Description

The Onan 132-0498 Impeller is a genuine-style replacement raw water pump impeller designed for Onan marine generator cooling systems. This impeller is critical for maintaining proper water flow through the generator, preventing overheating and ensuring reliable performance under load.

Constructed from marine-grade neoprene with a brass hub and keyed shaft design, it delivers consistent flexibility and durability in both freshwater and saltwater environments.

This impeller is commonly used across a wide range of Onan 6.5kW–10kW marine generators, making it one of the most frequently serviced cooling components in generator maintenance.

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Key Features

• Direct replacement for Onan 132-0498
• Marine-grade neoprene construction
• 12-blade flexible impeller design
• Brass hub with keyed shaft
• Designed for generator cooling systems
• Reliable OEM-style fit and performance

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Engine Compatibility

Onan Marine Generators

Commonly used on:

• MDKAA
• MDKAB
• MDKAL
• MDKAV
• MDKAW
• MDKAZ
• MDKBG / MDKBK / MDKBL / MDKBM / MDKBN
• MDKDK / MDKDL / MDKDM / MDKDN

Typically found on 6.5kW to 10kW marine generator systems

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Pump Compatibility (Primary Fitment)

Used in Sherwood pump assemblies, including:

• Sherwood R30G
• G701 / G702 series
• Equivalent Sherwood generator pumps

Often sold as part of Sherwood kit 10077K

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Serial Number Fitment Notice

Fitment depends on:

• Generator model
• Pump type
• Shaft configuration (keyed shaft required)

Always confirm compatibility using your generator model and serial number before ordering.

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Impeller Specifications (Fitment Critical)

• Diameter: 2-1/4″ (57 mm)
• Width: 25/32″ (≈20 mm)
• Shaft: 1/2″ (12.7 mm) keyed
• Keyway: 3/32″
• Blade Count: 12 blades
• Material: Marine-grade neoprene

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What’s Included

• Impeller only (service kits include gasket/O-ring separately)

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When This Part Needs Replacement

Replace the impeller if you notice:

• Generator overheating
• Reduced or no cooling water discharge
• Cracked or missing vanes
• Poor generator performance under load

Recommended service interval: every 100 hours or annually

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Installation Notes

• Lubricate impeller before installation
• Ensure key is properly seated
• Install with correct vane direction
• Inspect pump housing and wear plate
• Replace gaskets if removed

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Alternate / Superseded Part Numbers

OEM Cross References

• Onan: 132-0498

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Major Cross References

• Sherwood: 10077 / 10077K / S10077K
• Onan: 132-0375, 132-0379

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Aftermarket Cross References

• Sierra: 23-3310
• JMP: 7110
• Mallory: 9-45716

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Shipping

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

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Parts Desk Insight

If you’re servicing an Onan generator, this impeller and the Sherwood 10077K kit are essentially the same fitment—just decide if you need seals and gaskets at the same time