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Dr. No's Avatar
 
Join Date: Jan 2004
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push or pull (clutch in VW-->911 transplant)

I'm confused.
I have a 1974 911 with a dead engine (bought it that way). I need it running, so am putting in a 2.0l vw engine, as discussed under a different heading. I have a spare '71 tranny from another project (that I had intended to use the 2.0 with anyway) and had understood that it would work with the VW flywheel, clutch and throwout bearing.
I don't understand which tranny is push, which is pull. The 915 I removed had a clutch cable, that pulls on the arm to pull the throwout away from the tranny. The 901 appears to have a fork that must be PUSHED to do the same thing, but the fork has only smooth tines, nothing to interact with the bearing. Where does the bearing go?

The 915 also had a kind of bellcrank thing on the left side, I have not figured out what it is for but it was not attached to anything. Is this a provision for a pushrod that was not in use? Is this car more messed up than I thought?

Thanks

Old 01-28-2004, 07:37 PM
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It would help if you identified the 901 'type number' and serial numbers stamped on the bottom of the transaxle ... if you expect any answers! The year and vehicle model that the VW engine came out of would be of some help, too.

You are mistaken about the direction the throwout bearing moves on a 915 transaxle, and the '71 transaxle, too, if it is indeed a type 911/xx! All clutches for 915 application have the throwout bearing pulled towards the transaxle.

If the 'cup-type' VW flywheel is to be used in a 901 transaxle, it will have to be 1969 model or earlier. The 1970 - '71 transaxles were type '911' and used the same type of 'pull' pressure plate assembly as 915s!

The bellcrank you mentioned is for the 911 engine throttle linkage!

The diagram below shows both types of pressure plates ... the 'pull-type' is on the right, and has the throwout bearing attached to the center of the spring. The throwout arm engages a slot in the bearing.

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1973 911S Targa ... 'Annie'
1968 340S Barracuda ... 'Rolling Thunder'
Old 01-28-2004, 08:17 PM
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Yeah, I do sound mixed up, don't I.

The engine is a GE case from a '79 bus (type 4) with a 215 flywheel and clutch.
The 911 transmission is not available for interview at the moment, but is a 70/71 model as in the picture below but it appears the ears have worn off the fork.
I also have a 914 transmission. It appears that the only (bell housing end) difference is the fork and pivot bolt. It this bolt can be switched (with the TO and fork), would it not convert the tranny to a "push-type"? Then the VW clutch etc would bolt up.

Old 01-28-2004, 09:21 PM
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