1967 Evinrude 6hp drive shaft reinsertion problems

[jay_merrill]

Re: 1967 Evinrude 6hp drive shaft reinsertion problems

I have been debating to myself weather of not that upper pin actually does anything.

if you think about, the pin will force the Seal spring Washer to spin, along with the spring, lower seal, upper seal, Drive shaft to c'case washer & gasket. probably not good.

I dont think that the pin even goes up in there. I'll test my theory out in the morning.

Don't waste your time trying to figure out if it "goes up in there" - if the motor is reassembled properly, it does. You should also not waste your time wondering if the pin is necessary - it is. The point of the seal assembly, including the pin, is to keep water/moisture out of the powerhead. I have a frozen 6hp powerhead sitting in my shop right now - the victim of a missing seal assembly.

I just finished a water pump job on a 6hp of that vintage, the night before last. I've done a bunch of them and find the process to be pretty easy, if you do it correctly. The trick to lining the pin up with the slot in the upper end of the midsection, is to put the motor in gear and once the top of the drive shaft is in place, turn the prop (plug wires off and pulled away from he plugs, please!) so that the shaft turns clockwise, as viewed from the top. Do not turn counterclockwise even a little - if you do, the impeller blades will try to reverse or will reverse! Do this slowly, a bit at a time and try pushing the gear box up each time you stop. If you miss the slot, keep going clockwise, until you are properly lined up.

Like most repair jobs, this process is just a matter of learning the proper way to do things. Once you do, its not hard.



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[F_R]

Re: 1967 Evinrude 6hp drive shaft reinsertion problems

so, is this true on all the 6's? I know it is on my 74 model.

I'm pretty sure it is. There might be an exception on the very earliest ones, but I don't think so.

 

[cajuncook1]

Re: 1967 Evinrude 6hp drive shaft reinsertion problems

1. Pull the powerhead

2. Install the lower unit to the midsection.

3. Now stack the seal parts on the drive shaft. Yes, use a new 303355 gasket and 303347 o-ring on the seal assembly. You DON"T want any leakage there.

4. Now put the powerhead back on.

In the future, it is only necessary to rotate the flywheel till the pin lines up with the slot, then drop the lower unit down. The seal parts will be retained in place below the powerhead.

Will follow your instructions to the letter. Will update when completed. Might be a few days. Believe it or not it is snowing pretty good out here in Texas!!! The kids have a snow day because school is out. Hopefully Monday or Tuesday I will have a report.

Thanks everyone for the time and instructions!!!!

cajuncook1

 

[bktheking]

Re: 1967 Evinrude 6hp drive shaft reinsertion problems

Just wait till the military arrives to dig you out, we take shots at Torontonians for that little mishap a few years ago, here is Ottawa we laugh at snow!

 

[F_R]

Re: 1967 Evinrude 6hp drive shaft reinsertion problems

To sum this all up, the seal keeps water out of the crankcase. If water gets in there it will cause slow damage to the bearings and someday it will throw a rod. Trouble is, then somebody will look at it and proclaim that it was run on the wrong oil. So the real problem never gets widely known.

If you assemble it all correctly, the cup, spring, and carbon seal rotate. The plate does not rotate. Sealing takes place by the ground surface of the carbon rotating on the flat plate. The o-ring completes the job by sealing the whole assembly to the drive shaft.

If you do it CORRECTLY, you will use a new gasket on the plate, and you will glue the gasket to the plate. Friction of the gasket against the crankcase and being glued to the plate keeps the plate from rotating.

The last five 5.5 & 7.5hp motors I've worked on all had defective and/or incorrectly installed seals. One of them threw a rod, one was within one start-up of throwing it, and the others were all damaged. Guys, these fine old motors are all quickly being destroyed by people working on them and not doing it correctly.

 

[jay_merrill]

Re: 1967 Evinrude 6hp drive shaft reinsertion problems

F_R, question. Since the usual way to change an impeller on the 6hp motors doesn't involve pulling the powerhead, the gasket and o-ring can not be changed at that time. That said, how often would you advise pulling the powerhead to change them?

The same motor that I just did the impeller on, had the powerhead pulled a few months ago to fix something else. I didn't change the gasket and o-ring and, based upon your advice, am feeling like I probably should have.



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[BigB9000]

Re: 1967 Evinrude 6hp drive shaft reinsertion problems

I just ordered a new roll pin, O-ring and top most cork seal. I'll be redoing mine.

Q's

Should the 'gasket sealing compound' be used on the power head to mid section gasket?

What type of glue or sealant should be used on the cork seal?

 

[jay_merrill]

Re: 1967 Evinrude 6hp drive shaft reinsertion problems

Update:

I just got back from my area OMC/BRP dealer. While picking up a part, I asked the question about how often the gasket and o-ring should be changed. They said they don't replace them as a matter of routine, when changing a water pump impeller. Their procedure is to change the parts if there is a known problem, if they have the powerhead off for some reason, or if they have reason to believe that they have not been changed in a very long time.



