Alternative fixes for chain brake stalling engine?

[Shibby]

The chain brake is stalling the engine, with it off the chain does not spin and the saw idles normally. The clutch, drum, and needle bearing are new. It looks like the crank shaft is worn enough to let the drum twist/angle with the brake applied.

Most of the searches I've found say to replace the crank/buy a new saw. Are there alternative fixes I have not found such as aligning the brake spring to stop the drum from twisting, shimming the needle bearing, etc? Looking at all my options before anything else.

 

[Canadian farm boy]

Sounds like you might be missing a part like the clutch washer or perhaps you may just need a new clutch drum and bearing.
Crankshafts are pretty tough. The clutch drum and bearing are what typically wear out but there are always exceptions

 

[Shibby]

The clutch, drum, and needle bearing are new. The clutch washer is still on behind the clutch, and the drum has the washer under the C-clip. I can see some wear on the crank shaft, so that's why I'm asking for alternative fixes.

 

[Canadian farm boy]

What saw?

 

[Shibby]

MS241C

 

[Canadian farm boy]

I know some of the ms261 had a problem with the cranks wearing where the clutch drum bearing rides. I haven’t heard of it on a ms241 but I suppose it could happen.

 

[van462]

Have you removed the brake band to clean behind it? Sawdust can pile up and prevent it from fully opening.

 

[Shibby]

Have you removed the brake band to clean behind it? Sawdust can pile up and prevent it from fully opening.

The saw works with the brake off. It doesn't have a problem disengaging the brake. Only when the brake is purposefully engaged does it stall.

 

[stihl livin]

young Texan is that you? The engine should stall when the brake is engaged. @Woodpecker something seems fishy here

 

[Maintenance Chief]

I think they mean the saw" dies " when the brake is applied? Stalling might be the same as in vehicle reference .
In that case I would think its an idle adjustment problem and its being "over diagnosed ".

 

[Woodpecker]

young Texan is that you? The engine should stall when the brake is engaged. @Woodpecker something seems fishy here

@Shibby whats your location maybe it’s an elevation thing? dot dot dot

 

[Shibby]

Not sure I'm understanding the jokes...

Yes I mean the engine dies and stops running when the brake is on. Its also impossible to start with the brake on and you can feel the drag pulling it over. I doubt this is an idle issue, it's an mtronic carb.

 

[huskihl]

If the bearing and drum are new and correct, it almost has to be a bent crank

 

[Creaky limb tree care]

It's a problem Stihl had with the case hardening on the crankshaft, here in the UK it was a major problem!
Not much you can do, I've seen phosphor bronze bushing made for the clutch drum but nothing has resulted in a cure, I have changed lots of cranks!!!

 

[Maintenance Chief]

https://www.farmertec.com/Crankshaf...240-MS260-Chainsaw-1121-030-0405-p228942.html
Here you go 15$ .

 

[Shibby]

https://www.farmertec.com/Crankshaf...240-MS260-Chainsaw-1121-030-0405-p228942.html
Here you go 15$ .

Are all the stihl crankshafts the same? I thought some had different stroke lengths. If they are the same I might go this route and try a new crank "made" for a different saw.

It's definitely a worn crankshaft. Here are two of the same model saws. One is definitely worn, the other not so much.

 

[Maintenance Chief]

Are all the stihl crankshafts the same? I thought some had different stroke lengths. If they are the same I might go this route and try a new crank "made" for a different saw.

It's definitely a worn crankshaft. Here are two of the same model saws. One is definitely worn, the other not so much.

The internet is at your fingertips Sir. Plenty of information about these saws in here.

 

[Michael Rupley]

oooh that crank is ugly. Should have posted that first and saved a lot of guess work. Yikes

 

[Shibby]

oooh that crank is ugly. Should have posted that first and saved a lot of guess work. Yikes

I would have, just busy and didn't have time to take the side off until today.

 

[jacob j.]

I would have, just busy and didn't have time to take the side off until today.

You'll need a 241 crank - the 024/026 crank is not the same.

Here's the IPL -