928 U.K.

Hello

i was wondering if anyone could please tell me how to check for play on the crankshaft on my 84 s2 so i can check out the thrust bearing as i have the auto tranny and the torque tube out and i am due to reinstall it would also need to know the tolerances on this model

many thanks

Tim 84 s2 auto

Rich9928p

Tim,

I haven't seen the procedure to check the crankshaft play, perhaps someone else can answer that question.

What I do know is that for MY 84 and earlier, there is a specific procedure for setting the proper tension on the crank when reinstalling the torque tube. If you don't follow the procedure you are risking thrust bearing failure.

The procedure is in the factory workshop manuals.

Rich

Steve J.

I made a small bracket to mount my dial indicator to one of the housing cover bolt holes, making sure it was perpendicular. With the pinch collar loose, I used a pry bar to move the crankshaft from one extreme to the other, prying on either side of the flywheel. There was an audible clunk and I could feel a solid stop. Maximum allowable wear was .016". Mine was .007" with 150K mi.

Earl Gillstrom

<a href="http://members.rennlist.com/v1uhoh/cranksha.htm" target="_blank">http://members.rennlist.com/v1uhoh/cranksha.htm</a>

Nicole

Can the flex plate be accessed without removing any exhaust parts? In other words: Is the cover the only thing that needs to be removed in order to check this out?

jpitman

Nicole,
From what I have read on the list, if you have cats, you need to drop them some to get the cover out. No cats (as in my Euro), cover comes out easily, everything is accessible to check end float.
jp

Earl Gillstrom

Nicole,

US S4s with cats, you need to drop the exhaust. You can get the cover off without removing the O2 sensor, just prop it up so it dosen't hang on the O2 wires. I have done it on a '85 USA car with cats without removing the exhaust.

While you are in there, do the "Loctite fix".
See <a href="http://www.nichols.nu/tips.htm" target="_blank">http://www.nichols.nu/tips.htm</a> Automatic transmission/serious engine damage.

Tony

One advantage of not having cats.

928 U.K.

thanks very much for all your help i am going to check for thrust bearing failure this weekend and i will post the results (hopefully good news)

can i assume that the spec is 0.0024 - 0.0076
with a .016 max wear limit for my 84 s2 auto

thanks again

Tim 84 s2 auto

Nicole

Thanks, guys!

I will not do this myself, was just curious as to what is involved in doing this.

928 U.K.

hi

checked my flywheel movement and it moved .25mm i checked it with a dial indicator on a magnetic base manuals say .1mm to .3 mm with a max of .4 mm so i am pleased to be within limits

hopefull i will start putting the 928 back togeather this weekend

thanks again

Tim 84 s2 auto