67 Johnson 6HP flywheel removal

[67Johnson6HP]

This flywheel does not have any holes to bolt on a harmonic balancer puller. The only holes are not threaded and they are around the perimeter of the flywheel in no particular order. I tried to resize a pic to d/l but I can't get the f***ing thing to work. If necessary I'll try again but my nerves can't handle any more of that s**t today! I appreciate any help.

 

[tashasdaddy]

Re: 67 Johnson 6HP flywheel removal

you have a private message.

 

[jay_merrill]

Re: 67 Johnson 6HP flywheel removal

I have never seen a OMC 6hp w/o the correct mounting points for a harmonic puller. Once you figure out how to post a pic, please do so.

 

[samo_ott]

Re: 67 Johnson 6HP flywheel removal

I dont know the 6 but was thinking the same thing.

 

[tashasdaddy]

Re: 67 Johnson 6HP flywheel removal

here's his pic.

 

[Chinewalker]

Re: 67 Johnson 6HP flywheel removal

Remove the flywheel nut, then the SST cover. The threaded holes are underneath...
- Scott

 

[ezeke]

Re: 67 Johnson 6HP flywheel removal

You have to take the little cover off to get to the bolt holes.

 

[67Johnson6HP]

Re: 67 Johnson 6HP flywheel removal

Well duh.... Thanks. It obviously didn't occur to me they would be there - expected a larger pattern. Thanks again!

 

[tashasdaddy]

Re: 67 Johnson 6HP flywheel removal

besure to retorque the nut. or it will shear the key.

 

[jay_merrill]

Re: 67 Johnson 6HP flywheel removal

LOL - now I'm embarrassed ... I forgot all about the cover!

 

[67Johnson6HP]

Re: 67 Johnson 6HP flywheel removal

Got the 8 grade bolts and went to work. Impact gun worked great getting the flywheel nut off but has not broken the flywheel loose - yet. Have PB Blaster soaking for now. I know some some of you guys have a trick
(or two) for holding the flywheel while loosening or tightening the flywheel nut - like when torqueing down the flywheel? Appreciate your input. P.S. I remember "someone" mentioning "they had some tricks".

 

[jay_merrill]

Re: 67 Johnson 6HP flywheel removal

You will need a strap wrench to put around the flywheel in order to hold it while you torque the flywheel nut. Don't put the motor in gear and try to hold the entire drivetrain in place via the prop. This puts unacceptable levels of stress on the drivetrain and can cause problems. For motors that make use of a rubber bushing in the prop hub to absorb shock, its also a good way to damage that bushing.

 

[captk]

Re: 67 Johnson 6HP flywheel removal

use a strap wrench on the flywheel. pull hard. then pull harder. if that does not get it hit the end of the bolt on the puller with a hammer. should pop loose

 

[jbjennings]

Re: 67 Johnson 6HP flywheel removal

I had a 25hp flywheel that was TOUGH to get off yesterday. I put all the torque I could on the puller bolt with a small ratchet. Then used a little PB blaster on the bolt. NO GO. THen tapped the flywheel with a rubber hammer. NO GO. Then pulled out my ace in the hole last bullet longshot. I took my mapp gas torch and heated the flywheel around the center bolt to get it good and warm (not hot as that may warp it/ruin the magnet) while the pressure from the puller was on it. NO GO. Then a slight tap with the rubber hammer and POP, she was off. Be careful about hitting the bolt too hard as it could damage your crankshaft. A slight rap is good enough. If that won't do then it probably wouldn't work anyway.
Just some ideas in case it's tough.
JBJ

 

[67Johnson6HP]

Re: 67 Johnson 6HP flywheel removal

Yes it's a tough one. I was hoping it would not be since a mechanic had it off 'bout 12 years ago to adjust the points. I thought the impact wrench would be enough vibration to break it loose, but not yet. Working all day today and tomorrow so I'll let it soak 'til Monday. Thanks for all your ideas although I've probably read every thread here lately on flywheel removal. I want to replace the 40 yr old coils and condensers but it may be like someone posted here once - "Don't go there unless you absolutley have to".

 

[Evinrude Boater]

Re: 67 Johnson 6HP flywheel removal

I had quite the time getting the flywheel off my 1960 40hp. I tried the soaking, the heat, the hammer, cussin'. Nothing seemed to work so I just kept cranking on the puller. It popped off rather uneventfully after I had crushed the cone point on the puller bolt. I used grade 5 bolts too. I figured I would keep tightening until either a bolt breaks or the flywheel comes off. I have a parts motor and it was the same with it. I just knew to keep tightening the puller until it came off.

 

[ezeke]

Re: 67 Johnson 6HP flywheel removal

Despite frequent discussion to the contrary, my 1965 6HP has always had the flywheel removed by striking the balancer center screw firmly with a light maul. Just make sure that the motor is suspended on its transom mount and not sitting on the skeg. When the flywheel lets go it will pop loose, so be careful.

When you are done, you will want to thoroughly remove any oil.

Personally, I think heating a flywheel is a really bad idea. See the question about
"Will my magnets demagnetize if I heat them?" here:

http://www.rare-earth-magnets.com/magnet_university/magnets_FAQ.htm

Also, see item 12 in the following thread: http://forums.iboats.com/showthread.php?t=232517&highlight=Woodruff+Key

 

[jay_merrill]

Re: 67 Johnson 6HP flywheel removal

I'm ok with heating the flywheel but just not much.

 

[Evinrude Boater]

Re: 67 Johnson 6HP flywheel removal

I'm ok with heating the flywheel but just not much.

I agree. The flywheel is going to heat up when the motor is running. It doesn't take much of a temperature differential to cause some slight expansion. Don't be taking a torch to it. Maybe an electric heat gun.

 

[jay_merrill]

Re: 67 Johnson 6HP flywheel removal

Interesting article, Ezeke - thanks for posting it!