What's on your bench today?

[spudulike]

Cheers Steve, i'll measure it tomorrow but i'm thinking it might be best to go new.

Have you bought from Forest World Ltd on ebay before?

 

Yes, but not for some time. Think I purchased Meteor pistons from them but not sure TBH!

[spudulike]

Been working on a MS660 that had shattered a piston, the bore had a score on the inlet side but fortunately ended below the top of the exhaust port so well off the compression forming part of the bore.

 

Tried turning the engine over and it locked up on one part of the stroke. Investigated this and found a piece of piston embedded in to the inner crankcase so removed it. Purged the crankcase cavity, ported the cylinder and then rebuilt it.

 

It had a massive air leak and found the piece of piston had smashed through to one of the recessed turrets that the bolt locates in to under the flywheel, I filled this with JB weld and then found another leak in another turret - these are under the flywheel so not the easiest or most logical places to find leaks.

 

Checked it out and think there is a hairline crack in the second turret so filled it with JB weld and now it is air tight and pretty strong as the wall of the crankcase is pretty thin and now supported by a tough epoxy resin.

 

The saw now runs and is back from the edge of scrap:thumbup:

 

The pic below is the punctured hole in the first turret.

[lewisyounger16]

Any chance this is salvageable?

 

 

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[lewisyounger16]

The other side:

 

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[spudulike]

The other side:

[ATTACH]196592[/ATTACH]

 

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Yes, it looks very salvageable. I have taken 0.5mm of aluminium off cylinders before and got the engines singing again:thumbup:

[lewisyounger16]

What can I buy in shop to remove alu transfer?

 

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[spudulike]

What can I buy in shop to remove alu transfer?

 

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Any acid - battery acid or brick cleaner or caustic soda, high power oven cleaner, sodium Hydroxide etc

 

Acid or alkali will dissolve aluminium - if it fizzes on contact, it is doing the job:thumbup:

[lewisyounger16]

Do that before some wet and dry?

 

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[lewisyounger16]

Got some brick cleaner, 5 litres of the stuff, used about 3 cotton buds worth haha. Vast improvement however on the exhaust side below the port even though it's hardly visible and barely even able to feel it there is still some deeper scoring there.

 

Ive been honing for an hour or so and that's the end result, is os serviceable now or more honing?

 

 

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[spudulike]

Looks OK to me!