OMC 5.5 and 7.5 Prop Nuts

[labrador-guy]

Any thoughts on these three D printed prop nuts?  The prop nuts for these small OMC motors are getting hard to find.  When you do find one they are bucobucks!  My son made these on his three D printer.  I drilled a hole through the thing for a cotter pin, that should hold it on.  Gonna try it!

dale

get’em wet…..don’t let’em set!

[Bob Wight]

Looks like a good substitute for the original – let us know how it works out!

Bob

1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1955 Johnson QD-16
1957 Evinrude Fastwin 18
1957 Evinrude 3022
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20
1982 Evinrude 25hp

“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."

[JACQUES]

Looks  pretty goood to me ! nice work !

 

Vintage outboard.com has them for $13.95  not to badly priced I guess but shipping adds up  and  shipping to Canada  means exchange rate etc… making it 30-40$

Joining AOMCI has priviledges 🙂

[RICHARD A. WHITE]

Member Ben Breitner has already done that….he has 3d printed many parts for these old kids…the cowl bumpers, face plate gaskets… just many many parts…

http://www.richardsoutboardtools.com
classicomctools@gmail.com

[JACQUES]

Cowl bumper wise  I have used the suggestion of one member whose name escapes  me at the moment…

common inexpensive automotive tire valves make perfect bumpers . Simply cut to size by removing the brass section.

They come in 2 sizes if I recall… just select the proper size

Joining AOMCI has priviledges 🙂

[Don]

Looks like a great solution.  Those rubber caps are a pain to install/remove without damaging them

[fisherman6]

labrador-guy wrote:

Any thoughts on these three D printed prop nuts?  The prop nuts for these small OMC motors are getting hard to find.  When you do find one they are bucobucks!  My son made these on his three D printer.  I drilled a hole through the thing for a cotter pin, that should hold it on.  Gonna try it!

dale

get’em wet…..don’t let’em set!

Hi Dale,  I can’t tell if the Cotter pin is offset to ride in the snap groove of the prop shaft or if it is centered and required a hole to be drilled.  I’m assuming it is off-centered so the Cotter pin is innthe groove.  That’s not a bad idea.  Mine are printed out of TPU and snap on like the originals. The do have a flat on the trailing end, though, allowing me to keep the detail of the snap feature without filling that cavity woth supports to print them.

-Ben

OldJohnnyRude on YouTube

[labrador-guy]

Hi Ben good to hear from you.  I just used the cotter pin hole that is in the propeller shaft.  The kid copied the original and I measured and drilled a hole to match.  The drill wanted to run a little crooked so I just made the hole a little bigger.  All the thing has to do is hold the shear pin in place.  I think it will work!   I should have checked with you first but, my son was up for an adventure so off we went.   I like to check the prop shaft for fishing line.  The rubber nuts are getting old and hard and not snapping on like they should.

dale

[DAVID]

how about tape on the shear pin in case the cap ever came off so you don’t lose the ipn and prop. ?

[fisherman6]

Yes, the snap caps are kind of a pain.  The TPU ones that I am printing work OK.  A Cotter pin would have been a better design from the start IMO.  So, you drilled a hole in the prop shaft for the Cotter pin from the new cap to fit through?

-Ben

OldJohnnyRude on YouTube

[Author]

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