Yanmar 124772-42131 Shaft Impeller for Water Pump Cooling System
The Yanmar 124772-42131 shaft impeller is a precision-engineered replacement component designed for marine engine water pump systems. It plays a critical role in driving the impeller assembly that circulates seawater or coolant through the engine’s cooling circuit. This helps maintain optimal operating temperature and protects the engine from overheating during continuous operation.
Manufactured for compatibility with multiple Yanmar marine diesel engine configurations, this shaft is commonly used in raw water pump assemblies found in small to mid-range propulsion systems. It is frequently referenced in cooling pump breakdown diagrams and rebuild kits, making it a key service component for maintaining reliable engine performance in demanding marine environments.
Built to OEM standards, the shaft ensures proper alignment, durability, and efficient transfer of rotational force within the pump housing. It is typically replaced during full pump servicing or when wear, corrosion, or mechanical fatigue affects cooling efficiency.
Key Features
- OEM-style replacement shaft for Yanmar water pump systems
- Designed for high durability in marine cooling environments
- Supports impeller-driven raw water circulation
- Precision-machined for proper pump alignment
- Compatible with multiple Yanmar cooling pump assemblies
Applications
- Yanmar marine diesel engine cooling systems
- Raw water pump assemblies in small craft engines
- Engine rebuild and maintenance kits
- Seawater circulation pump systems
- Marine propulsion cooling circuits
Specifications
- Part Number: 124772-42131 (cross-referenced with 124772-42130 in many listings)
- Component Type: Water pump / impeller drive shaft
- Material: Industrial-grade marine metal alloy (OEM-grade)
- Fitment: Yanmar 2QM / 3QM series cooling pump assemblies (varies by configuration)
- Function: Drives impeller rotation for seawater circulation
FAQ
Q1: What does the Yanmar 124772-42131 shaft do?
It transfers rotational power to the water pump impeller, enabling seawater circulation through the engine cooling system.
Q2: Is this part interchangeable with 124772-42130?
Yes, many distributors list 124772-42131 as a variant or cross-reference of 124772-42130 depending on revision and application.
Q3: When should the impeller shaft be replaced?
It should be replaced during pump rebuilds or when corrosion, wear, or misalignment affects cooling performance.
Q4: What engines use this shaft?
It is commonly used in Yanmar 2QM and 3QM series marine diesel engines with raw water pump systems.
Q5: Does it come with bearings or seals?
Typically no—those are supplied in separate rebuild kits depending on the pump configuration.
CLRMarine
