I broke my MS440 Crankshaft. Now What?

[SteveSr]

Stupid question... Just how bad is the existing crank? A photo would help. I just read a post where someone did a similar thing and just welded a new stub back on the crank. Is that a possibility?

 

[PV Hiker]

Or get a smaller size nut/washer and cut new threads on the shaft. Does not have to be metric to work.

 

[Fatherwheels]

Take your crank get it re threaded and a nut made to fit,
Or get it cut down and a sleeve pressed on with new threads and a new nut.

Why would you need a new crank.

 

[farmguywithasaw]

I did that to my ms 310. I drilled a hole in the end of the crank where it broke and put a stud in the hole and welded it. Work so far

 

[siouxindian]

Yep like you said HL supply sells a kit.

https://www.hlsproparts.com/ProductDetails.asp?ProductCode=H35044-DNS&CartID=1
Ya the impact was so dumb! I didn’t want to stuff rope into the cylinder and I got ahead of myself and zipped it right off.

It’s almost as if they make special wrenches capable of torquing nuts and bolts to precise torque settings. I even own a snap on one.

What’s the saying? Slow is smooth. Smooth is fast?

Alright. Lines. Crankshaft kit. Intake boot.

Oh! Oiler, that is the only part of a chainsaw I’ve never messed with. Given the rest of the saw is doing okay, I shouldn’t need to mess with that right?


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we have all, well proly most of us men that fix stuff broke things that we thought we were fixing. **** happens.

 

[Alphadelta]

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[Alphadelta]

Take your crank get it re threaded and a nut made to fit,
Or get it cut down and a sleeve pressed on with new threads and a new nut.

Why would you need a new crank.

Honestly because I am not sure I could find a place to do it. Where I live in machine shops are not super common and not sure what the cost difference would be between the time, effort and parts vs trying to find a shop to install one. With that said I appreciate the advice and had not thought of that. I will look around and see if maybe I can find a shop to help me. Thanks

 

[Alphadelta]

I did that to my ms 310. I drilled a hole in the end of the crank where it broke and put a stud in the hole and welded it. Work so far

I like that idea but all have a suitcase stick welder, not sure the amperage gets low enough to weld that small of a piece. I will have to look into that!

 

[Alphadelta]

Or get a smaller size nut/washer and cut new threads on the shaft. Does not have to be metric to work.

Looking at it more closely, I don't think there is any metal left to thread. If anything I would have to use a much larger die and I don't think I would get more than 3-4 threads before I hit up against the beginning of the taper.

 

[Alphadelta]

Stupid question... Just how bad is the existing crank? A photo would help. I just read a post where someone did a similar thing and just welded a new stub back on the crank. Is that a possibility?

Posted a picture. To me it looks like a lost cause unless I go the drill and tap for a stud method.

 

[farmguywithasaw]

Posted a picture. To me it looks like a lost cause unless I go the drill and tap for a stud method.

I did tap mine or tried too it didn’t want to go. the hole was to get the stud straight. Crank is fairly hard so I don’t know how well it will tap. Could brake a tap in the hole that would be bad

 

[Alphadelta]

So I went ahead and bought, new crankshaft with seals, and bearings, fuel line, impulse line, and just in case a new cylinder kit from Meteor, also snagged a dual port muffler.
It should get here next week sometime.
But just for kicks and giggles I am going to try and tap it and put a bolt in tomorrow.