Which Chainsaw for Forestry

[adw]

I think i will give you a miss!, Husqvarna have used used replaceable seals in many saws, from the 140s through to the 346, i do not think your statement holds up, sorry.

[Stubby]

6 minutes ago, adw said:

I think i will give you a miss!, Husqvarna have used used replaceable seals in many saws, from the 140s through to the 346, i do not think your statement holds up, sorry.

Andrew ! . You are not sorry , I can tell ?

[Joe Newton]

9 minutes ago, adw said:

I think i will give you a miss!, Husqvarna have used used replaceable seals in many saws, from the 140s through to the 346, i do not think your statement holds up, sorry.

I seem to recall that you work for Husqvarna?

[Stubby]

2 minutes ago, Joe Newton said:

I seem to recall that you work for Husqvarna?

That's how he knows .

[Joe Newton]

16 minutes ago, Stubby said:

That's how he knows .

 Well yeah, that's kind of my point. It wasn't an accusation!

[Stubby]

2 minutes ago, Joe Newton said:

 Well yeah, that's kind of my point. It wasn't an accusation!

Ah . Understood Joe .  Big sorry ?

[stihlmadasever]

It was decifering the accusitory tone from your statement joe ?

 

[The Technician]

You have missed the point. All 2 strokes have seals. The way it has been done for years was you had the crankshaft, 2 bearings and 2 individual seals. The space between the seals and the bearings was usually 5mm. This 5mm was for cooling. In the 500 series, they put the seal in the bearing. This is why they don't last. I had one last week. A 555. Pulled off the exhaust and score marks. Pulled off the clutch and the seal spring was wrapped around the crankshaft.  It's usually the chain (PTO) side that goes as the shavings and oil get in it and the seal let's go.

[peatff]

2 hours ago, The Technician said:

It's usually the chain (PTO) side that goes as the shavings and oil get in it and the seal let's go.

If the seal is working how do they get in, does it only seal from the inside ? I don't understand that bit.

[The Technician]

The seal is rubber and it touches the crankshaft it also has a coil spring around it. If you get heat from the crankcase or shavings that get to the seal to tear it, you will get an air leak. In the engine, the fuel, oil and air is in an atomised and pressure state. If a seal goes, air gets in and this state collapses, causing lack of lubrication around the piston, rings and cylinder.