Crank Interchange

[DSPTurtle]

Anyone know why the 3.2 and 3.3 turbo cranks have different part numbers? They appear to be the same. Are they oiled differently? Different forging process? Inquiring minds wanna know

[JJ 911SC]

Crankshaft or the case?

Crankshaft seem to have the same #: Porsche 911 (1974-1989) - Main Engine Components - Page 1

[Flat6pac]

Different distributor drives.
Bruce

[DSPTurtle]

Thanks Bruce.

[BURN-BROS]

I don't think the crank drive and timing gear comes with a new crank...

I would think it's the pin to locate the DME flywheel.

[KTL]

Is the pin to locate the flywheel even necessary? The crank & the flywheel are hubcentric by the relief in the back of the flywheel and the step on the crank flange. Plus the 9 bolt flywheel will only align in one single position. So you can't clock it wrong even if you tried.

Watch this silly video I made. If you follow the 6 o'clock bolt hole on the flywheel as I go around the crank, that flywheel hole makes a stop at the next available crank bolt hole as I go around the crank. All 9 bolt holes properly line up only at the start and finish of the video.

https://www.youtube.com/watch?v=n-KVrrR8Oyg&list=UUHJMEWT4gFl2ZdNW7zqeFaw

[BURN-BROS]

I guess Porsche wanted to ensure a more accurate crank angle than the bolts would have given.

[brp914]

ATDT. Am there, doing that. The turbo doesn't have the holes drilled for the pilot bearing. Get the holes drilled and tapped or weld the bearing to the flywheel. Actually, press the bearing out of the mount plate and weld the plate to the flywheel.

Get a carrera distributor drive gear and put it onto the crank if you're going to use motronic.

[Flat6pac]

1980 was the change year, the factory drilled the 3holes for the pilot bearing on all the cranks. 3.2 with the G50 has the drilled holes but doesn't use them. Turbos, after 79 used the 3 hole pilot.
Bruce