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build up worn piston


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  #1  
Old 08-06-2011, 08:33:11 AM
Darryl Darryl is offline
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Default build up worn piston

hi, does anybody have experience in building up a very worn cast iron piston. it needs about 1/16" on thrust faces. it's 6 1/4" dia and about 15" long. thanks,darryl.
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Old 08-06-2011, 10:02:45 AM
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Elden DuRand Elden DuRand is offline
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Default Re: build up worn piston

Darryl:

At Portland one year, I saw an engine that, when running, had what looked like a brass piston. The owner said he'd built-up the cast iron piston with braze then turned it to size.

He added that the job had been done years ago and was holding up fine. I had to agree. The engine was running without the slightest sound of piston slap or blowby.

You might give it a try.

Take care - Elden
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Old 08-06-2011, 10:22:41 AM
Tom G Tom G is offline
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Default Re: build up worn piston

There used to be ads in Gas Engine Magazine for a company that built up pistons. They called the process "flame spraying". You might try a google search, and see what you can find.
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Old 08-06-2011, 12:36:27 PM
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Everett Hayden Everett Hayden is offline
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Default Re: build up worn piston

Tom & Darryl,
Flame spraying is a fairly common proceedure and it is probably a service available in most large cities. A friend in Phoenix told me it was used to build up crankshafts on Caterpillars where he was working so, it was a permanent type repair. The applicator must have some experience though, or the product would seperate from the built up item. Basically, a special torch is used that sprays powdered metal into the flame of the torch and onto the item to be built up. It is a good fix. I used it on my 3 h.p. Turner Simplicity piston. The engine works perfectly and you can not see anything odd about the piston after the application. My 2 cents.
Everett
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Old 08-06-2011, 09:03:09 PM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: build up worn piston

I have a flame spray rig I picked up when a local sugar mill closed, I've experimented on some shafts, haven't tried a piston yet. To prepare the surface you have to cut a course thread. This gives a clean area the weld can grab to, I was told not to touch it, that would contaminate it. The item is left in the lathe, preheated to about 200 degrees F, the spray applied while it's turning. My rig came with several different bottles of powder, the pistons I've seen done have a cast iron look, the powders I have are more of a stainless material used to repair seal area's on pump shafts. I haven't priced the powders but was told it's quite expensive.
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Old 08-06-2011, 09:40:56 PM
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Default Re: build up worn piston

The piston in my 7hp Sattley was built up on the skirt with babbett. She runs fine and quiet now.
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Old 08-07-2011, 08:41:40 AM
noname noname is offline
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Default Re: build up worn piston

I read in some publication that heating the piston red hot in the worn areas and quenching it cold water will swell the piston and it would hold.An old blacksmith told me the same thing so I gave it a try and it worked but not as well as the methods mentioned by the other lads.The piston ended up with lumps and I had to do some polishing to smooth it up.
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Old 08-08-2011, 05:20:16 PM
Langes Machine Shop Langes Machine Shop is offline
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Default Re: build up worn piston

The process that J.B. talks about is the Rototec method it does not work well for building up pistons. We have used a Eutectic spray gun with cast powder and have had good luck. We have also built them up with Bronze with no problem. The cast powder is more money than the bronze. Just putting my 2 cents in.
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Old 08-08-2011, 08:31:19 PM
Darryl Darryl is offline
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Default Re: build up worn piston

hi all, thankyou to all responces. i,m going to build piston up with bronze,that was my original idear but i just needed a confidence boost before i started because a replacement piston doesn't exist. i'll let you know how it works out. cheers and thanks, darryl.
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Old 08-08-2011, 09:25:57 PM
Jake Jacobs Jake Jacobs is offline
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Default Re: build up worn piston

It is possible to do the braze with a wire welder. I have fixed casting flaws in brass castings with brass(?) wire. Takes a lot of current. What does everyone think of this method? Has anyone else done this?
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Old 08-09-2011, 12:27:15 AM
Wayne Riedlinger Wayne Riedlinger is offline
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Default Re: build up worn piston

I met an older fellow about 25 years ago that said he worked for Rumley in Edmonton during the 30s and 40s. He said he built up many pistons by brazing.
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Old 08-10-2011, 08:18:47 AM
Ray Freeman Ray Freeman is offline
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Default Re: build up worn piston

I have got quite a few pistons built up using the arc spray process.I've mostly had them sprayed with aluminium bronze with good results.I usually bore the cylinder just enough to clean it up then spray and machine the piston to suit,make new rings and its as good as new.
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Old 09-08-2011, 10:43:34 PM
The motor kid pig guy The motor kid pig guy is offline
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Default Re: build up worn piston

Don't brazen it because you can't get it find someone who has tig or mig with cast iron wire and have them build it up that way you can still save it
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