924Board.org

Aowolf · Joined: 29 Oct 2008 Posts: 2 Location: Dayton Beach

Hey guys and gals, I have an automatic 1988 924s. (the later motor) A few weeks ago my brother was driving the car home from work when it began to rattle at low RPM. At higher RPM though, the engine is smooth as silk. I took it to my Porsche mechanic who told me that the "Flex Cupeling" was worn out.

I know that isn't the official part name so Ill do my best to translate his mechanic speak. Basically he said there are two arms in the bell-housing that do not normally come into direct contact when the transmission is spinning. He told me that a piece of rubber sits between the two arms, and that it was gone now so that the arms are banging against each other at low RPM but are held together by centrical force at higher RPM.

Unfortunately Porsche sells the replacement rubber part for over $1100. What my mechanic suggested was welding the two arms together, but cautioned that to open the housing I would have to drop ether the engine or transmission.

Basically I am trying to figure out if there is a cheaper solution to the problem to stop the rattling. Will welding the arms work and is it healthy for the car? Is it ok to leave the rattle or will it have a destructive effect on the transmission?
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88 924S Automatic

Paul · Posted: Sat Aug 01, 2009 4:53 am Post subject:

Welcome to the board.

The only way to fix a failed dampener is to replace it. Sorry.

If it is really the part causing the noise it will fail completely very soon.
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White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.

Mav666 · Joined: 16 May 2008 Posts: 47 Location: Newcastle, UK

I've now got the same problem with mine, I've read elsewhere that welding the arms together isn't a good option.
I can live with it for now, but I'd also like to know if this will eventually destroy the transmission?

Paul · Posted: Fri Nov 13, 2009 12:44 pm Post subject:

It's not likely to damage the tranny, but it won't last long once it starts vibrating. The next time you punch the throttle and it kicks down to a lower gear.....
_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.

ic932 · Joined: 11 Feb 2005 Posts: 1104 Location: UK

I've just got a 924S auto (low milage) with a large hole in the cambox (cambelt failure). I'm going to be breaking it for parts. if you need any parts give me a shout before it all goes on evilbay.