Description

The Sherwood 10077K Impeller Kit is a complete raw water pump service kit designed for Sherwood pump systems used in marine engines and generators. This kit includes a precision-molded neoprene impeller along with gaskets and an O-ring to restore proper cooling system performance and ensure reliable water circulation.

Constructed with a marine-grade neoprene impeller and a brass hub with a keyed drive, this kit provides durability and consistent performance in both freshwater and saltwater environments. Replacing a worn impeller helps maintain proper engine temperature and prevents overheating or internal damage.

This is a very common small-frame Sherwood impeller, widely used in gas inboards, classic marine engines, and Onan marine generators.

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Key Features

• Genuine Sherwood impeller service kit
• Marine-grade neoprene rubber construction
• 12-blade flexible impeller design
• Brass hub with keyed drive (3/32″ keyway)
• Includes gasket(s) and O-ring
• OEM-spec fit and performance

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Engine Compatibility

Onan Marine Generators

Common applications include:

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

Typically 6.5–10kW marine generator systems

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Chris-Craft Marine Engines

• Model 283
• Model 430
• Model B

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Gray Marine Engines

• Government / industrial marine engines

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Westerbeke Marine Engines

• Various 4 & 6 cylinder diesel engines
• Pilot and generator applications

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Universal / Palmer / Medalist Engines

• Universal marine engines
• Palmer I.H. series
• Medalist OK / OL engines

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Sherwood Pump Compatibility (Primary Fitment)

Fits a wide range of Sherwood pumps, including:

• R30G / R30G-1-01
• G701 / G701-01
• G702 / G702-01
• H70 / H80
• M10095G
• M10261G
• N10360GX
• Q10805G
• Q10840
• E05 / E20
• A03 / A20

Some pump systems use two 10077K impellers (dual impeller setups)

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Serial Number Fitment Notice

Fitment depends on:

• Pump model
• Shaft size (1/2″ keyed shaft required)
• Engine or generator application

Always confirm compatibility using your pump model or engine 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 in the Kit

• Impeller
• Gaskets (typically 2–3 depending on version)
• O-ring

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When This Part Needs Replacement

Replace the impeller if you notice:

• Reduced or no cooling water flow
• Engine or generator overheating
• Cracked, missing, or stiff vanes
• Reduced performance under load

Recommended service interval: every 100 hours or annually

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Installation Notes

• Lubricate impeller before installation
• Install with correct vane direction
• Ensure key is properly seated
• Replace all included gaskets and O-rings
• Inspect pump housing for wear

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Alternate / Superseded Part Numbers

OEM Cross References

• Sherwood: 10077K / 10077K-SHW

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Major Cross References

• Onan: 132-0375, 132-0379, 132-0498, 541-1519
• Westerbeke: 11764, 33100, 33112
• Universal: 287439
• Crusader: 727103
• Chris Craft: 16.80-90047

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Aftermarket Cross References

• Sierra: 23-3310 / 23-3302 / 23-2000
• JMP: 7110 / 7110-01K
• CEF: 500166
• 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

The 10077K is one of the most common small-frame Sherwood impellers, especially on generators. The key identifier is the 1/2″ keyed shaft + 2-1/4″ diameter—that combo makes it easy to separate from 10615K