Fuel Selector Valve Rebuild?

[Yetti]

On 7/6/2021 at 4:20 PM, Ragsf15e said:

Just a laymen’s perspective, but that thing is a single point of catastrophic failure.  If it’s questionable, I’d definitely dig into it.  If something isn’t right and it comes loose when you’re switching tanks, it could get really quiet.

a point of clarification: catastrophic failure is the shuttle breaking up over Dallas at mach 15.    Wings folding is a catastrophic failure.   Fuel selector valve while may stop the engine would just be an inflight emergency.

[Ragsf15e]

12 hours ago, Yetti said:

a point of clarification: catastrophic failure is the shuttle breaking up over Dallas at mach 15.    Wings folding is a catastrophic failure.   Fuel selector valve while may stop the engine would just be an inflight emergency.

Unless you’re over the North Atlantic.  At night.

[mike_elliott]

Because this component has the same effect when failed as an engine failure, its proper maintenance should rate high on everyone's personal MX minimums. One might begin with a simple logbook check of just when the last time this component was rebuilt. Is it fair to ask them to last 60+ years without new o rings even? Surprisingly, most will have corrosion in the "bowl" area from moisture over the years, and this may be cause if bad enough to warrant unairworthy in the eyes of some. Almost all of the older Mooney's I have reviewed logs for have not had even the screen cleaned per logs.  As the manual suggests, it should be "renewed" every 500 hrs for the sake of the o rings alone.

Which brings up the question for you IA types...could a blue silcone type O ring be legally used as replacements on the shaft?

 

[OR75]

6 hours ago, mike_elliott said:

Because this component has the same effect when failed as an engine failure, its proper maintenance should rate high on everyone's personal MX minimums. One might begin with a simple logbook check of just when the last time this component was rebuilt. Is it fair to ask them to last 60+ years without new o rings even? Surprisingly, most will have corrosion in the "bowl" area from moisture over the years, and this may be cause if bad enough to warrant unairworthy in the eyes of some. Almost all of the older Mooney's I have reviewed logs for have not had even the screen cleaned per logs.  As the manual suggests, it should be "renewed" every 500 hrs for the sake of the o rings alone.

Which brings up the question for you IA types...could a blue silcone type O ring be legally used as replacements on the shaft?

 

not sure an IA would answer that ...