If I buy a prop that's the wrong rotation, can I just swap wires?

charliedaubitz · Mar 30, 2013

I bought a 1977 Webbcraft with a stringer I/O and a 351w. it has a ss prop on it and on the first trip to test it, it went forward, with the control in reverse, this is a electric shift pin drive, no splines prop. I have the work history on the boat and the I/O was removed 7 years ago and I don't think the boat has been to the lake since.

I just switched wires to the magnets and that fixed the problem. If someone put the wrong rotation prop on the boat, is there any difference in the gears for forward or reverse. thrust washers or whatever. What direction rotation is correct. it's a 981105 lower unit with a 172491 michigan prop that needs a new hub.

I marked it and it's slipping. Could I press the old hub out and use crazyglue on it and press it back in after cleaning. I took it to a prop shop and they can't get the correct durometer rubber hub for a ss prop because of it's age. in the meantime I bought a 14x16 off ebay. the prop shop has the hub for a aluminum prop if it needs it.

boobie · Mar 30, 2013

Re: If I buy a prop that's the wrong rotation, can I just swap wires?

If you run that unit in reverse to get forward you're going to tear it up. Get the correct prop. The prop is supposed to rotate clockwise when in fwd gear.

jerryjerry05 · Mar 31, 2013

Re: If I buy a prop that's the wrong rotation, can I just swap wires?

Post a pic of the prop?? It's possible that they crossed the wires before. Your prop hould look like these.

southkogs · Mar 31, 2013

Re: If I buy a prop that's the wrong rotation, can I just swap wires?

... yeah, I'm thinkin' yer' wires were crossed, and you're probably in good shape. Like Jerry said, let's see a photo.

bruceb58 · Mar 31, 2013

Re: If I buy a prop that's the wrong rotation, can I just swap wires?

I hope you are referring to the direction of the blades because those props don't work on an electric shift stringer.

charliedaubitz · Mar 31, 2013

Re: If I buy a prop that's the wrong rotation, can I just swap wires?

jerryjerry05 said:
View attachment 187181 View attachment 187182 View attachment 187183
Post a pic of the prop?? It's possible that they crossed the wires before. Your prop hould look like these.

Here's a picture of my prop and the tool I used to remove the hub. It was broke loose from the urathane on the center. I had no idea what a hub looked like till the prop shop person showed me one. It is just held by tension on the outer part of the molded rubber hub to the inner part of the prop housing. I thought there were splines in the rubber or something that held it other than a tight fit. The center pressed out easily, I pressed it back in with crazyglue puddled up around it so it kept it flooded while it pressed back in. It's just going to be a spare anyway now.

Howard Sterndrive · Mar 31, 2013

Re: If I buy a prop that's the wrong rotation, can I just swap wires?

OMC Boat Propellers, Outboard Marine - propco marine boat propellers

if you refit the SS prop, be really careful you don't make really fast directional shifts. Some say the mass of a steel prop can lead to broken clutch spring tangs.

bruceb58 · Mar 31, 2013

Re: If I buy a prop that's the wrong rotation, can I just swap wires?

charliedaubitz said:
Here's a picture of my prop and the tool I used to remove the hub. It was broke loose from the urathane on the center. I had no idea what a hub looked like till the prop shop person showed me one. It is just held by tension on the outer part of the molded rubber hub to the inner part of the prop housing. I thought there were splines in the rubber or something that held it other than a tight fit. The center pressed out easily, I pressed it back in with crazyglue puddled up around it so it kept it flooded while it pressed back in. I't just going to be a spare anyway now.

Its not even worth being a spare. You need a new hub pressed in.

charliedaubitz · Mar 31, 2013

Re: If I buy a prop that's the wrong rotation, can I just swap wires?

bruceb58 said:
Its not even worth being a spare. You need a new hub pressed in.

There are no "new hubs" for the pin drive OMC ss props. no longer made.
Crazyglue is 2500 psi shear strength. there is over 3 square inches at the contact area inside the bushing, lets just say only 2 sq inches is in contact, that's still 5000 lbs holding. If I'm out on the lake and the aluminum one goes out, I'm going to try this one.

"if you refit the SS prop, be really careful you don't make really fast directional shifts. Some say the mass of a steel prop can lead to broken clutch spring tangs."

thanks, I read that too, I have the idle speed at 400 for that "factoid". it is heavy.

charliedaubitz · Mar 31, 2013

Re: If I buy a prop that's the wrong rotation, can I just swap wires?

boobie said:
If you run that unit in reverse to get forward you're going to tear it up. Get the correct prop. The prop is supposed to rotate clockwise when in fwd gear.

I have the correct prop, the gears and clutch springs in forward and reverse look the same, the thrust load would be the same so what would it tear up if a left hand prop was used??

jerryjerry05 · Apr 1, 2013

Re: If I buy a prop that's the wrong rotation, can I just swap wires?

The reverse gear isin't made for prolonged use.The bearing carrier takes most of the load and it's not strong enough for prolonged use.
You'll probably have a hard time finding a left hand prop for that anyway.
Comeon Bruce,you know if you try hard enough you can make anything work,Mor on that later.

bruceb58 · Apr 1, 2013

Re: If I buy a prop that's the wrong rotation, can I just swap wires?

charliedaubitz said:
There are no "new hubs" for the pin drive OMC ss props. no longer made.

Call a good prop shop like Wilmington Propeller in California to see if they can repair it. As is, its not going to work.

bruceb58 · Apr 1, 2013

Re: If I buy a prop that's the wrong rotation, can I just swap wires?

You guys need to get off the reverse rotation thing. He has a right handed prop.

jerryjerry05 · Apr 1, 2013

Re: If I buy a prop that's the wrong rotation, can I just swap wires?

Read what he's asking??? More on that later.He's asking questions on changing his RH unit to a LH.

Howard Sterndrive · Apr 1, 2013

Re: If I buy a prop that's the wrong rotation, can I just swap wires?

but no one ever made a LH prop for that drive afaik.

bruceb58 · Apr 1, 2013

Re: If I buy a prop that's the wrong rotation, can I just swap wires?

jerryjerry05 said:
Read what he's asking??? More on that later.He's asking questions on changing his RH unit to a LH.

He's not asking this at all. And I agree with Howard that OMC never made a left handed version of this drive.

charliedaubitz · Apr 1, 2013

Re: If I buy a prop that's the wrong rotation, can I just swap wires?

just for reference, this url is the company HMS, they make prop hubs. after seeing their catalog, I think the prop shop guy was mistaken when he told me, "there is no hub for my ss prop" HMS says to use the same hub for stainless as the aluminum prop. a VS-24.

http://www.hmshubs.com/HMS%20Website%20Catalog%20Data%20Only.pdf

If I buy a prop that's the wrong rotation, can I just swap wires?

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