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Thanks. I did not suspect leak because the diaphragm never expands upon heating....... I want to verify whether the balloon chamber receives hot air at all......how.. I wanted to know whether the position of displacer blocking the elbow when crank is at 6 O' clock is correct....... This follows from...

Checked for tightness of diaphragm, no luck :-(
Can you please answer my question on the position of displacer piston w.r.t elbow opening ?

Sir, the diaphragm is party balloon......I used double sided tape for sticking the elbow on the can........not sure how to check the diaphragm airleak......will try again.....

We straightened the cable from diaphragm and other other cable, no luck... 1) still figuring out why the balloon does not expand when heated.............is it because the steel wool piston diameter is close to diameter of lower can ? If we reduce the piston dia, will it help push hot gas move to top...

I am new to Sterling world...I am student of 14 yrs and am making a project for school with my team mates I tried to follow the website instructions and made it only to see it doesn't start....lack of narration and missing details make it difficult We followed all the instructions.... Appreciate if ...