Sierra Marine engine parts are designed to meet or exceed the OEM part they are intended to replace and they are backed by the SeaStar Solutions Two-Year Warranty—one of the best in the business.
We offer a variety of O-rings, oil seals and seal kits for most engine applications on the water today—including MerCruiser, OMC, Johnson/Evinrude, Volvo and more.
The Sierra Engine Parts Selector
If you do not see the O-ring (or other engine part) you need, please visit the Sierra Engine Parts Selector, where you can search by engine make, model, serial number or year of manufacture.
| Sierra # | Application | Replaces OEM Part # | I.D. | Width | Qty. | Model |
|---|---|---|---|---|---|---|
| 18-7169-9 | Chrysler/Force/US Marine | 25-F24278 | 3.500″ | 0.135″ | 5 | 6368708 |
| 18-7169-9 | GLM | 82380 | 3.500″ | 0.135″ | 5 | 6368708 |
| 18-7169-9 | Mallory | 9-76551 | 3.500″ | 0.135″ | 5 | 6368708 |
| 18-7169-9 | Mercruiser Stern Drive | 25-35984, 25-70937 | 3.500″ | 0.135″ | 5 | 6368708 |
| 18-7169-9 | OMC Stern Drive | 911686 | 3.500″ | 0.135″ | 5 | 6368708 |





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