Sierra 223-3302 Impeller Kit for Westerbeke 33112 Marine Generators, White

The Sierra 223-3302 Impeller Kit is a replacement raw water pump impeller kit built for Westerbeke marine generator sets. It is designed to restore proper raw water circulation through the generator's cooling system, a critical function for preventing overheating during operation. The kit corresponds to Westerbeke part number 33112 and is intended as a direct service replacement for that application.

The impeller itself is molded in white material sized to fit the raw water pump housing used across a range of Westerbeke generator models spanning multiple output ratings, including TWG, BTG, BTG/A, BTGA, and WTA series units rated for both 60Hz and 50Hz operation. Because generator raw water pumps rely on flexible impeller vanes to move cooling water, this component wears over time and periodic replacement is part of routine generator maintenance to keep cooling performance reliable.

This is a single-item kit (one impeller per package) sold as a standalone service part. Sierra engineers its impellers to meet or exceed the specifications of the original equipment part being replaced, so the 223-3302 is built to perform to the same fit and function as the Westerbeke component it services.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 223-3302
• Category: Westerbeke Generator Parts
• Product Type: Impeller Kit
• Color: White
• Weight: 0.1 pounds
• Number of Items: 1
• UPC: 808282288518
• Compatible Generator Models: 11.0 TWG (60Hz) / 8.5 TWG (50Hz), 12.5 BTG (60Hz) / 10.0 BTG (50Hz), 15.0 BTG/A (60Hz) / 12.0 BTG/A (50Hz), 20.0 WTA (60Hz) / 16.0 WTA (50Hz), 6.5 TWG (60Hz) / 4.9 TWG (50Hz), 8.0 TWG (60Hz) / 6.4 TWG (50Hz), 8.5 BTG (60Hz) / 6.5 BTG (50Hz), 8.5 BTGA (60Hz) / 6.8 BTGA (50Hz)

Fitment

• Westerbeke 11.0 TWG (60Hz) / 8.5 TWG (50Hz)
• Westerbeke 12.5 BTG (60Hz) / 10.0 BTG (50Hz)
• Westerbeke 15.0 BTG/A (60Hz) / 12.0 BTG/A (50Hz)
• Westerbeke 20.0 WTA (60Hz) / 16.0 WTA (50Hz)
• Westerbeke 6.5 TWG (60Hz) / 4.9 TWG (50Hz)
• Westerbeke 8.0 TWG (60Hz) / 6.4 TWG (50Hz)
• Westerbeke 8.5 BTG (60Hz) / 6.5 BTG (50Hz)
• Westerbeke 8.5 BTGA (60Hz) / 6.8 BTGA (50Hz)

Replaces (OEM)

• Westerbeke 33112

Frequently Asked Questions

What does the Sierra 223-3302 impeller kit fit? The 223-3302 is built for Westerbeke marine generators, covering the TWG, BTG, BTG/A, BTGA, and WTA model lines in both 60Hz and 50Hz configurations, corresponding to Westerbeke part number 33112.

Is this the same part as Westerbeke 33112? Yes, the Sierra 223-3302 is the cross-reference replacement for Westerbeke part number 33112 and is built to the same fit and function as that original component.

What color is the 223-3302 impeller? It is white, which is the standard color for this Sierra impeller kit.

How much does the impeller kit weigh? The Sierra 223-3302 impeller kit weighs 0.1 pounds.

How many impellers come in the kit? The kit includes one impeller as a single-item package, part number 223-3302.

Will the 223-3302 work on a 50Hz generator? Yes, the compatible Westerbeke models are listed for both 60Hz and 50Hz operation, for example 11.0 TWG (60Hz) and its 8.5 TWG (50Hz) counterpart.

Why does a generator impeller need to be replaced? The impeller drives raw water circulation through the generator's cooling system, and its flexible vanes wear down over time, so periodic replacement with a part like the Sierra 223-3302 keeps cooling performance reliable and helps prevent overheating.

Is the Sierra 223-3302 an OEM part or aftermarket? It is a Sierra aftermarket impeller engineered to meet or exceed the specifications of the original Westerbeke 33112 part it replaces.

Does the 223-3302 fit the BTG/A and BTGA generator models the same way? Both are covered: the kit fits the 15.0 BTG/A (60Hz)/12.0 BTG/A (50Hz) models as well as the 8.5 BTGA (60Hz)/6.8 BTGA (50Hz) model, listed as distinct generator designations.

What is included when I order this part? The order includes one Sierra 223-3302 impeller, packaged as a single kit item.