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Title: oil pump machining for oring Post by: j-f on May 01, 2020, 18:10:06 pm 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 ;) Title: Re: oil pump machining for oring Post by: PPRMicke on May 01, 2020, 18:57:02 pm same as O ring Width 1.75 deep 0,87mm (can go down to 1mm)
/// M Title: Re: oil pump machining for oring Post by: j-f on May 01, 2020, 19:01:31 pm 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? Title: Re: oil pump machining for oring Post by: samotorsport on May 01, 2020, 19:25:52 pm 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 . Title: Re: oil pump machining for oring Post by: RMS Boxer Service on May 02, 2020, 18:35:11 pm 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 Title: Re: oil pump machining for oring Post by: j-f on May 03, 2020, 19:22:20 pm 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. |