High or low profile OMC electric shift

vipertech

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Im trying to find replacement parts for my 1977 175hp outdrive and trying to figure out if I have a high or low profile. Im looking to replace the upper driveshaft as well as the lower trough the impeller pump as they are rusted and worn badly. Also if anyone on here has any recommendations on a who to get these trough that would be great.
 

Boomyal

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Re: High or low profile OMC electric shift

Here a picture of the two different profile housings. All the parts you want are probably available thru iboats.

 

vipertech

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Re: High or low profile OMC electric shift

Mine is definitely the one on the left. So I assume mine is a "low profile".Thank you very much for the picture
 

Boomyal

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Re: High or low profile OMC electric shift

Mine is definitely the one on the left. So I assume mine is a "low profile".Thank you very much for the picture

You are lucky. Having the Low Profile would let you upgrade to a full mechanical shift outdrive. They did not carry over the Hi Profile when they changed to the hydro-mechanical, then the full mechanical OD.
 

vipertech

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Re: High or low profile OMC electric shift

Do you have any info on what drives will work or any links to that info? I was wondering what if any would work withmy motor as I really like the 302
 

Boomyal

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Re: High or low profile OMC electric shift

Do you have any info on what drives will work or any links to that info? I was wondering what if any would work withmy motor as I really like the 302

You can use any drive from 1978 to 1985. Within those years there are two different versions. '78-'81 was the hydro-mechanical drive. That is the one I used when I dumped my electric shift back in late '79.

'82-'85 is the full mechanical shift. That would be the preferable drive to use today. For either one, you need the drive itself, the proper shift cable (very expensive if you have to get separately), the proper shift converter box and a new helm control with shift and throttle cables.

Either outdrive will bolt right up to your intermediate housing. The only thing you have to do (I think) is to enlarge the hole in the intermediate housing where your current shift wire goes through. I had a dealer convert '75 back in '79 because I repeatedly broke forward clutch springs and no one could figure out why.

My Hydro-mechanical drive has served me well. After over 30 years (a lot of hard use for 10 of those) I never had any malfunctions. In 2006, for general purposes, I had my drive gone thru. I had everything out of the boat to redo the floors. They replaced 2 worn splined shafts and resealed everything. At that time, I also replaced the Intermediate drive shaft and engine coupler with the latter, larger splined versions. The fine splines on my '75 IH shaft were getting pretty worn. It was said that the latter larger splined shafts would not wear like that.
 

southkogs

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Re: High or low profile OMC electric shift

Not to go against Boom, but as an alternative - if you're lower unit is working properly, I'd run it out (personal opinion). I think the electric shift for all of it's downfalls is a fantastic drive while it works. It shifts smooth and quickly, delivers nice easy and instant power for close in maneuvering.

If the lower is toast, then I completely agree - go to the newer drive. But if it's working, go with it, and buy the extra mechanical for when it truly croaks.

I think the impeller kits are available right here on iBoats.
 

Boomyal

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Re: High or low profile OMC electric shift

....Not to go against Boom,..... .

Wasn't really trying to talk him into. Just wanted to let him know in case he had good cause (like you say) I know there are a lot of 'lectric shifts out there that are still ticking a way. It just did not work out for me.
 

vipertech

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Re: High or low profile OMC electric shift

I want to thank you both as you guys answered questions I was going to ask. I have decided to go trough the upper unit and replace both drive shafts, ball gears and reseal. The lower still works and will keep up with it but be on the lookout for a replacement lower unit to build on the side. I can replace just the lower right?
 

southkogs

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Re: High or low profile OMC electric shift

Boomer can answer that better than I can, but I think you may need a different intermediate. I'm not sure what has to pass through there.
 

Boomyal

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Re: High or low profile OMC electric shift

........ I can replace just the lower right?.....

If you mean replace your entire electric shift leg with a later hydro-mechanical or full mechanical, the answer is yes. Either one will mate up with your electric shift intermediate housing. BUT, read my entire post above. Each of the drives have specific additional components to make them work. The shift cable is different for each drive and the converter box is different for each drive. You have to have the right pieces to match whichever drive you choose. They do not mix and match.

Your electric shift has neither a shift cable or a converter box.
 

vipertech

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Re: High or low profile OMC electric shift

Yup I understood your post about the box and or cables to operate the drive. I just wanted to know if the lower section will work with my upper or do I need to change the entire outdrive
 

Boomyal

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Re: High or low profile OMC electric shift

Yup I understood your post about the box and or cables to operate the drive. I just wanted to know if the lower section will work with my upper or do I need to change the entire outdrive

I do not know with a certainty but I think you need to change the whole drive. You could call Steve at Ryan's Marine in Portland Oregon. He will know for sure. I think the gears are probably similar but the later upper would have the provisions for routing the larger shift cable up through it then back out to go thru the IH.
 

southkogs

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Re: High or low profile OMC electric shift

...but the later upper would have the provisions for routing the larger shift cable up through it then back out to go thru the IH.
That's what I was thinkin' the hangup might be.
 

vipertech

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Re: High or low profile OMC electric shift

What type of grease should I use in between the upper and lower shafts as well as the zerk fittings on the outdrive? I was thinking of a anti seize but want to make sure it's going to hold up and last.
 

Boomyal

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Re: High or low profile OMC electric shift

What type of grease should I use in between the upper and lower shafts as well as the zerk fittings on the outdrive? I was thinking of a anti seize but want to make sure it's going to hold up and last.

Not sure what you mean by the upper and lower shafts. However, just about anything uses a marine grade of grease. You can get a tube of (for your grease gun) it at any NAPA. It is usually green in color. You want to use that on any bolts threads that you pull out of aluminum housings as well. Do not use anti-seize.
 

vipertech

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Re: High or low profile OMC electric shift

I was told to apply grease in between the upper drive shaft and water impeller pump shaft.
 

Boomyal

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Re: High or low profile OMC electric shift

I was told to apply grease in between the upper drive shaft and water impeller pump shaft.

Ok, yeah, absolutely. I did not realize that you had the drive separated. I think that my local OMC guru uses a blue grease, in a tub, that is a bit heavier than the typical aqua/green marine lube that you buy for your grease gun. You might try googling "OMC stringer drive assembly lube", or look for an OMC dealer/shop in your area. They are still out there.
 

southkogs

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Re: High or low profile OMC electric shift

I've been using the aqua/green marine stuff ... they stock it at the local auto parts joint.
 

Howard Sterndrive

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Re: High or low profile OMC electric shift

Castrol Pyroplex blue.
Smear some on the side of your outdrive. At the end of a season of boating, there will still be a blue smear.
 
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