1963/1961 75hp Flywheel Compatibility

[yorab]

Hello. I have the motor in my signature and my parts motor is a 1961. The flywheels are different between the two motors, but not by much as far as I can tell. The 1961 flywheel is #580326 and my 1963 flywheel is #580398. The difference seems to be the height of the flywheel. One is a bit taller and the other is more squat and flat-topped. The stator is the same between the two years which tells me that either flywheel will work with the stator from either year. Also, the ring gear guard is the same so I don't expect any clearance issues between the model years. According to the parts manual, the rope pulley that attaches to the top of the flywheel on the 1961 is the same as the 1963 after a certain serial number in the production run.

I've mixed up the pulleys and flywheels and I'd like to know if I can combine them in any order without problems. Please let me know if you are familiar with this. Also, does anybody know why the flywheels are different? Thanks.

 

[Willyclay]

Re: 1963/1961 75hp Flywheel Compatibility

Pix??

EDIT: Looked and my parts bin and found a flywheel from a 1960 model but for magneto ignition so it definitely will not help answer your question. Also, I have a complete powerhead for a 1962 Johnson with battery ignition and alternator so it may be of some help. Looked online for parts catalogs but could not find one for your 1963 motor but from previous posts it looks like you have a hard copy and that is the source of your p/n's. Here's what I did find:

#580326 is the only flywheel listed for 1961 Evinrude Uni-Charger motors AND 1961 Johnson V4A/L-13-13C-13F motors which are also battery ignition with alternators. However, the Johnson catalog shows flywheel #580398 fits -13F only. This indicates to me there are some differences but I have no clue what they were.

Also, #580398 is the only flywheel listed for my 1962 Johnson V4AL-14.

Hope this helps but you may need F_R or Joe Reeves to get you the answers!

 

[yorab]

Re: 1963/1961 75hp Flywheel Compatibility

Thanks Willyclay. I had some time between the rain and snow (yes, it's still snowing here in PA) to go outside to compare the parts. I see that one flywheel is taller and the other is more squat though both have the same diameters. I also noticed that the flywheel pulleys are also different between the two motors. One pulley is #308358 and the other is #307933. I'm not sure which came from which motor. The only difference that I can determine is that the pulley's central hub (for lack of a better term) is deeper for the 308358. Therefore it fits the deeper profile of the taller flywheel. If I used the shallower pulley, then it would not have been deep enough to seat onto the bosses in the center of the flywheel that contain the threaded pulley bolt holes. I'll get a pic of each of the flywheels tomorrow and post back here for future reference.

I'm just curious of why this is. Could it be that one style of flywheel/pulley is used for the manual starter? Could it be that the later design increased the kinetic energy of the flywheel?

 

[Willyclay]

Re: 1963/1961 75hp Flywheel Compatibility

Could it be that the later design increased the kinetic energy of the flywheel?

Huh? What are your degrees in that would cause you to ask me a question like that? LOL, just pulling your chain a little!

I think the motor model number suffix "alpha character" identifies production changes and forum experts like F_R and Joe Reeves have all the "secret code books" needed to 'splain it to folks like me. I hope they are tuned in. Good luck!

 

[yorab]

Re: 1963/1961 75hp Flywheel Compatibility

So here's the pics of the two styles of flywheel. It seems like both will work as long as the proper rope pulley is used. The red is taller and the whitish one is more flat across the top. It doesn't matter much now, but I was just a bit curious as to why they are different.

 

[Willyclay]

Re: 1963/1961 75hp Flywheel Compatibility

i've been fooling with outboards since before your motor was built and have never seen the "flat-top" version. However, I have never worked a single day as a professional in the marine industry so that is not surprising to me. I learn new things every day on the internet and this forum specifically. The one thing I do know regarding the interchangeability of flywheels is the crankshaft taper & key are super critical AND must match the flywheel. The thought of a flywheel coming off at 5k RPM is pretty scary. Be safe!