Should I reuse this piston?

[RedFir Down]

This piston is out of a Dolmar 5100S and I was wondering if I could clean / polish it up and reuse it with a new ring?

 

[RedFir Down]

Pictures

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[PA Dan]

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What's it for? I'd say no.

 

[Czed]

I wouldn't use it personally
Pistons are wear parts and need changed eventually
I'd do seals too.

 

[RedFir Down]

What's it for? I'd say no.

Dolmar 5100S

 

[PA Dan]

Dolmar 5100S

I did see that after I replied. I don't believe there is a Meteor for the 5100 and those pistons aren't cheap!

 

[RedFir Down]

Those are my findings as well. If I could throw a $40 meteor in it I would have it ordered. OEM is around $90 and the only after market I see is from Little Red barn that is cheap but I wont use it.

 

[Lightning Performance]

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Polishing the area having the carbon scar only above the bottom of the wrist pin to the top. No need to touch the skirt area. It will be best served with a very rough finish to retain some oil. 120 grit and... run it.

 

[Fruecrue]

If I planned to keep the saw until it or I met an end, and the cylinder cleaned up well, I may use it.

If it ever were to go up for sale, big nope.

under the first scenario, I would take care to only remove any high spots and not unduly reduce the diameter.

 

[andyshine77]

Clean it up with a Scotch-Brite pad, add new ring and run it for the next ten years.[emoji111]

 

[RedFir Down]

This is where I'm at so far.
What do you think?



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[PA Dan]

For a keeper I'd run it.

 

[P.M.P.]

This is where I'm at so far.
What do you think?

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That looks great. What are you using?

 

[Lightning Performance]

Just use a straight edge to check for high spots. It will never feel smooth but no bumps is all that matters. This part of your piston should never touch anything anyway. They have a taper built in called the barrel shape. Fattest part is the middle of the piston or there abouts.

 

[Lightning Performance]

This is where I'm at so far.
What do you think?

View attachment 280636View attachment 280637

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Stay off the skirt area. Grey streak spots mean nothing imo.

 

[RedFir Down]

That looks great. What are you using?

180 grit emery cloth and a green Scotch Bright pad.

 

[RedFir Down]

Thanks for the tips guys, I appreciate it! I'll finish it up tomorrow. I have to get a parts list going for an 064 on the bench.

 

[jk14]

That looks great. What are you using?

Looks serviceable. My biggest concern now would be the ring land, definitely don't want it to stick a a ring.

 

[RedFir Down]

Looks serviceable. My biggest concern now would be the ring land, definitely don't want it to stick a a ring.

I agree. That is why I'm going to finish it off tomorrow... I don't like cleaning ring lands, time consuming and meticulous.

 

[andyshine77]

I agree. That is why I'm going to finish it off tomorrow... I don't like cleaning ring lands, time consuming and meticulous.

Get some 600 grit in there, if you don't feel it catch and you don't see anything obvious it will be fine.