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Machine Shop and Tool Talk

Large Piston Ring Expander


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  #1  
Old 06-17-2017, 11:02:07 AM
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JBoogie JBoogie is offline
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Default Large Piston Ring Expander

Hello,

What is everyone using for large ring expanders? I'm talking for pistons 6-12 inch diameter. I ordered one from McMaster that goes to 7 1/2, it's a pliers type. I contacted the manufacturer (Zimm in Chicago) and they make larger ones but they are a hell of a lot more that the $18 I paid for the pliers type. All of the rings I deal with are different widths and they're step cut. Open to suggestions.
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Old 06-17-2017, 10:03:25 PM
Rob Charles Rob Charles is offline
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Default Re: Large Piston Ring Expander

I use a pretty large Mac retaining ring pliers. They are about 16" ish long. Rob
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Old 06-18-2017, 10:38:47 AM
TomBall TomBall is offline
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Default Re: Large Piston Ring Expander

Not sure what pistons you are removing rings from. I remove and install rings on large antique gas engines with strips of heavy sheet metal cut in strips about 1/2 or so inch wide and several inches long. I just keep sliding strips under the ring and around the piston until the ring is above the ring groove, then just slide them off. Takes longer I'm sure but it works for me. Never tried other methods, so I wouldn't know where to find the tools.
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Old 06-18-2017, 12:56:19 PM
akuna akuna is offline
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Default Re: Large Piston Ring Expander

I bet you never break a ring either.

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Originally Posted by TomBall View Post
Not sure what pistons you are removing rings from. I remove and install rings on large antique gas engines with strips of heavy sheet metal cut in strips about 1/2 or so inch wide and several inches long. I just keep sliding strips under the ring and around the piston until the ring is above the ring groove, then just slide them off. Takes longer I'm sure but it works for me. Never tried other methods, so I wouldn't know where to find the tools.
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Old 06-19-2017, 09:23:16 PM
Wayne Riedlinger Wayne Riedlinger is offline
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Default Re: Large Piston Ring Expander

Ive always done them wit strips of sheet metal too. Works good and dosent cost anything but my time.
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Old 06-20-2017, 10:34:04 AM
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Default Re: Large Piston Ring Expander

I need something mostly for installing rings on aluminum pistons. I want an expander, not to be fooling around with shim stock and stuff.
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