394 teardown thread

[ggoodman]

so my milling saw is done. used it one last time to get half a cherry milled and it would not restart. thinking it was the carb I took it off and so my horror were lines or grooves on the intake side, took the muffler off and more lines on the piston. so off came the jug and there are scores on the jug as well. Deep enough I can feel them with my sterile gloved finger.
Also found a little play in the crank case bearing so it looks like a full tear down is coming. there rings were perfect so i am unsure if the jug is done or not.

more pics, questions, and advice request to come.

 

[ggoodman]

so my milling saw is done. used it one last time to get half a cherry milled and it would not restart. thinking it was the carb I took it off and so my horror were lines or grooves on the intake side, took the muffler off and more lines on the piston. so off came the jug and there are scores on the jug as well. Deep enough I can feel them with my sterile gloved finger.
Also found a little play in the crank case bearing so it looks like a full tear down is coming. there rings were perfect so i am unsure if the jug is done or not.

more pics, questions, and advice request to come.

 

[Sparkysparks9]

Looks to me like foreign material from poor filtering.

 

[ggoodman]

http://i277.photobucket.com/albums/kk73/GCGOODMAN/IMG_3594_zpstrpqihte.jpg

there are 2 score in the bore the more sever is on the exhaust side compression was ~154lbs.

should I just get a new piston and rings along with rebuilding the bottom end ie new seals bearing....or should I be hunting another jug to.
the cruddy brown stuff is from me tearing it apart there was nothing in the cylinder prior to tear down.
I was running a hightop OE filter.

GG

 

[Ozhoo]

Jug looks like it'll clean up fine. Piston looks like it could be cleaned up as well if you're on a budget.

 

[ggoodman]

quick search says acid(i have muriatic) on a q tip followed by 300 grit scotchbrite? as for the piston im at a loss.

 

[Ozhoo]

Acid has somewhat fallen from grace. There's hazards involved with it's use.

Watch MM clean one up on youtube

 

[Roll Tide]

I'd tear it down, replace everything except the cylinder. The Mastermind method of cleaning up cylinders works great

 

[birdcolonel]

I'd tear it down, replace everything except the cylinder. The Mastermind method of cleaning up cylinders works great

Between us Bama fans, can you elaborate on Randy's method for cylinder cleanup?

 

[Roll Tide]

Between us Bama fans, can you elaborate on Randy's method for cylinder cleanup?

Lol Roll Tide my friend. There is a thread on it here. It consist of using different grits of sand paper on a dremel, followed by scotchbrite. Takes less than 5 minutes. I seen it done on my 2100 cylinder that was in bad shape and it looked great afterwards

 

[71dart]

Click on the link in ozhoo's post #7. It's all there.

 

[ggoodman]

ok So some parts are ordered for the bottom end
Meteor piston kit with caber rings
crank seals/bearings
piston needle bearing
botom end gasket kit
After cleaning the jug it is now smooth. I can see the scoring but cant feel it. so given this should I still do the full mult grit dremal restore?
i'm planning on no base gasket or
So next parts order will be
Clutch side bearing
Carb kit
new on/off switch
fule lines/Filter

What am i not thinking of? bearing and seal wise?

 

[ggoodman]

We survived the storm used the 361 and 026 to remove 8 trees, 2 on my house the rest in streets or on neighbors houses. could have used the 394 for sure but the other saws got the job done... slower but done. so with like getting back to normal I am back to this project