oil pump machining for oring

[j-f]

Hi,

Can somebody tell me the size of the groove to add an oring to a oil pump?

Oring is 70mm x 1.75mm.

Thanks 

[PPRMicke]

same as O ring Width 1.75 deep 0,87mm  (can go down to 1mm)
/// M

[j-f]

same as O ring Width 1.75 deep 0,87mm  (can go down to 1mm)
/// M

Thanks,

So it sits flush with the pump case and seals with oil pressure?

[samotorsport]

No leave it out a bit , if you go down lets say to 1 mm with the groove , it still sticks out 0,75 mm if the o ring is a 1,75 thick one .
If it is flush with the pump case it will not seal .

[RMS Boxer Service]

The groove must be wide enough to allow the O-ring to be crunched when installed. If the groove is too narrow
the O-ring will have nowhere to go/expand and it will be cut when installed If the groove is too wide the O-ring will
loose crunch as it can wobble/snake in the groove.
Sorry for my bad tech terms, but try Google "O-ring groove design"

Here is a good site:
https://www.sealanddesign.com/page/o-ring-groove-design-metric

/Rolf

[j-f]

The groove must be wide enough to allow the O-ring to be crunched when installed. If the groove is too narrow
the O-ring will have nowhere to go/expand and it will be cut when installed If the groove is too wide the O-ring will
loose crunch as it can wobble/snake in the groove.
Sorry for my bad tech terms, but try Google "O-ring groove design"

Here is a good site:
https://www.sealanddesign.com/page/o-ring-groove-design-metric

/Rolf

That's what I've read, but being not a machinist, I wasn't sure I understood correctly 
Thanks for the info.
I don't know if it is worthwhile to do it, but on the other hand, not a big job to do.