Quicksilver 8597721 Cylinder Bore Seal

Quicksilver 8597721 Cylinder Bore Seal

Quicksilver 8597721 Cylinder Bore Seal is designed for select Mercury and Mariner outboards and JetDrive SportJets, including 135–200hp EFI/DFI engines and select 175–240hp JetDrive applications. It is used during engine service to support proper sealing within compatible cylinder bore assemblies.

This replacement seal is intended for maintenance and repair applications and is designed for straightforward installation using common shop tools. Always verify exact fitment using your engine’s owner’s manual or service documentation before installation.

Key Features

• Fits select Mercury and Mariner 135–200hp EFI/DFI outboards
• Fits select 175–240hp JetDrive SportJets
• Replacement cylinder bore seal for compatible engine service applications
• Designed for use during engine repair and maintenance procedures
• Easy installation with common shop tools
• Refer to owner’s manual or service manual for exact fitment details
• Replacement for part number 859772

California Residents: WARNING Cancer and Reproductive Harm - P65Warnings.ca.gov