Impeller Kit for Westerbeke Generators – Replaces 33112
Impeller Kit for Westerbeke Generators – Replaces 33112 is backordered and will ship as soon as it is back in stock.
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Impeller Kit for Westerbeke Generators – Replaces 33112
Impeller Kit for Westerbeke Generators – Replaces 33112 is backordered and will ship as soon as it is back in stock.
Product Details
This Impeller Kit for Westerbeke Generators is intended as a replacement for applications using Westerbeke reference 33112. It is designed to restore raw-water flow through the seawater pump and support reliable engine cooling on compatible marine generator configurations.
Reference numbers associated with this impeller application include Sierra 23-3302, JMP 7110-01K, Sherwood 10077 and 10077K, Onan 132-0375, 132-0379, 132-0498 and 541-1519, Westerbeke 11764, 33100 and 33112, Crusader 727103, Chris Craft 16.80-90047, and Universal 287439. Confirm the reference number, pump configuration, dimensions and key arrangement before ordering.
- Replacement impeller kit for compatible marine generator seawater pumps.
- Neoprene impeller with a brass insert and key-drive connection.
- Includes one impeller, three gaskets and one O-ring for servicing multiple pump configurations.
Part Number Matrix
The references below are provided for identification and cross-reference purposes. Verify your original part and pump configuration before installation.
| Brand | Part Number |
|---|---|
| Sierra | 23-3302 |
| Sierra | 23-2000 |
| Sierra | 23-3310 |
| JMP | 7110-01K |
| Sherwood | 10077 |
| Sherwood | 10077K |
| Onan | 132-0375 |
| Onan | 132-0379 |
| Onan | 132-0498 |
| Onan | 541-1519 |
| Westerbeke | 11764 |
| Westerbeke | 33100 |
| Westerbeke | 33112 |
| Crusader | 727103 |
| Chris Craft | 16.80-90047 |
| Universal | 287439 |
Engine & Model Compatibility
The following Westerbeke generator configurations are associated with this application. Because generator versions can vary by frequency and pump configuration, compare the existing impeller and pump specifications before purchase.
| Brand | Model | Rated Output | Frequency | Reference No. |
|---|---|---|---|---|
| Westerbeke | 6.5 TWG | 6.5 kW / 4.9 kW | 60Hz / 50Hz | 33112 |
| Westerbeke | 8.0 TWG | 8.0 kW / 6.4 kW | 60Hz / 50Hz | 33112 |
| Westerbeke | 8.5 BTG | 8.5 kW / 6.5 kW | 60Hz / 50Hz | 33112 |
| Westerbeke | 8.5 BTGA | 8.5 kW / 6.8 kW | 60Hz / 50Hz | 33112 |
| Westerbeke | 11.0 TWG | 11.0 kW / 8.5 kW | 60Hz / 50Hz | 33112 |
| Westerbeke | 12.5 BTG | 12.5 kW / 10.0 kW | 60Hz / 50Hz | 33112 |
| Westerbeke | 15.0 BTG/A | 15.0 kW / 12.0 kW | 60Hz / 50Hz | 33112 |
| Westerbeke | 20.0 WTA | 20.0 kW / 16.0 kW | 60Hz / 50Hz | 33112 |
Technical Specifications
- Product Type
- Marine generator impeller kit
- Installation
- Replacement installation for compatible seawater pumps
- Drive Connection
- Key drive
- Impeller Material
- Neoprene with brass insert
- Impeller Color
- Black
- Impeller Dimensions
- 57 mm diameter × 20 mm width
- Impeller Weight
- Approximately 0.14 kg (0.30 lb)
- Blade Count
- 12 blades
- Nominal Shaft Diameter
- 12.7 mm (1/2 in)
What’s in the Box
- 1 × neoprene impeller for applications referencing Westerbeke 33112
- 1 × gasket, GAK0041
- 1 × gasket, GAK0042
- 1 × gasket, GAK0043
- 1 × O-ring, ORG0040
Note: Not every application uses every gasket or the O-ring included in the kit. Select the sealing component that matches the pump being serviced.
Installation Notes
- Close the raw-water intake seacock before beginning work.
- Locate and access the seawater pump on the generator.
- Remove the pump faceplate screws and cover to expose the old impeller.
- Remove the old impeller with suitable pliers or an impeller puller, and note the installed blade direction.
- Clean the pump housing and faceplate, removing old gasket material and debris.
- Choose and install the gasket that matches the pump configuration.
- Lightly lubricate the pump housing and new impeller with a water-based lubricant or glycerine.
- Insert the impeller with a twisting motion, ensuring that the key engages correctly and the blades are oriented for the pump rotation.
- Reinstall the faceplate and tighten the screws evenly.
- Open the raw-water seacock.
- Start the generator and check for proper exhaust-water flow and leaks around the pump cover.
Troubleshooting & FAQ
How do I confirm that this kit fits my generator?
Compare your generator model, frequency, pump configuration, existing impeller dimensions, key arrangement and reference number with the information on this page. The listed Westerbeke models and reference numbers are application leads; verify the original part before ordering.
What are the signs of a failing impeller?
Common symptoms include higher-than-normal operating temperature, a low raw-water-flow alarm, reduced exhaust-water flow, or visible cracking, brittleness, distortion or missing blades on the old impeller.
How often should the impeller be replaced?
Inspect the impeller at the interval specified by the generator manufacturer. Many operators inspect it annually and replace it based on condition, operating hours and water conditions, especially where sand or silt is present.
Why are multiple gaskets and an O-ring included?
The kit is intended for more than one compatible pump configuration. Different pumps may use different gasket shapes or an O-ring. Match the new seal to the component removed from your pump; some pieces may remain unused.
Can I install the kit myself?
Impeller replacement is a routine maintenance task for an experienced boat owner with the correct tools. If you are unfamiliar with seawater-pump service, have the work performed by a qualified marine technician.
What happens if the impeller blades are installed in the wrong direction?
The blades generally conform to the pump rotation during operation, but they should be installed in the direction of rotation when possible. Confirm the pump manufacturer's service instructions and ensure the impeller is fully seated on the keyed shaft.
Is this an OEM part?
This listing is for an aftermarket replacement kit. The reference numbers are provided for application and identification purposes and should not be interpreted as a claim that the kit is manufactured by the listed engine or part-number brands.
What should I check before starting the generator?
Confirm that the impeller is seated, the key is installed, the correct gasket is fitted, the faceplate is secure, the seacock is open and the pump area is free of leaks. Check raw-water flow immediately after startup.
Safety & Important Information
- Shut down the generator and close the raw-water intake before servicing the pump.
- Verify the original impeller dimensions, key arrangement, pump configuration and reference number before ordering.
- Do not operate the generator without confirming adequate raw-water flow.
- This is an aftermarket replacement kit, not an OEM component.
- Professional installation is recommended when the correct application or installation procedure is uncertain.
About Sea Sierra
- Marine Replacement Parts — We supply replacement components for marine maintenance and repair applications.
- Application-Focused Information — Product references and compatibility details are provided to help you compare the replacement with your original part.
- Support for Maintenance Projects — Review the specifications carefully and contact support if you need help comparing an application.
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