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-   -   Engine drive plate hub mount position (https://www.onlycubcadets.net/forum/showthread.php?t=26735)

mike melillo 08-19-2013 03:19 PM

Engine drive plate hub mount position
 
Dose anyone know if the hub slot wears more slowly if mounted in a specific position with respect to TDC? There are 2 mounting position options and the thought crossed my mind.

I looked at the 149 manual and it doesn't specify either. In the years past I never really considered this, but it dose wear faster than I would like.

Mike

J-Mech 08-19-2013 03:30 PM

I have absolutely no idea what you are talking about. What hub? The one on the rear? I can't think of anything that can be bolted on two ways..... How about some more info. And maybe some pics. You mentioned a 149, so a K321 right?

Yosemite Sam 08-19-2013 05:00 PM

I'm not saying that it isn't possible, but in all these years, I have never heard of anyone mounting the adapter a certain way to make it wear slower.

It would be nice if it were true though.

mike melillo 08-19-2013 06:18 PM

Quote:

Originally Posted by Yosemite Sam (Post 211912)
I'm not saying that it isn't possible, but in all these years, I have never heard of anyone mounting the adapter a certain way to make it wear slower.

It would be nice if it were true though.

I kind of figurer that its a long shot, but the aluminum pulley is pinned to the flywheel, and the tapped holes within are cast in the same location on the few I have hanging around. With that and my thought that IH/Kohler didn't just guess at the place to cast those hole makes me wonder. Plus after combustion, and as the mix is compressed the loads on the crank change, and could be transferred into the hub affecting the wear pattern. I really don't know, but I thought it was worth considering.

Mike

Juicybusa 08-19-2013 10:47 PM

Dang Mike, I guess I'm not the only one that thinks like that ! Good question.

J-Mech 08-19-2013 11:26 PM

The hub is a circle guys. It doesn't matter. It would wear the same no matter what. It's like a flywheel and clutch. You can bolt it on 6 different ways, but the wear pattern would never change.

Juicybusa 08-19-2013 11:33 PM

Best I can tell your right about that but it doesn't keep me from over thinking the simplest things. Maybe I should see someone about that? LOL

Yosemite Sam 08-20-2013 03:28 AM

Quote:

Originally Posted by mike melillo (Post 211925)
I kind of figurer that its a long shot, but the aluminum pulley is pinned to the flywheel, and the tapped holes within are cast in the same location on the few I have hanging around. With that and my thought that IH/Kohler didn't just guess at the place to cast those hole makes me wonder. Plus after combustion, and as the mix is compressed the loads on the crank change, and could be transferred into the hub affecting the wear pattern. I really don't know, but I thought it was worth considering.

Mike

I don't disagree with what your theory, at some point there has got to be a difference. I was thinking more along the lines of a vibration factor.

However, I believe that the alignment of the engine in relation to the drive shaft along with maintaining a smooth running engine, is probably about the best friend you are going to find concerning the wear issue on the adapter, drive shaft and pin.

All in all, getting 40 or 50 years of service out of one of these little machines is still pretty impressive.

mike melillo 08-20-2013 09:30 AM

Quote:

Originally Posted by J-Mech (Post 211984)
The hub is a circle guys. It doesn't matter. It would wear the same no matter what. It's like a flywheel and clutch. You can bolt it on 6 different ways, but the wear pattern would never change.

J, Your right, the hub is a circle, but it has a slot in it. The slot changes the equation because it now has a fixed point of attachment rather than a rotating circle. Kind of like saying the main journal is round and it shouldn't wear at one point over another.

It very well may not make a difference but I think dismissing the theory would be ignorant.

Mike

J-Mech 08-20-2013 02:17 PM

Quote:

Originally Posted by mike melillo (Post 212038)
J, Your right, the hub is a circle, but it has a slot in it. The slot changes the equation because it now has a fixed point of attachment rather than a rotating circle. Kind of like saying the main journal is round and it shouldn't wear at one point over another.

It very well may not make a difference but I think dismissing the theory would be ignorant.

Mike

Main and rod journals have "side" load on them. The hub has "rotational" load only. It doesn't matter where the slot is in relation to TDC. If the top of the hub (12 o'clock) is TDC, and the slot is at 1 o'clock or 5, 6, 7, 11:45...... it doesn't matter. It is the same load. Crankshaft load transfers to the hub in varying speed and force yes, but it would wear the hub the same no matter where you bolt it in relation to TDC.


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