391 rebuild, HELP! Please?!

[huskihl]

If it happens, you can always get tools. All you need for this it a long t27, a pair of needle nose pliers, vise grips, a half a dozen various screwdrivers, and a bfh

And an 8mm wrench or socket

 

[michaelmj11]

That's a big 10 4 on the BFH.

Big freaking hammer?

 

[michaelmj11]

ok is this clean enough to proceed, or do i need to get the Red gunk off the area around the Piston, and from the base of the Cylinder?

(I just put the thumbnails in the post, they should get bigger)

 

[michaelmj11]

And would this be a "GOOD" demonstration of 2 stroking vs 4 stroking?

 

[panteliss]

Mike,
Start with some shots of the piston and cylinder. Its an easy saw to put back together. let me know if you don't find the IPL/SM. I can get one if needed.
we need to find out what happened to the saw before we/YOU rebuild it.

start with ordering Stihl PN 5910 890 2415 its the long handle T27 wrench. I think it was $10 from stihl.

Let me know if theese T27 from stihl works good , i must order some pieces extra , usually loose them

 

[panteliss]

Assuming that's the new piston already mounted ? That's the hard part....everything else is duck soup.

1127 893 2602 two dollars and you make the part soft and your life also

 

[panteliss]

Agreed.

409 and or that Purple Cleaner work, or do I need something specific?

dish cleaner , a brush , and hot or cold water , so simple

 

[panteliss]

Which one is the crank? And ummm how do I know if there is a missing part?

this

 

[panteliss]

I bet there's no air leak in a seal. If it was running ok till it melted it was probably fuel and oil that got it.

i agree

 

[panteliss]

Yup, it is one of many reasons I went with a 661 as replacement, and (after reading on here) intend to start running 40/42:1 from here on.

this time i have 4 stihls and one husqy , i cut about 700-800 cubic meters per year , all of them with 50:1 with stihl ultra from the first tank , never have problem
maybe i am very lucky

 

[michaelmj11]

this
View attachment 8724

Do I need to remove some of/more of the red stuff around the crank case/piston or just put sealant on the Cylinder and let it glue/harden for a day?

 

[michaelmj11]

Purrfect...just don't let it "soak" fr too long. Most of the crud will come off with a blast off the compressor hose line.
Cover over the case with a rag so nothing gets in.

Did you mean the crank case?

 

[panteliss]

A lot of people don't believe the epa has a hold on oem's. The dealer should remove, center, and replace the limiter tabs if it's even possible. And show them how to tune a saw without a tach

He can show how to tune without tach ............. if he know how to do it , but the most of them open the specifications book read the high rpms put the tach and tune to the what the book say , no matter if the saw work corectly , no matter if this tach maybe have problem ................ then yes , you always do something wrong to the saw

 

[panteliss]

I don't even know what a ring compressor is. If you mean just an air compressor, I have one of those.....

this for 1127 series like your part number 1127 893 2602 ask definitive dave ( member here ) or stihl dealer

 

[panteliss]

Do I need to remove some of/more of the red stuff around the crank case/piston or just put sealant on the Cylinder and let it glue/harden for a day?

you always clean the old stuf before put new on , then after you assembley the parts leave theese silicones ( gasket makers ) for about 12-24 hours , to dry , then you can start the saw

 

[tree monkey]

why didn't you have the dealer put it together?

 

[michaelmj11]

why didn't you have the dealer put it together?

You mean 10 months ago, or when I finally got it back last week?

 

[panteliss]

I was hoping to find some of that loctite 518 stuff. Because in the Favorite Sealant Thread it sounded like the 518 was more forgiving to those who moved slower.

I have work from a cheapos to the most expensives , to tell you the truth are all the same *s-words , just leave them dry good for about 12 hours before you start the saw
now i use a cheapo , if you put the cheapo and the dirko to a can with fuel for 24 hours after they have dry you have the same results from theese two.

 

[tree monkey]

You mean 10 months ago, or when I finally got it back last week?

well, today

 

[panteliss]

well, today

How much????............