915 Transmission Identification - Page 2

SuperNovaSS · 03-20-2018, 10:54 AM

Thanks. The flange is is about 3.98 inches which is 101.09 mm.

Jason

Matt Monson · 03-20-2018, 12:37 PM

Yep. It will be 100mm bolt center to bolt center.

SuperNovaSS · 03-20-2018, 12:45 PM

I can measure but I imagine it would be much less that 100 mm bolt center to bolt center.

Jason

Peter Zimmermann · 03-20-2018, 12:50 PM

Quote:

Originally Posted by SuperNovaSS

I can measure but I imagine it would be much less that 100 mm bolt center to bolt center.

Jason

That's OK, they won't be 108mm, which are the larger, more $$$, flanges used in '85/86 Carrera models.

SuperNovaSS · 03-20-2018, 01:08 PM

OK, that makes sense. I will pop the cover this week and report back, possibly even today. Out of curiousity, why do I need to pull both flanges to remove the cover?

Thanks,

Jason

Matt Monson · 03-20-2018, 01:17 PM

Quote:

Originally Posted by SuperNovaSS

OK, that makes sense. I will pop the cover this week and report back, possibly even today. Out of curiousity, why do I need to pull both flanges to remove the cover?

Thanks,

Jason

Because the other flange will be holding the differential into the case. You won’t be able to inspect the ring gear from the backside.

Matt Monson · 03-20-2018, 01:23 PM

Way more info than you need but starting a couple pages in there are good pictures and explanations about this gearbox.
http://forums.pelicanparts.com/porsche-911-technical-forum/975965-915-rebuild-itb-efi-project-here-we-go.html

SuperNovaSS · 03-20-2018, 03:33 PM

I was able to pull the differential today. The oil is clean and all looks well to me. Here are some pictures:

Thanks,

Jason

Jon B · 03-20-2018, 03:51 PM

Quote:

Originally Posted by SuperNovaSS

I was able to pull the differential today. The oil is clean and all looks well to me. Here are some pictures...

Jason, you need to wipe down the pinion and ring gear teeth, and look closely for signs of pitting, spalling or scuffing, similar to the pinion below.
It's a major expense to replace the ring & pinion if damaged or badly worn.

Peter Zimmermann · 04:00 PM

Did you turn the head of the pinion shaft in order to inspect all 8 teeth? A bit of aerosol cleaner will help you inspect, with all the oil it's hard to see some of the bits!

BTW; don't set the diff assembly on those carrier bearings! Always use one of the axle flanges and set the diff on it...

SuperNovaSS · 04:32 PM

I already reassembled the diff. Yes, I spun the pinion and there is no pitting or damage. I can break it down again in necessary. I have lots of experience looking at other transmission and transmission parts, just no Porsche specific parts. Point noted on the bearing surface.

Jason

Matt Monson · 03-20-2018, 05:31 PM

Prospective buyers will want to see for themselves. It’s worth your time to pull it back out and snap clean closeups. It’s the difference between a $1500 core for sale and a $2500 one.

Bob Kontak · Bob Kontak's Garage

Quote:

Originally Posted by Matt Monson

Prospective buyers will want to see for themselves. It’s worth your time to pull it back out and snap clean closeups. It’s the difference between a $1500 core for sale and a $2500 one.

Outstanding input.

Nice work, Supernova.

Wish all threads had an OP with SN's diligence.

FWIW and off topic, my 69 AMX 390 had a T-10.

Peter Zimmermann · 03-20-2018, 05:55 PM

Aw, crap. I was going to offer SS $800 and pay shipping, but...

Bob Kontak · Bob Kontak's Garage

Quote:

Originally Posted by Peter Zimmermann

Aw, crap. I was going to offer SS $800 and pay shipping, but...

You are the Grady Clay of transmissions.

I don't think this is the "Hans Herrmann oops Furhman" assembly you are looking for.

http://forums.pelicanparts.com/porsche-911-technical-forum/529135-what-kind-engine-do-i-have.html

SuperNovaSS · 03-20-2018, 06:46 PM

Thanks guys. I can’t thank you enough. When I’m asking all these questions, the least I can do is get back to you with the info you ask for. I will get some brake clean and pull the diff out again for some clearer pictures. As I said, I looked it over well but I’m sure I buyer will want to see for themselves.

Jason

Matt Monson · 03-20-2018, 08:15 PM

I want pictures of the Nova.

SuperNovaSS · 03-20-2018, 08:24 PM

It hasn’t seen the light of day for awhile. Kids have taken priority. Hopefully I can get it out of mothballs soon.

Jason

Matt Monson · 03-20-2018, 08:31 PM

Cool. Thanks for sharing.

Peter Zimmermann · 03-21-2018, 12:33 PM

Quote:

Originally Posted by SuperNovaSS

It hasn’t seen the light of day for awhile. Kids have taken priority. Hopefully I can get it out of mothballs soon.

Will you accept an offer for the early Bronco? Tell me what year it is, and if it runs...