Clutch alignment tool specs

jeff1hughes · jeff1hughes's Garage

Does anybody know the alignment tool specs (spline count, dia.)for the clutch in a 915? I have a friend with a repair garage and he has a lot of alignment tools, though as I'm sure you can figure, they don't come labeled for Porsches.

Tim Hancock · 04:20 PM

Jeff, I just measured the one made out of plastic to fit mine. You don't really need splines, as a properly sized round section fills the splined hole in the clutch disk just fine. Mine works perfectly (I typically make these every time I do a clutch job).

Anyhow, here are the dimensions of the one I made for when I replaced the clutch in my '79 SC. I made it on the lathe to fit, not to any exact pre-known dimensions (measurements taken after the fact). It lines things it up perfectly.

Hope this helps.

arrivederci · 02-28-2006, 05:08 PM

I bought one from a porsche shop about 7 years ago and it says "Ford 20" on it. See if he has one with those markings on it.

jeff1hughes · jeff1hughes's Garage

Ford 20 - perfect. I thought you needed the splines to actually make sure the disk and cover splines were lined up.

Tim Hancock · 03-01-2006, 03:25 AM

Quote:

Originally posted by jeff1hughes
Ford 20 - perfect. I thought you needed the splines to actually make sure the disk and cover splines were lined up.

Well over the last twenty years, I have replaced VW, Datsun, Chevelle, 944 Turbo and 911 SC clutches all using "homemade",
round (no splines) alignment tools without issue. The inside of the splines forms a "round" hole which when aligned with the pilot bearing by a concentric tool, positions the the clutch disk in the same spot as a splined shaft does.

If you feel better buying a tool or do not have the resources to make one, by all means buy or borrow one. I was just trying to help by providing a sketch of my simple tool.

However you do it, be sure to examine the throwout bearing and yoke, as often guys will not get the two properly meshed on their first attempt which will prevent mate up. (I suffered this first timer mistake myself) As you start the mate up, you have to manipulate the yoke into the throwout bearing or the two will not mate up. Most other cars, you just shove the two together, but 911's need to be meshed while being pushed together.

arrivederci · 03-01-2006, 04:23 AM

Quote:

Originally posted by Tim Hancock

If you feel better buying a tool or do not have the resources to make one, by all means buy or borrow one.

I wish I had the tools (lathe, etc) to make one. Even if I could make one, at less than $10 to buy, its a no brainer for me. In Jeff's case, he's borrowing one from a friend.