Brand new MS391 meltdown

[Stumpzero]

The arrows are where the brake band connect . They are fine. The oil line coming from the oil tank is good as well . Looks worse than it is. The tention on the band keeps it right against the clutch drum . I can’t see how it could move much.

 

[Stumpzero]

Looks quite good, the oil pickup/black rubber hose at bottom right in thee top pic looks like it has been heat damaged, should be replaced. The vert top brake band holding lug looks to be either missing or still under some of the melted plastic, only tell for certain when the brake band is installed and all linkage connected to the brake handle.

 

[ZeroJunk]

It’s held in place with a screw at one end and attached to the brake mechanism at the other and neither of those areas was effected by by the melted plastic. The areas that the band might ride against are still there.

I bet it will be fine. What you can do to your own saw and what a dealer can do and stand behind with his reputation are different.
If I was the dealer I would have replaced the crankcase, if it was mine I would tried to do as good a job as you did.

 

[Stumpzero]

I bet it will be fine. What you can do to your own saw and what a dealer can do and stand behind with his reputation are different.
If I was the dealer I would have replaced the crankcase, if it was mine I would tried to do as good a job as you did.

 

[Stumpzero]

I would replace the crank case, but I’m not that familiar with chainsaws and if this fix works then I’m good. This will be my back up saw.

 

[Old2stroke]

$100 for a new oem case, I’d get one, new seals and new clutch springs - will be as good as new. https://www.ebay.com/itm/324863121401

That’s nice, as long as the OP has the ability to do the work

 

[Stumpzero]

The dealer wanted $719.49 to do the repair. Apon looking over the invoice they double charged
Me for several items and charged me for some parts that were not effected.

 

[Stumpzero]

That’s nice, as long as the OP has the ability to do the work

I could probably do it but I don’t have the best setup to do it and frankly my patience is a little on the thin side these days as I get older.

 

[Vintage Engine Repairs]

That’s nice, as long as the OP has the ability to do the work

You only need a torx bit and an 8mm lol

 

[Vintage Engine Repairs]

I have the new parts on order . I did not get the case at this time . The chain break strap fits in place very nice and firm after the case clean up with a drimel tool. Before and after cleaning the case. View attachment 1242343View attachment 1242344

You did a good job on cleaning it up but I’d suggest re-considering a new case. Note what Jerry said about hoses and brake band. Not to mention new seals. It’s a very simple process to rebuild one. Enjoy the process, you already have a good working one now and winter is a great time to tackle it.

 

[stihltech]

Experience says you will most likely be fine. See a lot of these over the years. If you want perfect, get a case. If you want a saw that does what it needs to, you will be good.
All that said, be weary of erratic running after. It can be a bit rough on the seal and crank bearing on that side.

 

[ZeroJunk]

The dealer wanted $719.49 to do the repair. Apon looking over the invoice they double charged
Me for several items and charged me for some parts that were not effected.

Sounds like they just didn't want to do it.

 

[Vintage Engine Repairs]

Sounds like they just didn't want to do it.

When you give the overpriced quote because you don’t want to do job and someone accepts it anyway

 

[Stumpzero]

Sounds like they just didn't want to do it.

Oh at that price im sure they wanted to. The parts that I got cost me $178 and if I had got the case it would be $284 . Lot of profit for them.

Sounds like they just didn't want to do it.

 

[stihltech]

There are times when it is best NOT to do a job like this at a dealer. Once you work on it, you own it. Age and condition of saw are the main factors. And lately- sentimental value. (It has been in the family for years). You must tread very carefully in those situations.

As far as you fixing yourself, go for it. Yes much less cost without labor. As long as you are able.

 

[Stumpzero]

There are times when it is best NOT to do a job like this at a dealer. Once you work on it, you own it. Age and condition of saw are the main factors. And lately- sentimental value. (It has been in the family for years). You must tread very carefully in those situations.

As far as you fixing yourself, go for it. Yes much less cost without labor. As long as you are able.

This was my very first chain saw and had 1 hour of run time on it. I’ve never worked on a chain saw before but worked on many different types of small and big engines in my life. My goal is to have a very good back up chainsaw

 

[Stumpzero]

All put back together, oil pump adjusted. Zero binding on the Chain brake. Zero binding on the chain sprocket/clutch drum. Chain brake works perfect. Chain Oiler working great. Saw seems to be ready to go. I even sharpened my first chain and put it on this saw. Nice to have a back up/ Second saw on my trailer. The low Idle seems to be very high still. High Idle seems to be very high as well. I’m going to take it by the dealer to see what they think As this is my first chain saw not sure on what the idle should be like but comparing it to the second saw I purchased (same exact model) it idles much much faster.

All put back

 

[ZeroJunk]

Is the low idle high enough to turn the chain with the chain brake off ?

If it is take a small flat screw driver and turn the LA adjustment CCW until it stops.

That's all the dealer is going to do.

 

[Stumpzero]

Is the low idle high enough to turn the chain with the chain brake off ?

If it is take a small flat screw driver and turn the LA adjustment CCW until it stops.

That's all the dealer is going to do.

Yes the chain spins very fast on low idle with the chain brake off. Thanks for the information. Probably what burned up this saw to begin with.

 

[Lee192233]

Yes the chain spins very fast on low idle with the chain brake off. Thanks for the information. Probably what burned up this saw to begin with.

Crank seal is probably leaking on the clutch side. Should've gotten new seals and resealed the pan. Spray some carb cleaner under the clutch while it's running to see if the idle is affected.