Compatibility: Tailored to fit a range of Yanmar engines including 3TNE84, 3TN84, 4TNE84, 4TNV84, 4TNE88, and 4TNV88. These engines are commonly used in agricultural machinery, construction equipment, and small - to - medium - sized generators.
Part Number: 729428 - 42004. This unique identifier is crucial for accurate part procurement and replacement.
2. Construction and Design
Casing Material: The water pump casing is typically made of a durable alloy such as cast aluminum or cast iron. Cast aluminum offers good heat dissipation and a relatively light weight, while cast iron provides excellent strength and resistance to wear and corrosion.
Impeller: The impeller is a vital component and is usually made of a corrosion - resistant material. It could be a high - quality plastic composite or a non - ferrous metal like brass. The impeller's design, with its blade shape and number of blades, is optimized to ensure efficient coolant circulation. The number of blades can vary, but it's generally designed to achieve a balance between flow rate and pressure.
3. Performance Specifications
Flow Rate: The water pump is designed to provide a specific flow rate to meet the cooling requirements of the Yanmar engines. It might have a flow rate in the range of 20 - 60 liters per minute (L/min), depending on the engine's specific cooling needs and operating conditions. This flow rate is essential to ensure that enough coolant is circulated through the engine block, radiator (if applicable), and other cooling components to maintain the engine's temperature within the optimal range.
Pressure: It can generate a pressure in the range of 0.8 - 2.5 bar (11.6 - 36.3 psi). This pressure is necessary to force the coolant through the engine's cooling passages and hoses, ensuring that all areas of the engine that require cooling are adequately served.
4. Mounting and Installation
Mounting: The water pump has a specific mounting configuration to fit the Yanmar engines. It comes with mounting holes and a mounting flange that are designed to align precisely with the engine block. The bolt holes are usually spaced according to a standard pattern, and the bolts are of a specific diameter and length (for example, M6 or M8 bolts with a given pitch).
Shaft and Pulley: The pump shaft is sized and shaped to interface with the engine's drive pulley. The shaft diameter might be around 15 - 25 mm and is machined to a fine tolerance. The pulley that drives the water pump has a specific diameter and groove pattern to ensure the correct rotational speed ratio with respect to the engine's crankshaft pulley.
