Haha, fragile electronics in a chainsaw that broke a lot....... Glad they haven't gone down that road again!
I got a few hours in the garage this afternoon to start getting an 066 built.
Cleaned everything......... boring
Warmed up the bearings and slid them onto the crank shafts
Tapped the alignment pins into the flywheel half of the case so they were just poking out a bit.
Heated up the flywheel half of the case and slid it onto the bearing.
I applied a very thin layer of motoseal 2 to the crank gasket surface and sat the gasket in place. I then applied another thin layer of motoseal 2 to the top of the gasket.
Heated up the other half of the case and slid it down over the bearing until it hit the alignment pins. This left me with a 3mm gap.
I assembled it this way because when pulling the 2 halves together with screws, it is pushing against the locating bearing on the flywheel side, which then sets the clutch side bearing to the correct position when the 2 halves are pulled down tight.
Tapped in the oil seals with sockets that pushed the outer edge of the seal. Pre oiled all seals, seal surfaces and bearings.
After the clutch side was clamped down tight, It took a tap on the flywheel side shaft with a nylon hammer to center the crank and relieve all the pressure off the bearings.
It then spun smoothly and freely, with the entire assembly happening without having to hit it with a hammer.
![banana :banana: :banana:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Bashing it together with a hammer just damages the bearings. It leaves little tiny dint's that are like a small hole in the road. The more it gets run over, the bigger it gets and you end up with premature bearing failure.
I cleaned up the OEM piston and removed all the little casting lips in the port windows, smoothing them out.
Fitted the piston up with a new small end bearing on the original Stihl wrist pin which is much lighter than the after market one.
Fitted a new Hyway gasket and bolted down the jug, checked squish at 4 points and got 0.019 to 0.021 so I will run it at that.
Fitted new Caber rings.
Thin smear of Motoseal 2 on the case flange, then bolted down the jug.
Cracked a cold beer to celibate.
From here on it it's just a jigsaw puzzle.
Fitted new oil line and pump seal ring.
New impulse line.
New clutch and sprocket
All new AV rubbers
New spark plug.
I got it to this stage, just about ready to fire up, but had to go out to dinner with the wife and some friends.
Should get it finished off tomorrow morning
It is starting to look like a saw again.
It was upsetting looking at 2 of them as a filthy jigsaw puzzle all over the bench.
Only problem I hit is that the thread is stripped in one of the top cover holes.
I am thinking of filling the hole with JB Weld and re drilling and tapping it.