Sierra 18-9075 Water Pump Drive Shaft Spacer

The Sierra 18-9075 is a water pump drive shaft spacer designed as a direct replacement for Yamaha and Mercury outboard engines. This precision-engineered component is a critical part of the water pump assembly, positioning between the drive shaft and impeller housing to ensure proper impeller alignment and optimal cooling system performance.

Key Features:

• Direct OEM replacement for Yamaha part number 61A-45538-00-00
• Also replaces Mercury part number 23-888690
• Manufactured to meet or exceed original equipment specifications
• Essential component for water pump rebuilds and maintenance
• Precision-engineered for proper fit and function

Sierra marine parts are engineered to withstand harsh marine environments and meet the demands of high-horsepower outboard engines. This spacer is commonly used during water pump service intervals and should be replaced whenever rebuilding the lower unit water pump to ensure reliable cooling system operation.

Note: This spacer is often sold separately from water pump rebuild kits and should be ordered as a maintenance item when performing water pump service.