How to count splines

[1973Chieftain]

I just bought a '67 Mercury 500 engine, and for that engine all of the prop selling websites list it as a 11 tooth spline. Now I'm a noob to engines, but I pulled the prop off and counted the lands and groves on the shaft and come up with 15 of each. Does this mean its a 15 tooth spline? Or am I all wet in my methods? Thanks for the advice!

 

[etracer68]

Re: How to count splines

There should be equal amount of groves and lands , as you called them, yes, if there are 15, then its a 15 spline. I hope the prop you took off has them same number.

 

[1973Chieftain]

Re: How to count splines

There should be equal amount of groves and lands , as you called them, yes, if there are 15, then its a 15 spline. I hope the prop you took off has them same number.

Thanks! Yes, the prop has the same number. Im not sure how old it is, but I guess this engine has a different shaft then the normal one.. oh well, it runs! Thanks for the help!