Sierra Impeller Kit for Mercruiser and Mercury marine engines, model 18-3217

The Sierra Impeller Kit for Mercruiser and Mercury marine engines, model 18-3217, is a reliable replacement cooling system kit engineered to maintain optimal engine temperatures and water pump performance. This kit provides essential components, including a durable rubber impeller, designed to ensure efficient water circulation and protect your boat motor from overheating during operation.

Advantages

Using this genuine Sierra replacement part helps restore water pump efficiency and prevents premature engine wear caused by cooling system failures. The high-grade rubber construction offers reliable flexibility and durability against wear in marine environments, supporting consistent water flow and extending the lifespan of your cooling system components.

Suitable for

• Routine maintenance of Mercruiser and Mercury marine engine cooling systems
• Replacing worn or damaged water pump impellers in boat motors
• Preventative servicing before the boating season

When it may not be suitable

This kit is not compatible with engine models outside of the specified Mercruiser and Mercury applications. It is also unsuitable if the water pump housing is severely damaged, scored, or worn beyond standard service tolerances, in which case housing replacement may be necessary.

Key specifications

• Brand: Sierra
• Application: Mercruiser and Mercury marine engines
• Component type: Water pump impeller kit
• Material: High-quality flexible rubber and associated hardware

How to use

Begin by disconnecting the battery and draining the cooling system if necessary. Access the water pump housing located on the stern drive or engine block, remove the old impeller carefully, and clean the housing interior. Inspect all components for wear, lubricate the new Sierra rubber impeller with a suitable lubricant, and install it into the housing ensuring proper blade orientation. Reassemble the housing securely and test the water flow upon restarting the engine.

What to consider before purchase

• Verify compatibility with your specific Mercruiser or Mercury engine model and serial number
• Check the condition of the water pump housing to determine if additional replacement parts are required
• Ensure you have the correct basic tools needed for marine cooling system maintenance

Usage recommendations: Inspect the water pump impeller at least once a year or every 100 hours of operation, whichever comes first, and replace it immediately if signs of cracking, stiffness, or missing blades are observed to prevent engine overheating.