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R-1820 piston and wrist pin construction

 
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ckuhns



Joined: 13 Jul 2003
Posts: 36
PostPosted: Fri Aug 22, 2003 18:58    Post subject: R-1820 piston and wrist pin construction Reply with quote
I recently viewed a piston and wrist pin from a Wright r-1820 that was installed in A T-28.Instead of having two aluminum plugs in the ends of the wrist pin as do Lycoming or Contintenal engines this Wright piston had only one.A shoulder machined in the piston keeps the pin from contacting the cylinder wall on the side that does not employ the aluminum plug.The pin has a grove machined into its exrernal surface on the side which carries the aluminum plug.I wonder if the grove is for a puller.Are there any advantages to this type of construction?How does Pratt and Whitney secure their wrist pins? Thanks Carl Kuhns
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gwhite



Joined: 13 Jul 2003
Posts: 58
PostPosted: Sat Aug 23, 2003 08:16    Post subject: Re: R-1820 piston and wrist pin construction Reply with quote
kkuhns wrote:
I recently viewed a piston and wrist pin from a Wright r-1820 that was installed in A T-28.Instead of having two aluminum plugs in the ends of the wrist pin as do Lycoming or Contintenal engines this Wright piston had only one.A shoulder machined in the piston keeps the pin from contacting the cylinder wall on the side that does not employ the aluminum plug.The pin has a grove machined into its exrernal surface on the side which carries the aluminum plug.I wonder if the grove is for a puller.Are there any advantages to this type of construction?How does Pratt and Whitney secure their wrist pins? Thanks Carl Kuhns


P&W uses 2 plugs, one each end of the wrist pin. According the Wright manuals I have, they use a spring device rather than an aluminum plug. The groove you describe on the outer diameter of the wrist pin retains the spring.
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