Instaling new new style window regulator (Tech Bulletin #7)

[CARRERIC]

Just bought all new parts to replace my window regulator with the new style three arm, and new window channel. I have a 1975 911 coupe with power windows and old style two arm regulator.
NEW PARTS:
Part# 911 542 929 03 Window regulator
Part# 911 542 057 00 Channel

Has anybody done this before. And have you drilled the holes specified in tech bulletin #7.

have a few questions:

1.) are the hole cordinates in Bulletin #7 in inches or cm.? where were your startng points?
2.) to remove the bottom window channel did you take the window frame off to remove window, and then remove the channel? How hard was it to remove the channel and what was the best method.?

Overall was this a difficult job?

Thanks
Eric

[RoninLB]

Originally posted by CARRERIC

Has anybody done this before. And have you drilled the holes specified in tech bulletin #7.

1.) are the hole cordinates in Bulletin #7 in inches or cm.? where were your startng points?

2.) to remove the bottom window channel did you take the window frame off to remove window, and then remove the channel? How hard was it to remove the channel and what was the best method.?

Overall was this a difficult job?

yes yes

metric.. look at tech #7 again to begin alignment.

yes / yes / I use a die grinder to slice old channel

Don't rush the job. It's brainless.

I did this on my 77 Targa a few years ago. Mine has hand cranks, not electric lifts, but the procedure is about the same.
The measurements shown in Tech 7 are in mm. I don't recall starting with any one measurement, I just started marking them off, and it ended-up with only two spots that would match-up with all the measurements. The hardest part was getting the glass out of the old window channel and getting it into the new one. I pulled the window and channel completely out of the car for that. Lots of penetrating oil, soaking time and careful use of a thin putty knife finally got the old one off. Getting the new one on wasn't much fun either. I couldn't push hard enough to get it fully seated. Pushing with a lot of force on a piece of glass isn't any fun when you start thinking, "Gee, if this breaks right now, I'm going to need a lot of stitches!" I ended-up resting the glass on a piece of wood while gently tapping the channel on with a small hammer. Still a good chance of breaking, but at least it would only cost me $, not blood. There's a good article on doing this in Up-Fixin der Porsche, Volume 7, page 191. In the end, it's a vast improvement over the old style lift.

Good luck,
Ed Cavalier

[CARRERIC]

Thanks for the respones. I feel a bit more confident now.