Description

The Yanmar 119773-42640 Impeller Kit is a complete seawater pump service kit designed specifically for Yanmar 6LP and 6LPA marine diesel engines. This kit restores proper raw water flow through the cooling system, helping maintain optimal engine temperature and preventing overheating.

The flexible rubber impeller is the primary wear component in the seawater pump, responsible for circulating cooling water through the heat exchanger. Regular replacement ensures reliable engine performance and protects against costly cooling system failures.

Built to meet or exceed OEM specifications, this kit delivers dependable performance in demanding marine environments.

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Key Features

• Complete raw water pump impeller service kit
• Includes flexible impeller, O-ring/seal, and hardware (as applicable)
• Designed specifically for Yanmar 6LP / 6LPA engines
• Restores proper seawater flow and cooling efficiency
• Direct OEM replacement fit and performance
• Marine-grade materials for durability and long service life

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Engine Compatibility

Yanmar Marine Diesel Engines

• 6LP Series
• 6LPA Series

Fits engines equipped with Yanmar seawater pumps using this impeller specification.

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Serial Number Fitment Notice

Fitment depends on the exact seawater pump configuration.

Always confirm:

• Engine model and serial number
• Pump model or housing type
• OEM part number match (119773-42640)

Some 6LP variants may use different impellers depending on year and pump version.

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When This Part Needs Replacement

Replace the impeller if you notice:

• Reduced or no water discharge
• Engine running hot or overheating
• Cracked, missing, or hardened impeller vanes
• Debris in cooling system
• After seasonal storage

Recommended service interval: every 100 hours or annually

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Installation Notes

• Lubricate impeller during installation (glycerin or marine grease)
• Install with correct vane direction
• Replace O-ring/seals included in kit
• Inspect pump housing and wear surfaces
• Check for broken vane fragments in cooling system

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Alternate / Superseded Part Numbers

OEM Cross References

• Yanmar: 119773-42640

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Aftermarket Cross References

• Johnson Pump: 09-824P-1 (common equivalent – verify fitment)
• Jabsco Equivalent: 17937 Series (verify by dimensions)

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Shipping

Shipping: Ships same or next day for fast Canada wide shipping.

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Parts Desk Insight

On 6LP engines, impeller condition directly affects engine temperature at higher RPM. A worn impeller may still pump at idle but fail under load—leading to overheating when you need power most.

Replacing it regularly is one of the simplest ways to keep your engine running strong and avoid unexpected issues on the water