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Hot Air Engines

8 inch Denny Piston "HELP"

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Old 01-09-2017, 03:49:15 PM
Mark K Mark K is offline
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Location: Welland, Ontario, Canada
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Default 8 inch Denny Piston "HELP"

I finally got my walking beam repaired. I decided to pull the piston out to check it. The leather ring appears to be ok however there is a thin gasket that appears to have been glued to the top of the transfer piston that is broken. I do not see it in my parts book. Is it necessary? This engine ran for the former owner before the walking beam was damaged. I am new to hot air engines. This is the first on I have had apart. Thanks
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Old 01-09-2017, 07:07:57 PM
Brent Rowell Brent Rowell is offline
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Default Re: 8 inch Denny Piston "HELP"

I've never had a Denny but can't imagine why it would have a gasket on the displacer as it should never touch the cylinder walls. Maybe there was an air leak in the top and someone glued that on as a patch(?). Leaks anywhere in the displacer with slow down or stop the engine, so it should be checked very carefully.
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Old 01-17-2017, 09:22:23 AM
Mark K Mark K is offline
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Default Re: 8 inch Denny Piston "HELP"

Got the engine back together yesterday. I put a propane burner in the firebox and fired it up. It ran good. I also discovered what I believe to have caused the walking beam to break in the first place. The check valve in the bottom of the water pump had came apart and the disc stood up on end causing the pump to jam at the bottom of the stroke, in turn transferring the force up and breaking the walking beam. I will replace the brass nut that holds the check disc in place with a stainless steel lock nut. I was told by the former owner that the walking beam broke when the engine was in operation but he had walked away for a moment and when he returned the beam had broken.
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