.
 
Parisien

Parisien

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348azeus said:
My 4200 manual has developed a fault - need to take a look at the weekend but its as if there is a broken mounting. Going on and off throttle produces a clunk which you can feel at the lever. Any ideas?....hope it's not internal - trying to drive in slow traffic is not so smooth.
Click to expand...

Hi 348, not sure if we've welcomed you to the forum yet, but I am doing so now!

I believe there is an issue with the cables to the box which become stretched over time, they will require adjustment just like the handbrake cable...if this is the case a relatively simple fix......, where are you based so you can avail of a good indie?


P
 
3

348azeus

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Hi,
I think you have said hello but two are better than none !
I've been in Italy for a good part of the year off and on so have browsed occasionally and not posted a great deal as I had nothing useful to say !
Maybe my gear lever comment was a bit of a red-herring - this feels more like the tranaxle and it's being transmitted to the lever- had a similar thing years ago on an Alfetta GTV6 where the mountings had perished - optimistically hoping for something similar. I will take a look on the Eurospares website to see how it's mounted.
If it's simple I'll do it - if it's complicated I can get to anyone from Leeds to London.

regards

Leo
 
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Parisien

Parisien

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348, am sure some of the more mechanically experienced guys will pass by over the next 24 hrs and offer further opinions.....hope its something simple, have you checked all relevant fluid levels, when were they last changed?


P
 
3

348azeus

New Member
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27
Update - Not so good !

I've had the car up on a ramp this morning and checked that there is nothing loose or broken.

Seems to be from where the torque tube fixes to the engine - anybody have a diagram of what's in there - can't see anything other than a very expensive torque tube on the Eurospares website but it seem likes its something like a spigot bearing. Any help greatfully received.

leo
 
Parisien

Parisien

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348azeus said:
I've had the car up on a ramp this morning and checked that there is nothing loose or broken.

Seems to be from where the torque tube fixes to the engine - anybody have a diagram of what's in there - can't see anything other than a very expensive torque tube on the Eurospares website but it seem likes its something like a spigot bearing. Any help greatfully received.

leo
Click to expand...

Leo, there was a torque tube for sale on ebay recently...not sure how advisable it is to put a 2nd hand one on...?!

Will check later to see if I have a record of it,

P
 
3

348azeus

New Member
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27
Like an idiot I thought the clutch was at the back Alfetta style but seeing a picture |I release where the noise is coming from and I'm now inclined to think it's something that was not replaced when the clutch was done or that has collapsed subsequently. Would like more clues before it's stripped down though. Do manual clutches need balancing or is it just the CC ?
 
G

gilles

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Hi 348azeus


First let me present myself. I am from France and i just bought a coupe GT MY2005 (manual box) with 52000 kms

Seems i have the same problem as you have

When running and lifting on/off the throttle, whatever gear is engaged, i get a "Clong" ot "Clunk" in the car body (seems it's comming from rear). Same when changing gears on strong accelerations


Did you got a solution since ?

Thanks a lot for helping.
 
davy83

davy83

Member
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2,829
The torque tube is the transmission shaft i presume? In which case it could be one of the universal joints, or the diff or one of the rear drive shafts might all create clunks. try moving these parts with your hands, see if you rotate them in opposite directions whether there is any clicking, or movement? (be careful the diff will allow some movement even when its ok) Another tell tale for joints in the drive train is going from power on to overrun very gently at low speed with the windows down while driving next to a wall. You will clearly hear it if part of the drive train is "clunking". you might if you are lucky be able to work out roughly where its coming from? you can also try putting the back wheels off the ground and rotate the wheel one way and the other and you should get the same clunking if its in the drive train (not sure if the LSD will make this not a good test?). Once you have worked out which bit is the problem the fix is not so easy as has been said a second hand part will have a finite life and so fitting it will only fix the problem for some time. A new one will cost a lot more (the torque tubes are serious money!). Some of the older cars you could change the universal couplings but i am not sure with this car, i also think balancing is important. I note the Eurospares only list the complete prop shaft so that does not bode well for joints being available separately.
 
Parisien

Parisien

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Or take it to a garage which has an electronic chassis ear...drivetrain/transmission/suspension noises hard to nail down.

Loz did list a company who do balancing of torque tubes.....


P
 
BennyD

BennyD

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15,007
As far as I'm aware, the transmission shaft (prop shaft) runs inside the torque tube which is just a tube that connects the front mounted clutch to a rear mounted gearbox. It mounts on flanges at either end and provides a measure of rigidity to the transmission (and car if it's a spyder). If anything needs balancing/repairing I am pretty sure it is the prop shaft and not the torque tube.
 
rs48635

rs48635

Member
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3,181
My 3200 has a little bit of driveline shunt. Maybe slightly more than it had when I got it but nothing to concern me. Clutch is the "replaceable component" in the drive-train.

Think "torque tube" describes item connecting engine to transaxale.
Runs at engine speeds!!! 7000rpm - so encased in a rigid tube. Critical it is balanced, straight and has perfect couplings

4200
ENGINE-CLUTCH---------torque tube---------GEARBOX/DIFF


Normal drive / prop shaft rouns at reduced speed (G'box output shaft). Still need to be ok, but maybe little less critical.
3200
ENGINE-CLUTCH-GEARBOX---------drive/prop shaft---------DIFF
 
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