type911 transmission question

69911e · 05:58 PM

I am looking for help identifying a transmission I just purchased from a fellow PP member, pjv911. It is supposed to be a type 911 transmission from a 1970E. The numbers on the bottom of the transmission are 902/16, and it looks to be a mag case.
It does not look like the one in my car, which came from a 1970T, which I believe to be a type911. I thought the 911 was a pull style throwout bearing He states
"the 70-71 also use a push clutch release. Its just different than
the earlier type. Starting in 72` with the type 915 they have an actual pull type clutch release. Many people often wrongly refer to the type 911 as a pull when in fact it just has a different cable routing from the other side. "

Can anyone clear up which transmission I just bought.

Thanks

JWest · 06:41 PM

What you have pictured is a '69 901 trans with push style throwout bearing. It is a '69 because it is a mag case and uses the push clutch - the only year for that combination.

The type 911 transmission does use a pull style clutch.

Check out Grady's post in this thread for all the info you could want on '70 and '71 clutches.

Zeke · 03-05-2006, 06:59 PM

pjv911, or Kurt Williams is a long time Porsche repair guy. I'll be on what he says. There was a belhousing enlargement beginning in 71 that let the 911 use the larger flywheel, IIRC. 911 trannys are one of the better choices for coverting 914's into big bore motors for the same reason, but that they had the right setup for the clutch cable.

Ask Kurt how to intall it. I'm sure he will take it back if he was wrong, but methinks he knows how to do it.

rw7810 · rw7810's Garage

James - It may be a 69 mag case, but the orintation of the fork end says it clearly is a "pull" type operation. My understanding is the 70-71 is the only time they built the "push" type. The "push" was a very poor design by the way.

JWest · 03-06-2006, 07:35 AM

Quote:

Originally posted by rw7810
James - It may be a 69 mag case, but the orintation of the fork end says it clearly is a "pull" type operation. My understanding is the 70-71 is the only time they built the "push" type. The "push" was a very poor design by the way.

You have the (commonly accepted) nomenclature backwards. The "push" and "pull" is in relation to the pressure plate, not the cable connection to the throwout arm (these are opposites).

The '69 and older is a push type (the pressure plate is pushed in for release) and the pull type is used on the 911 and the full run of 915 transmissions (the throwout bearing is attached to the pressure plate and is pulled away from the engine for release).

Zeke · 03-06-2006, 06:01 PM

I may have stated in error about the bellhousing. I thought that's what I heard Wayne say once. (He has a 914 with a 3.2, I believe.) I shouldn't try to be a parrot. The main thing I wanted to emphasize is Kurt's integrity.

Anyway, did this get straightened out? Will the tranny work for you?

JWest · 03-06-2006, 06:21 PM

Quote:

Originally posted by Zeke
The main thing I wanted to emphasize is Kurt's integrity.

Anyway, did this get straightened out? Will the tranny work for you?

I agree about Kurt from what I know, and I just wanted to give the facts of what I saw in the pics. There may be some confusion based on the car and the perceived need, all I can tell is what you have pictured and what was original equipment in the years of interest.

TimT · 03-06-2006, 06:37 PM

That transmission is for a push type clutch...

On a pull type clutch the throw out bearing is usually attached to the pressure plate.

The pictured transmission has a clutch fork and throwout bearing that are from push type clutches.

rw7810 · rw7810's Garage

OK - I understand what James says about the push vs pull and don't disagree the explanation above makes sense, but on page 40 of the Stoddard catelog, it lists the 225 mm clutch disk for a 70-71 and describes it as "push" pn 911.116.011.07 This can be confusing, no??