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Can you weld the top of a piston?

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Old 08-01-2007, 12:04:20 AM
Steve Page Steve Page is offline
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Default Can you weld the top of a piston?

I have a Cushman Cub R14
Can a slug be machined and fitted into it then welded?
The ring grooves are fine.What about any distortion if any?
I'm not sure if it's Cast Iron or Steel. It's very hard. A file
barely scratches it
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Old 08-10-2007, 04:46:20 AM
Forrest Stewart Forrest Stewart is offline
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Default Re: Can you weld the top of a piston?


Seeing no reply, I'll put you into overload.

One way to tell if the piston is steel or cast iron...Spark test...Very lightly touch a stone grinding wheel with a part of the piston that won't obtain any damage...If the spark stream is long, a foot or more, and bright and has lot's of sparkles it is steel.... For a test, spark some pieces of mild steel then an old file which is hard tempered and observe the spark stream...Back to the piston, If it is cast iron or other cheap forms of iron, the spark stream will be dull yellow and only a vey few inches long, 5" or less, with almost no sparkles.

You said the piston seemed to be very hard which would indicate it is cast iron.

Aluminium, pot metal, lead, stainless steel and copper won't make any sparks. I doubt if your piston is any of these. However, I have long since learned to never say never. Aluminium is used in almost all new modern internal combution engines.

Depending on what the hole or crack in your piston is like, you can electric or arc weld it if it is mild steel. If it is cast iron you should probably have it brazed with bronze. Arc welding cast iron can be done by pre-heating first and that is a hot job and can be tricky.

The warpage by welding probably won't be a problem and if there is warpage the piston can be dressed to fit again.

Don't forget you can use a piston from a different engine, even a different make engine with similer sizes in case you can't fix or find an origional like yours.

Hope this all is of some help.

Back to the shadows of Buffalo Bill.
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Old 08-10-2007, 04:09:41 PM
Douglas Douglas is offline
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Default Re: Can you weld the top of a piston?

How does one go about finding another piston from something else?

Seriously, are there books with lists of pistons by size aplication and make?

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Old 08-26-2007, 10:13:10 AM
Kelly Tytlandsvik Kelly Tytlandsvik is offline
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Default Re: Can you weld the top of a piston?

Try an engine rebuild shop. They have a pretty good idea how to find a piston that will work to replace the old one. Take the old one along with you to measure off of.

Kelly T
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