I thought Sthil made a good saw?

[Fuddy1952]

I just cut a fairly good sized dying white pine down, was limbing it when the muffler fell off my MS291. Can't figure out why. Soon as I got it in garage it's raining like crazy, so had to quit anyway.
Getting the one bolt recessed will be fun. Any ideas...thanks in advance.

 

[RalphVa]

The 12 inch battery one we have is a guzzler for oil. Wife mentioned this to some tree people recently. They agree: oil guzzlers.

 

[mrmikey]

Way I see it you have two options.
1: If you feel confident/lucky, drill and use an easy out, if you decide to go that route, heat up the boss around the broken stud once you get the easy out in before trying to turn it out. or
2: Build up the stud a bit until you can weld a washer then a nut to it and turn it out, working it back and forth gently. Which ever method you choose be sure to stuff a wet rag in the port. Watch your grounds as well, magnesium is bad for arcing under a loose or corroded ground clamp. Best bet would be to screw a bolt into the good boss, snug it up and use that to clamp your ground to...........Mike

 

[Fuddy1952]

Way I see it you have two options.
1: If you feel confident/lucky, drill and use an easy out, if you decide to go that route, heat up the boss around the broken stud once you get the easy out in before trying to turn it out. or
2: Build up the stud a bit until you can weld a washer then a nut to it and turn it out, working it back and forth gently. Which ever method you choose be sure to stuff a wet rag in the port. Watch your grounds as well, magnesium is bad for arcing under a loose or corroded ground clamp. Best bet would be to screw a bolt into the good boss, snug it up and use that to clamp your ground to...........Mike

Thanks...but it's recessed down into block maybe 1/8" or so. I wished it was sticking out, something to grab!

 

[ruffdog]

Use quality ez-outs.....not budget cheapos. Center punch as close to center as you can and drill down the center as straight as you can.

 

[Snobdds]

Any good ez out will have that out quick.

 

[mrmikey]

...but it's recessed down into block maybe 1/8" or so

That's the purpose of building it up before welding the washer then a nut on it. As long as you don't go haywire building it up, you won't have a problem as the steel weld won't stick to the magnesium.
If you're not comfortable welding, go the easy out route first, you then have welding as a back up method..........Mike

 

[dodge man]

A guess here, but the one bolt fell off and the other broke off because of it. Never heard of one coming apart like that. My experience is if a bolt breaks off but would have come loose with normal torque, and easy out will work.

You would be surprised how cheap parts are for your saw. My guess is a new cylinder (jug) would be less than $50 for a off brand name. On the bright side I can see your piston in one pic it looks in good shape. I rebuilt a MS250 for about a $100 that had a badly scored piston and cylinder.

 

[fried1765]

That's the purpose of building it up before welding the washer then a nut on it. As long as you don't go haywire building it up, you won't have a problem as the steel weld won't stick to the magnesium.
If you're not comfortable welding, go the easy out route first, you then have welding as a back up method..........Mike

1st .....center punch, and try a left hand drill bit.
Use the largest left hand bit possible without damaging the threads.
Use an EZ out if necessary thereafter.
Left hand bits alone will often do the job.

 

[dodge man]

If it gets messed up really bad, a Helicoil is an option also.