OEM Quicksilver 818573 Cylinder Bore O-Ring for Mercury and Mariner 3.0L
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Description
Description
Quicksilver 818573 cylinder bore o-ring is an OEM service part for selected Mercury and Mariner 3.0L engines.
Verified application examples
- Cylinder bore sealing O-ring, distinct from the outer cylinder-head seal.
- Catalog examples include V200 DFI 3.0L, USA 0G386496–0T178499; V225 DFI 3.0L, 0G590000–0T178499; and V225/V250 EFI 3.0L, 0G129222–0T408999.
- Replacement cylinder heads or powerheads can require a different bore seal. Confirm the installed head design as well as the engine serial number.
Manufacturer part number: 818573
Match the engine serial number and original part number. These examples do not represent universal fitment across the listed horsepower classes.