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[cajuncook1]

Re: 1967 Evinrude 6hp drive shaft reinsertion problems

Update:

I just got back from my area OMC/BRP dealer. While picking up a part, I asked the question about how often the gasket and o-ring should be changed. They said they don't replace them as a matter of routine, when changing a water pump impeller. Their procedure is to change the parts if there is a known problem, if they have the powerhead off for some reason, or if they have reason to believe that they have not been changed in a very long time.



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Thanks for the update Jay Merrill!!! Very nice of you!! I have the powerhead off, so I'm going to follow FR's instructions, God knows when they were last changed and the parts are very inexpensive. The parts should be in Monday or Tuesday. I appreciate all input and its really nice that people take the time to explain and give good advice based on years of experience. I refer guys to this forum all the time!

cajuncook1

 

[jay_merrill]

Re: 1967 Evinrude 6hp drive shaft reinsertion problems

Following F_R's advice is always a good idea. He is one of the guys around here who will make me stop dead in my tracks, close my mouth and listen. Why? Because I know he did this for a living for a very long time.

What I find about working on outboards, is that there are procedures as laid out in the factory service manuals and there are procedures that come through experience. I was an aircraft mechanic many, many years ago and it was the same

I tend to listen to people around here with the "chops" that F_R has and I talk to the mechanics at my local OMC/BRP dealer a lot. I do this, because they have the years of everyday experience and can offer all the info and ideas that are not in "the books." The owner of the dealership that I go to, has been an authorized OMC mechanic for about 35 years and all of his guys have been at it for at least 20 years. They are a treasure trove of info and have been very kind to me, in terms of providing advice and guidance. Because of this, I've even been known to go into their store and buy something that I really don't even need all that badly, just to return the favor.

I think your plan to replace the o-ring and gasket is a good one and I am now wishing that I had done the same, when I had the powerhead off of mine!



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[F_R]

Re: 1967 Evinrude 6hp drive shaft reinsertion problems

When OMC designed the 6hp so you no longer had to remove the powerhead to get to the water pump, my personal opinion was that it was not such a good idea. I just have visions of messing that seal up while jabbing and poking at it with the drive shaft when reassembling. Of course the earlier models forced you to remove the powerhead, but that still doesn't force the guy doing it to realize the importance of the seal.

Oh well, what 'ya gonna do except keep preaching.

 

[jay_merrill]

Re: 1967 Evinrude 6hp drive shaft reinsertion problems

Just to give you a little something to look forward to - just got back from running mine. I put a new water pump kit in it, plus new points & condensors. This motor (I have 3 6hp Johnsons) is a '69 and has been run more hours than I could begin to guess at. I just had it out in the bayou and it ran flawlessly. It started on the second pull when cold (with choke) and first pull when warm.

OMC built some damn fine motors "back in the day!"



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[cajuncook1]

Re: 1967 Evinrude 6hp drive shaft reinsertion problems

Just replaced a new 303355 gasket and 303347 o-ring on the seal assembly. Replace the gasket from powerhead to exhaust housing. Everything went pretty smooth. Started up in the barrel and adjusted the slow idle needle and she purrrrrrrrrrrrrrrrrrrrrrsss!!!!!!

Thanks very much for all the excellent advice and walk through information. Supplied a picture! She not a thing of beauty, but she runs very nice and smooth. Will clean her up a bit more and later on repaint her and replace hood seal.



cajuncook1

 

[gdog98]

Re: 1967 Evinrude 6hp drive shaft reinsertion problems

trust us, you NEED that pin or the lower crank seal simply wont.
motor will idle nasty.
usually I shear that pin when trying to remove the gearcase.
but ALWAYS replace the pin if broken or missing before reinstalling the lower.
if you look at the spring cup you will note it has two indentions just for that roll pin.
reread some of the previous posts and it was explained how and why the seal works.

I just had that roll pin break on me and was wondering what size it's supposed to be - can't tell with it in pieces! Thanks for any help!

 

[Daviet]

Re: 1967 Evinrude 6hp drive shaft reinsertion problems

I don't have one to measure but i beleave the part number is 303261 for the roll pin.

 

[raczekp1]

Re: 1967 Evinrude 6hp drive shaft reinsertion problems

hi.
i had to make this pin in "homemade" way.diameter is 2.65 mm.
i used the roun end of drill bore ,becouse its easy to take exact dimenison. i cut the end of drill bore for aproporite lenght.


about this cork gasket.i wasnt sure what material is made from
i had to change this gasket, i used a pice of thick skin(about 2 mm) and cut it in round circle.
what do you think this skin is good solution?

 

[BigB9000]

Re: 1967 Evinrude 6hp drive shaft reinsertion problems

what do you think this skin is good solution?

Buying the right parts.

The seal is what, $2? o-ring $0.80, and roll-pin $1?

 

[gdog98]

Re: 1967 Evinrude 6hp drive shaft reinsertion problems

I don't have one to measure but i beleave the part number is 303261 for the roll pin.

Thanks Daviet! Originally I couldn't find the part#, but I did find it and got one ordered. $3.00 for that little pin but at least I know it's the right one! Thanks for your help.