OEM Quicksilver 8597721 Cylinder Bore Seal for Mercury and Mariner
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Description
Description
Quicksilver 8597721 cylinder bore seal is an OEM service part for selected Mercury and Mariner engines.
Verified application examples
- For selected 135–200 hp EFI/DFI outboards and 175–240 hp SportJet engines.
- Catalog examples include V135/V150 DFI, USA 0G960500 and up; V175 DFI, 0T178500 and up; and V200 EFI 2.5L, 0T409000 and up.
- This is the bore seal; outer head seals and complete gasket kits are separate service parts.
Manufacturer part number: 8597721
Match the engine serial number and original part number. These examples do not represent universal fitment across the listed horsepower classes.

