Breather Tube Mods

[PiperCub_Flyer]

There's a procedure out there for Continental engines operated in cold climates that involves drilling a hole in the crankcase breather tube elbow and threading it to accept a screw. The screw is removed for cold weather ops to provide a secondary pressure relief outlet in the event that the breather tube becomes obstructed by frozen vapor. My mechanic believes it may be covered in a Continental or Cessna Service Bulletin and we'd like a copy of any documentation on this. Does this ring any bells with anyone?

I am not referring to the "whistle cut" in the lower end of the breather tube. This in the elbow that is attached to the case.

Thanks! Jack

 

[Original 1]

 

[J-3/PA11]

 

[d.grimm]

 

[farm-tim]

 

[Original 1]

 

[pj3cub1]

 

[cubdriver2]

 

[willyb]

 

[farm-tim]