1966 Evinrude 18hp Fastwin prop hub?

[durk187]

Have had this motor for a couple of years, reading a spec sheet for the first time a couple of days ago, I noticed that it stated that the 18hp has no shear pin. It states it has a rubber hub. <br /><br />Mine has a shear pin, why? Do I have a motor without this option? Is there a way to change it back to a rubber slip hub? <br /><br />I ask because I am often in less then optimum depth and break pins a lot. A rubber hub sure would be nice.<br /><br />DC

 

[rickdb1boat]

Re: 1966 Evinrude 18hp Fastwin prop hub?

Not sure of why the difference, but I would rather break a Shear Pin, Rather than spin a hub all the time. Easier on the Lower Unit, also!

 

[ob]

Re: 1966 Evinrude 18hp Fastwin prop hub?

duckcommander, My information shows from 1957-1973 18hp evinrude takes pin drive propellers.

 

[rickdb1boat]

Re: 1966 Evinrude 18hp Fastwin prop hub?

Hey OB,<br />Go to this Page and put on your Glasses(I Did!). Read the description of the 1966 Fastwin 18 HP. Says it has a Rubber Slip Clutch. "No Shear Pins, No Shear Pin Worries". Got me on this one!! <br /><br /> web page

 

[ob]

Re: 1966 Evinrude 18hp Fastwin prop hub?

Rick, from this laptop screen I think I need a Hubbel telescope.Only thing I can figure is that there is an optional aftermarket prop where they have done away with the hastles of shearing pins.Don't know whether shaft is tapered or just how it is retained without splines.Have read some other posts where guys have motors with both the rubber insert in prop and a shear pin.

 

[slow_boat]

Re: 1966 Evinrude 18hp Fastwin prop hub?

Hi,<br /><br />That engine came pin drive from factory, not sure as to whether a spline drive was available or not but, the pin drive prop has a rubber hub inside that CAN spin. The shearing strength of the pin is less than the spin stregth of the prop hub. Attn all engineers: Pls forgive my terminology

 

[durk187]

Re: 1966 Evinrude 18hp Fastwin prop hub?

Thanks for all the information guys. My prop does have the rubber insert. Still kind of weird though. I wonder why they claim no shear pins on that year if it came from the factory with them?

 

[Bear]

Re: 1966 Evinrude 18hp Fastwin prop hub?

The age of powerhead doesn't have to be the same as lower unit or as prop shaft and prop. I don't know if the fit from a long range of years but it is possible.

 

[BillP]

Re: 1966 Evinrude 18hp Fastwin prop hub?

Pre 65 models show a lower torque to check the hub...60-100 ftlbs vs. 100-160 ft lbs for 65 and later models. My manual shows a pin and calls it "drive pin" for 66. Same location as a shear pin though.

 

[Ed_Gusslesnapper]

Re: 1966 Evinrude 18hp Fastwin prop hub?

Hey there!
I had the same problem after I broke my drive shaft on a rock in the Wabash River. I wondered why my shear pin didn't break OR my hub didn't spin--I still don't have a good answer but I'm still looking for the driveshaft, anyone got one laying around,....?

 

[F_R]

Re: 1966 Evinrude 18hp Fastwin prop hub?

You are tacking your question onto a 6 year old thread. Nevertheless, your drive shaft was probably ready to break anyway and clipping the rock just finished it off. They break because the crankshaft (at the top end) is not aligned with the drive shaft bearings in the lower unit. That causes the shaft to have to bend back and forth with every revolution. They get out of alignment by bending the exhaust housing or gearcase casting.

This is not some new theory I cooked up. It is in the factory service manuals, along with instructions for checking the castings for being bent, using a surface plate and dial indicator. Just a few thousandths of an inch of bending will cause shaft breakage.

If you put a new shaft in your bent housing, it will break too. Might take a week, might take a year.