Help with prop selection Mercury Model 40 4hp!

[Dambo715]

I picked up this Mercury Model 40 4hp. At a garage sale a few years ago. I recently broke the prop. 3 blade and looks to be made of plastic.

I'm having issues finding the correct prop. I'm fairly new to outboards, and have never had to even remove a prop in the past. Can anyone help a guy out?

 

[jimmbo]

There was more than one version of the 40(4hp). One or Two cylinder? A model # would help.

 

[Dambo715]

9191359

2 cylinder

looks like the one that was on it was spinning counterclockwise.

 

[jimmbo]

Well, that Serial # shows a 1978

If it uses a drive pin
http://ww2.boatpropellers.iboats.co...rs/?chart=214&engine_id=852&cart_id=208068706

 

[Dambo715]

Thanks for the assistance.

if it isnt drive pin? I imagine that would be splined? How do I tell the difference once the old prop is off?

also the link stats a clockwise spin. Mine spins freely counterclockwise. Does that matter? I imagine it would.

again....thanks! I'm pretty new to outboards. Especially the lower end.

 

[Dambo715]

Well, that Serial # shows a 1978

If it uses a drive pin
http://ww2.boatpropellers.iboats.co...rs/?chart=214&engine_id=852&*******=208068706

Sorry if I sound like an idiot. Haha. I kind of am when it comes to this....

 

[jimmbo]

Can you upload a pic of it? Once the prop is removed you will be able see if the driveshaft is splined.

 

[Dambo715]

Can you upload a pic of it? Once the prop is removed you will be able see if the driveshaft is splined.

Removed it today. The shaft is splined.

Number on Prop: 48-70453A1 7 (no diameter or pitch stamping)

3 blade

Its looks to be made of plastic. (Light blue in color)

 

[RCO]

That number supercedes to 48-86903A1. Both numbers are NLA, but it gives you another part number to search for. Try eBay, or one of the outboard salvage yards.