Can this piston be saved?

[julian1234]

The attached photos are images of my scored piston on my stihl 009

Can this piston be saved, or do I need to get a new one (As well as perhaps a new cylinder)

Also, is there an easy way to get the pin bearings back in the crankshaft of these older model stihl saws?

Let me know

View attachment 1191011View attachment 1191012

 

[julian1234]

**Bump**

 

[sundance]

Says I don't have permission to view the attachments. Probably why you're getting no input.

 

[julian1234]

Sorry, here are the correct photos -

 

[lone wolf]

Piston is junk,likely cyl too.

 

[Cantdog]

Toast IMHO........COULD it be smoothed up and run again?.....sure.......but not to the potential of the saw or last very long. It's apart now so slipping a new piston in is just minutes work. More importantly is that you need to find the cause of this failure or the next piston may well look the same as this one in short order.

 

[julian1234]

Thanks for the input (When in doubt, ask the pros). I was given this saw, so I am unsure what caused the scoring... Let me know

 

[Mad Professor]

Thanks for the input (When in doubt, ask the pros). I was given this saw, so I am unsure what caused the scoring... Let me know

I'd look for a good used OEM P/C assy. The later ones were bigger , 40cc. Some other 01X cylinders will fit too.

That said you need to see why it scored.

 

[julian1234]

Do you have any ideas as to how it was scored?

 

[huskihl]

Being scored on the intake side as well, it was straight gassed

 

[julian1234]

Alright, thats what I figured. Thanks

 

[Vintage Engine Repairs]

It depends what you mean be saved really. You most certainly could clean up the piston carefully with a file to remove any high spots, put a new ring (you may be able to save that one) and clean the cylinder. It would probably be ok, saws are not high performance machines and can run with surprisingly damaged pistons and relatively loose tolerances .

However the only time you’d really want to do this is if the replacement parts are either NLA or ridiculously expensive. Here is a video on how to save a scored piston.

Do not use abrasive paper on the piston, just a file, very gently. The aim is to remove the high spots, not to remove the damage.
A thanks to @trains for teaching me this a few years ago. I’ve used it successfully many times.

 

[mountainlake]

You got to be kidding, get a new piston. Steve

 

[bwalker]

You got to be kidding, get a new piston. Steve

Exactly