C Service Prop Shaft Diameter

[machinedcomp]

Resizing Service prop for a friend. What is the prop shaft diameter?
Thank you.

[Racerkyle20]

http://www.apba-racing.com/sites/all...%204-27-12.pdf

Here's the pro technical manual. But I don't see anything in there for the prop shaft. Only found that lower unit must be "stock." Whatever that is....

[Tim Weber]

What size is a service C propshaft? That is a loaded question.

You really need his lower unit. The shaft in most of these vary a little as they are worn and pitted etc.

What I have done is take a Dremel tool and very carefully grind a little material off the inside of the hole. Also, clean the prop shaft with some 220 grit paper.

Tim

[david bryan]

What size is a service C propshaft? That is a loaded question.

You really need his lower unit. The shaft in most of these vary a little as they are worn and pitted etc.

What I have done is take a Dremel tool and very carefully grind a little material off the inside of the hole. Also, clean the prop shaft with some 220 grit paper.

Tim

i have bin making the c service prop shaft hole .782 thousand

[EKorpe]

Prop shaft dia

Steve Greaves #206-371-0486

[bh/]

Nominal 3/4" for the original SpeediTwin l/u. Aftermarket l/u's may vary.

[machinedcomp]

Thank you for all the replies. The prop currently measures .782 Dia. with a Pin guage.
So 25/32 must be the nominal shaft size. I'll just open it up another .005