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YOUR RESEARCHProp/Front diff knocking noise 996t
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Check play
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1
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911uk: 1 discussions
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Hi all, I've recently bought a 996 turbo s manual. I've noticed a clunk noise from roughly below the centre console area when coming off throttle and going back onto throttle at lowish speed.
I'm guessing there must be some sort of rubber bush on the prop/front diff that is worn.
Has anyone had this problem and fixed it? Tried searching on here but no joy.
Thanks
You ideally need the car on a ramp .. undertrays removed and a visual inspection .. you would check the suspension whilst looking .
There is a rubber doughnut but its at the back of the gearbox so behind the front seats and central .
The prop at the front is splined into the front diff .
Thanks for the replies. I've had a look at some pics of the front diff assembly and I see that there are 2 mounting bushes near the front of the car and one a single round bush which is located roughly where the sound seems to be coming from near the middle of the car
I'll get it up on a ramp and have a look.
Has anyone had to replace this single mount?
https://www.design911.co.uk/pages/diagramsBrowser.aspx?categoryID=3&diagramID=2853
Number 10 on the parts diagram that I've linked to above
Link doesn't work but i assume you mean no.10 on my image ..
If so no and i've never replaced the front diff mounts for a noise either ....
Anything is possible though ... might be a loose fixing :dont know:
I would lean towards a driveshaft though as already mentioned .
Yes, thats the one. Had a look underneath with the covers off. There is a little movement
I wonder if it could be the propshaft rubber coupling instead, I forgot to inspect it.
The noise is a metallic type of clonk as it takes up drive, definitely transmission related. I'll have a look at the driveshafts but the noise isnt from that area
The prop rubber doughnut is at the rear .. not sure you would get a noise at the front but it does need inspecting as these do split .
Driveshafts and they are in the right location .. its a case of trying to move them .. checking for play .. after that its a pry bar on just about everything looking for play .
The worst way .. what we call a chassis ear .. a microphone setup we attach to different points .. then a road test and a listen through headphones to try and locate the noise .. this can mean several attempts with x2 mechanics .. so this sort of thing ends up costing i'm afraid .
