elbeee964

Are the threads on the pinion nut (highlighted red in the picture, below) ('72 through '86 915 tranny) right hand or left hard tread?
My research shows this to be a M24x1.5 nut; part number 915.302.282.00.

Mine's really, REALLY resisting coming off CCW as seen, below.
(Just want to make sure it's not a CW nut before I make an all out effort.)

Thanks ahead of time!

Peter Zimmermann

CCW... 250 Nm torque spec - very tight...

elbeee964

250 N-m =... 185 ft-lbs

(cripes!)

Said like Chief Brody in, Jaws: "We're gonna need a bigger (cheater bar)".

Thnks, Pete.


If anyone has words of task-easing advice to break this sucker free, I'm all ears!

Peter Zimmermann

Breaker bar + 4' length of galvanized pipe, or a really good impact wrench!

Yes - 185 lb/ft!

theiceman

250lb impact gun and a big **** compressor.

elbeee964

Impact gun?...
Are the gears up for that kind of teeth rattling?
That's some ugly Hammer-time.

Peter Zimmermann

Think about the trauma those gears go through every time that you drive the car...

elbeee964

...moi?

RShepHorse

I'm think I'm losing my appetite for tackling my 915 synchros myself....

Peter Zimmermann

It can certainly be done, but the job is all about tools, manuals, and knowing what to look for.

Having an experienced professional as a tutor is immensely helpful with transmissions - I had the incredible good fortune of attending a one-week Porsche school for manual transmission repair back in the '70s. It's absolutely amazing how much can be learned from a factory-trained expert, that may never be learned otherwise.

We have a distinct advantage today; the digital camera. Every step during disassembly can be photographed, and those pictures can be put to good use. Extreme care and cleanliness should be considered part of the job. You should have a good idea what's inside before you remove the unit from the car. It's not easy, but it can be done.

pjporsche

hey the nut will come of with a impact gun and a 36 mm socket. buy the way who built your trans before, it has a very nice fifth gear,very nice.... jpporsche

pjporsche

ps the nut will come off lefty loosie, if you dont have a air comp. take the side shift support cover off and put the trans into two gears at the same time, the trans will lock up and then you can use a socket and braker bar,then knock out the roll pin in the input shaft and remove 27mm nut atthe same time you have the trany locked up. why are you taking the trans apart?

Hobbsie

Youse guys are brutal! I remember someone breaking a crankshaft in a 356 using an air wrench to deal with the pulley bolt. The mass of the item the nut is attached to governs the wisdom of air tool use to loosen/tighten. There's a lot of bearings and stuff that get banged using an air wrench here. I'm biting my tongue writing this, going against your sage advise.