I have a '71 9 5 Sportwin that I recently sheared the prop pin off in the Wisconsin River. Luckily I had my trolling motor that got us up river and back to the boat ramp. It was slow going, but as you said, would've been difficult paddling upriver in a strong current. Plus, we were quite far from the ramp. I purchased extra pins for next time. Damaged the prop a bit, but those things run for $140. Nice work! Will definitely make a nut to keep on as an emergency fix.

Now you get to come back and go fishing in the river again 😁 Nice DIY!

@TheAfterWorkGarage

4 жыл бұрын

Thank you, and yes I definitely plan to. It is such a beautiful part of the country.

Same exact thing happened to my 62 evinrude 5.5 Great tip You're the man !

Nice easy repair. Like you're content, keep at it! 👍

@TheAfterWorkGarage

4 жыл бұрын

Thank you, glad to hear you like it!

Those prop nuts were indeed a design flaw. With a shear pin hub, there's always some outward bias against the prop/nut. Normally, that bias is cancelled out by the torque of the propeller against the water; but that's in forward. Reverse is where they're most vulnerable, especially when you go high throttle, with no momentum or while drifting forward. The spline drives don't have this problem. Quick tip: You don't need to drill a hole through a regular hex nut. That will usually work. But there are 2 possible issues with that: 1: It can be tricky to find the correct spot to drill the hole for both alignment as well as optimal tension against the propeller. And 2: If your hole has any larger burrs, those can damage the threads on the prop shaft. When I replaced the prop nut on my 6 hp, I simply bought a 1/2" castellated nut from an auto parts house for about $2. Plus a 20-cent flat washer from the local hardware store. Problem solved, and no drilling. I want to emphasize the importance of the flat washer, though: Those propellers are 2-piece, with the hub pressed into the shell from the factory. On the front of the propeller, there's an opening which exposes part of the hub, and that opening is approximately the same diameter as the outside reach of the bare hex nut. Without a flat washer to cover it, the propeller shell will slowly (and surely) vibrate itself further and further rearward, over the nut, until it eventually is separated from the hub, leaving you stranded again on open water. So yeah, don't forget to use a flat washer.

@TheAfterWorkGarage

3 жыл бұрын

Thanks for the information, that's really good to know.

I got one of theese engines, when going up to half throttle it goes fine, above that the rpm raises but wont go anywhere. I've read about prop hub spinning. Could this be the case on theese engines? Otherwise, what could it be?

@TheAfterWorkGarage

4 жыл бұрын

One other thing you might check to see if the engine is coming out of gear when more load is applied. This can be due to a bent or mis-adjusted shift linkage, or worn dog clutches in the lower unit. When the dog teeth that engage the drive gear become worn and no longer square, they have a tendency to slip out of gear when under higher loads. Hope this helps, and if you do figure out what's wrong, leave a comment as I'd be interested to know what the problem was.

@zlix_2045

4 жыл бұрын

@@TheAfterWorkGarage Any tips on how to check that? Just see if the gear lever jumps up?

@TheAfterWorkGarage

4 жыл бұрын

@@zlix_2045 That would be the easiest thing to see, though sometimes the "jump" out of gear can be relatively subtle, especially if the gear shift and linkage is loose, or has excessive play in it. If you don't seen anything obvious with the shifter, then I'd start by swapping out the prop with a known good one to rule out a prop hub issue. Then make sure the shift linkage is tight, and properly adjusted (in this motor there's a metal clamp with two bolts that clamp down on ball ends of the lower and upper shift rod, and they should seat all the way in there. It doesn't really adjust like other linkages I've seen). If none of that solves your problems, then you may be stuck opening up the lower unit and visually inspecting the shift mechanisms. Let us know what you find!

@wish2fish37

3 жыл бұрын

You can usually mark the hub and then run it and then check if mark moves on hub compared to prop. to confirm any hub issue.

@TheAfterWorkGarage

3 жыл бұрын

@@wish2fish37 Good point!

Good upgrade dude, ill have to check if mine still has the plastic junk holding the prop on.

