915 nose replacement

[Pboden]

Have a -74 911 with the mechanical speedometer tranny nose which I need to change due to the damage threads on the speedometer connection. The replacement nose is in-house, so I just need to remove the the axl and gears from the old nose to the new.

They seems very tight, so any idea how to go forward ?

[Dpmulvan]

Heat

[Pboden]

Originally Posted by Dpmulvan

Heat

Heat is ok, but which part should I push where ?

[Dpmulvan]

[Mike O'Meara]

I believe the illustration is of a 901 trans speedo drive, O.P. is asking about a 915 nose, where the threads for the speedo cable are notorious for breaking.

[kevingross]

If your challenge is getting the "dog bone" out, yes, it can be difficult. The magnesium case just loves to galvanically corrode to different metals. There is a circlip retaining (7) the steel (old) or aluminum (new) button plug (9).



Remove the circlip, or more likely excavate what remains of it. Use some heat from the outside to warm the case around the plug, and tap the plug out with a long drift, working around its circumference to the extent possible. Install a new, uncorroded plug and o-ring. Last I checked, the alu versions of the plugs were available from Porsche: I have a few of them in stock.

I hope this helps. Patience and some overnight soaking with penetrant will help some.