Re: dimensions for 18-7117 / 303360 O ring

[Anonymous]

quote 1946Zephyr:

What is this o ring for?

https://www.amazon.com/Sierra-Internati … B001RI5YPK
says:
Sierra International 18-7117 Marine O-Ring for OMC Sterndrive/Cobra Stern Drive

http://www.marineengine.com/newparts/pa … SIE18-7117
says:

Replaces OEM #0303360.

18-7117 O-Ring

Replaces: 303360, 25-35027

I.D.- 1.046
Width- .139

Sierra Marine O-ring is equivalent to parts:

303360 Evinrude Johnson OMC BRP
25 35027 Mercury Marine
9-76507 Mallory Marine

Additional information about this part can be found on page(s) 296, 739 of the Sierra Marine catalog.
(links followed below):

http://www.marineengine.com/parts/sierr … -00296.htm
Johnson Evinrude OE Part: 303360
ID 1.060 (!!!)
Width 0.135

http://www.marineengine.com/parts/sierr … -00739.htm
Mercruiser OE part: 25-35027
ID 1.046
Width: 0.139

So….. If the Sierra part doesn’t fit quite right (as they often don’t) you know why!