Carpokes Porsche Forum

Decking the block after the flanged sleeves are installed.

Cruise98 wrote: Tue Jan 31, 2023 1:00 pm I think I found it on the PET for 911 78-83.

Part # 900.012.110.00 Straight pin, 10M x 14

It is used between the main and rear cases for the transmission.

Thanks Tom

I'm not entirely sure what size that one is? PET shows it as "10 M 6x14" -- so is that 10mm in diameter or 6? 14mm seems a bit long too. I'll see if I can yank one out and tell you the length. Depending on the price for those pins, you might be better off just getting a 10mm pin on amazon or whatever and cutting it to length. Chuck it up in a drill and run a file on it to round off the end....

They are $7/each. I had thought about getting a dowel and doing what you had suggested.

Ok, just pulled one out of my all-original '86 951 block.

As installed from the factory, it sticks out 5.8mm.

On my fancy Mitutoya calipers, the factory dowel measures 9.99mm in diameter and 19.2mm long tip-to-tip. So the factory pin sinks in 13.4mm deep by my math, and the hole it goes into is about 16mm deep at the deepest point.

For reference, I measured a 10mm drill bit and it measured 9.94mm. While the end of the drill bit fits ncicely in the hole, it was looser than the factory dowel pin, so tiny little differences do seem to count.

Still not sure what 10 M 6 x 14 means. It would be shorter than the original if it measures 10x14, but would probably work.

McMaster sells 10mm steel dowel pins in 18mm and 20mm lengths, with precision diameters for a nice tight fit. Pack of 5 is under $10 too....
https://www.mcmaster.com/91595a638/

Thanks Tom. I will order the McMaster pins. The part description is kind of funky.

You can order steel rods from any one of the online metal shops, then just cut to length. Way cheaper than a Porsche part!! Plus you can order 3' of the stuff and have a life time supply for you and your friends. I have used this for tons of the head and cam tower dowels (they love to disappear during any hear work!)

I ordered the pins from McMaster Carr and they are a perfect fit.

Also ordered some 10mm tool steel rod and it is loose. Good ole China quality control.

Cruise98 wrote: Fri Feb 03, 2023 1:44 pm I ordered the pins from McMaster Carr and they are a perfect fit.

Also ordered some 10mm tool steel rod and it is loose. Good ole China quality control.

Yeah, I bought a set of metric rods in stainless a while back, from Amazon, and had the same experience -- all were a bit shy of there nominal size. Even my "10mm" drill bit was less that 10 by a bit. McMaster listed size-tolerance specs, so figured they'd be our best bet. I assume you had to tap the McMaster ones in, gently, for a true friction fit?

The McMaster dowels slide in with hand pressure. Getting them back out was not so easy.
Thanks for the tip on McMaster. I have not surfed their site before, they have all kinds of good stuff.

Cruise98 wrote: Sun Feb 05, 2023 4:56 am The McMaster dowels slide in with hand pressure. Getting them back out was not so easy.
Thanks for the tip on McMaster. I have not surfed their site before, they have all kinds of good stuff.

I divide my life into two eras: pre-McMaster and post-McMaster. Their selection of hard-to-find hardware is simply unmatched, and the quality is never a mystery since they publish tolerance specs, detailed engineering drawings, and even CAD files for most parts. They actually beat Amazon shipping times to my house too. If I order by 5, I get most parts before lunch the next day...