Onan 132-0498 Generator Impeller
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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.
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
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
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
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.
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
What’s Included
- Impeller only (service kits include gasket/O-ring separately)
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
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
Alternate / Superseded Part Numbers
OEM Cross References
- Onan: 132-0498
Major Cross References
- Sherwood: 10077 / 10077K / S10077K
- Onan: 132-0375, 132-0379
Aftermarket Cross References
- Sierra: 23-3310
- JMP: 7110
- Mallory: 9-45716
Shipping
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
💡 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 👍
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.