Anyone know what the size of the nut is off hand? Internal and external?

Thanks for the tip. That is not actually a shear pin, it is a stainless drive pin. The prop's rubber hub is supposed to take the brunt of a hit.

@TheAfterWorkGarage

3 жыл бұрын

Thanks this is really good info. I just assumed that's what it was, though It did look a bit stout for a shear pin and it doesn't have the scoring that shear pins usually have. Thanks again!

@andrewrudlang2785

3 жыл бұрын

Hey I have one of these motors too, having an issue that it starts and runs nice but can't get any speed and can't get my 16 foot aluminum tin can boat to plane out even with two people. I have spark testers coming to triple check but based on looking at the plugs I think both cylinders are firing fine. Meanwhile I am trying to track down other possibilities. I haven't pulled my prop off yet, looks the same as this one in the video from the outside. Are we certain this prop on these 9.5/10 HP motors has a hub that can be "spun?" I keep finding conflicting info, that "yes these props have hubs that can rot and spin" or "no, these only have the shear pin/direct drive and the hub cannot get spun" etc. Obviously I just have to take mine off and investigate closer, but also looking for any input or advice. Mine is a 10022 model (1961?), I just found and ordered an owner's manual off ebay to hopefully help me learn more about it as well (I have much to learn about being a boat owner and operator of this antique motor). Definitely going to do the prop nut mod as shown here as my original plastic one looks pretty tired, thanks for the tip!

@tigerflyoutdoors7315

3 жыл бұрын

@@andrewrudlang2785 you aren't gonna get a 9.5 to plane a 16 ft boat. Just not enough power. Really need at least a 20. Yes, these 9.5's have rubber hubs and also drive pins. Not sure about the 10 HP. I have two 9.5 props in my garage with spun hubs.

Have one of plastic nuts that the threads are about shot in it. Cotter pin should keep it on unless it shatters apart. Did you put any anti seize on the threads. That washer and nut will rust.

@TheAfterWorkGarage

3 жыл бұрын

Good question. Ideally I'd use a brass or galvanized nut, and I've never used ant-seize on any of my prop nuts, but if you're really concerned it probably wouldn't hurt.The zinc on a galvanized nut works like an anode on the motor, and it won't last forever, but hey they're cheap and common. I don't run this motor very often, and the rest of the time it lives inside in the garage, so I wasn't terribly concerned about the metal, though if it starts showing rust I'll replace it.

would be interesting to know the exact size nut....I´m in metric country... Thank You.

@TheAfterWorkGarage

Жыл бұрын

Since this shaft was made before Evinrude started using metric fasteners, the size of the shaft is the 1/2inch 20 threads per inch. So you'd have to get the imperial size nut to match.

@nunomascarenhasribeiro

Жыл бұрын

@@TheAfterWorkGarage thank You

Hey, nice tutorial! i have a 25hp sportster evinrude 69', but i cant find a fitting prop nut. Do you know what kind of thread i have to search for? Or where to get it? I live in europe and i guess i need american standard... thanks in advance!

@TheAfterWorkGarage

3 жыл бұрын

Hi Bennit, I can't say for sure what the prop nut size for the 25hp sportster is, and I'm certainly not an Evinrude expert, but my guess is it's going to be a US standard size such as 1/2" (like this motor), 9/16", 5/8", or 3/4". In general, standard threading comes in "fine" or "coarse," and I believe for these you're going to want "fine" threading which is 20 threads per inch. This can be a little tricky to find since most larger sizes like this have coarse threading, but I'm sure you can find it online. I'd just measure the diameter of the prop shaft and order a fine threaded standard nut and give it a try. Good luck!

@bennit7069

3 жыл бұрын

@@TheAfterWorkGarage Thanks man! I got some tools to measure and ordered some UNC Nuts. Hope they fit! Then im gonna drill it like you show in your video. :) Tanks a lot!

@TheAfterWorkGarage

3 жыл бұрын

@@bennit7069 Awesome, glad to hear it.