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MS460 crank question

drf256

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So... Is it ok to use those 046 cranks?
Obviously it spun a bit in the inner race.
The big end is smooth and tight. Shame I need to toss it.
View attachment 356168
I don’t want to give you wrong info.

At least in the saws I’ve done they held up. There was a slight interference fit, but nothing like the other Stihl models.

I realized it when a saw came back with a bad flywheel side SKF bearing. The PTO side fit was loose. I figured that must have caused the fly side failure (cause nothing else was wrong). I started going through my cases to get a “good” crank and after I pulled 3-4 of them and tried various OEM PTO bearings I realized the issue. The same OEM 6202 PTO bearings were not slip fit on any other crank from 026-044.

I tried to stipple one with proper V block support. The material is so tough that it was not possible for me.
 
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drf256

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So... Is it ok to use those 046 cranks?
Obviously it spun a bit in the inner race.
The big end is smooth and tight. Shame I need to toss it.
View attachment 356168
If you mic the entire PTO side shaft is it the same diameter? IIRC it was for me. The dark area (we are assuming is spun) was the same as the rest of the shaft. If I find one in my pile I’ll see if I can try to check again.

It makes no sense that the slip fit is because the crank is spun. If that were the case, the bearing would fit tight on the outer portion of the shaft and get loose when it got near the lobe. The outer part of the shaft before the clutch threads has no way of being worn down. The spider gear spins on that part, and there is no way that brass is wearing that crank down.

Think about it, has to be a design flaw. There’s no way that the entire OD of that shaft is slip fit if only the inner portion got spun. It seems like it wouldn’t be very detrimental, at least to me. I don’t like it though.
 
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lehman live edge slab

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If you mic the entire PTO side shaft is it the same diameter? IIRC it was for me. The dark area (we are assuming is spun) was the same as the rest of the shaft. If I find one in my pile I’ll see if I can try to check again.

It makes no sense that the slip fit is because the crank is spun. If that were the case, the bearing would fit tight on the outer portion of the shaft and get loose when it got near the lobe. The outer part of the shaft before the clutch threads has no way of being worn down. The spider gear spins on that part, and there is no way that brass is wearing that crank down.

Think about it, has to be a design flaw. There’s no way that the entire OD of that shaft is slip fit if only the inner portion got spun. It seems like it wouldn’t be very detrimental, at least to me. I don’t like it though.
I’d have to agree with the crank just being slightly undersized from the factory but strange thing is nobody noticed or cared to change it after all those years.
 

qurotro

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If you mic the entire PTO side shaft is it the same diameter? IIRC it was for me. The dark area (we are assuming is spun) was the same as the rest of the shaft. If I find one in my pile I’ll see if I can try to check again.

It makes no sense that the slip fit is because the crank is spun. If that were the case, the bearing would fit tight on the outer portion of the shaft and get loose when it got near the lobe. The outer part of the shaft before the clutch threads has no way of being worn down. The spider gear spins on that part, and there is no way that brass is wearing that crank down.

Think about it, has to be a design flaw. There’s no way that the entire OD of that shaft is slip fit if only the inner portion got spun. It seems like it wouldn’t be very detrimental, at least to me. I don’t like it though.
Wow. That's a good thinking. I need to investigate it again. BUT! The 372 crank looks like the whole shaft is the same dia, but actually it is NOT. Same story. Actually the spot where the inner race sits IS a hair bigger by my finger feeling, I can feel a hair of step, but not visually.
 

drf256

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Nothing about it makes much sense.

Stihl used a spacer on the 044 to get the correct diameter for the worm gear. On the 046, they kept the OD of the crank the regular size of other models and it uses the same PTO seal as the 026-036 (been a while but I’m fairly certain). They accomplished utilizing the same 1128 worm gear by using the C clip for it to ride on with the 046 crank.

Strange stuff.
 

Funky sawman

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I've only rebuilt a couple 046 stihls, they were for sure interference fit on both sides of the crank. I've ran a lot of 046 and 460's cutting timber over the years, and they have always been super durable and reliable as the sun coming up. I did end up with a bad batch of bearings nsk brand I think, the whole package of ten 6203 c3 fit loose on 3 different 2100 husky cranks
 
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