orleyd

During a winter exercise session I noticed the front wheels were not spinning when the rears spun freely on the snowy road. Following the advise on a prior post, i jacked all four wheels off the floor, put the car in neutral and rotated a rear wheel. The fronts didn't move. Moving one front tire didn't move either rear or other front.

The prior owner had tires that were way out of spec and who knows what other abuse it may have been exposed to. I did have PPI done but this condition must have not been on their scope.

Does the engine have to come out to replace the coupler? Anyone had DIY experience? I found little help in the Porsche workshop manual (39-207).

Thanks for your response.

Dave

Geoffrey

You can remove just the trans and I may have a spare visous coupler around if you need one.

red993tt

That's a very kind of offer Geoffrey.

K24madness

Geoffrey,

My VC shows that it works but do they ever get weak before failure? I seem to spin the back tires only when really driving hard.

Geoffrey

I don't really know much about the AWD system and how it works. I only have a spare because it was removed it when I had my trans converted to 2wd.

K24madness

Geoffrey,

Thanks just thought I would ask.

I want to thank you once again for all of your help and unbiased wisdom over the last 2 years. Your input more than any other on this board has helped me achive the results I have. If there is anyway to repay the wisdom let me know.

I own a small business selling and servicing Canon photocopiers and faxes. If you ever have a need I will take care of you.

Tom

ca993twin

My method for testing the viscous coupler (very possibly invalid method) is to jack up ONE front tire and try to rotate it. If there is substantial resistance, then the viscous coupler is at least somewhat connected and working. Is this a valid test?

tar6day

My front+rear half shaft (4) CV joints (8) were shot and seemed to mimic what you are describing. I replaced the wheel bearings while I was there also. Everything works fine now. Worth a look!

K24madness

ca993twin,

My car passes that test. Yet I spin the tires violenty 1st,2nd & 3rd

Not sure what that means.

orleyd

Geoffrey,
Thank you for the offer. I will call you tomorrow.

Dave

pstoppani

I can spin the rears too. Doesn't the coupler transfer a max of about 45% torque to the fronts? If so, you could still spin the rears while the fronts are pulling too.

Right?

Woodster

K24,
I know what your spinning means...
A) you are a madman
b) you need smaller turbos
c) you need a GT950 kit
d) you need a supercharged mustang or a Viper

Happy New Year!

orleyd

CA993twin,
Following the test you suggested, lifting one front tire of the surface, it only takes 7.6 inch pounds of torque to turn the lifted wheel. That is not much more than overrcoming the drag from brake pads.

It seems that I have failed both tests.

BTW, this forum is awsome! I am truly grateful for the suppor of such a great group of informed folks.
Dave

ca993twin

I was hoping one of our "experts" would chime in and tell me if my method is valid or not. Dave, don't be discouraged just yet... it may not prove anything!

ScottMellor

On a wet/slick road, I just floor it in first and the car sits there with all 4 spinning and not going anywhere.