o ring inspection

[RDRINK25]

I purchased a used housing. Not knowing when the oring has been replaced i purchased a new one. Taking the old one out it looks good is worth to keep it? How do I know its bad?

 

[Dsix36]

I purchased a used housing. Not knowing when the oring has been replaced i purchased a new one. Taking the old one out it looks good is worth to keep it? How do I know its bad?

The cost of o-rings is too cheap to be worried about keeping the old one. It can be very difficult to find fault with o-rings sometimes. They can look perfectly fine but still have a slight flat spot that is virtually impossible to notice.

 

[Larry C]

Good idea to start with a fresh one, but generally they stretch as they get old. It's a good practice to take the o-ring out regularly, wash your hands well and carefully wipe the o-ring down with your fingers, then apply a thin coating of the recommended grease until it is smooth and shiny. I use make-up swabs (the foam kind) to clean the groove. If you try to put the o-ring back and it deforms and seems too long to fit, it's time for a new one.