SKU: 78194213429

Impeller Kit – Fits Westerbeke Generators (Replaces 33112)

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Description

Impeller Kit – Fits Westerbeke Generators (Replaces 33112)Impeller Kit Fits Westerbeke Generators (Replaces 33112) This impeller kit is designed for a wide range of Westerbeke marine generators, including models from 6. 5 kW to 20. 0 kW. It directly replaces OEM part number 33112, but compatibility can vary based on the specific generator's configuration (60Hz vs. 50Hz models) and the existing raw water pump installed. It serves as a direct cross reference for several other aftermarket and OEM part numbers,

Impeller Kit – Fits Westerbeke Generators (Replaces 33112)

This impeller kit is designed for a wide range of Westerbeke marine generators, including models from 6.5 kW to 20.0 kW. It directly replaces OEM part number 33112, but compatibility can vary based on the specific generator's configuration (60Hz vs. 50Hz models) and the existing raw water pump installed.

It serves as a direct cross-reference for several other aftermarket and OEM part numbers, ensuring broad compatibility. Please consult the cross-reference table and compatible models list to ensure proper fitment.

  • Direct replacement for simplified installation.
  • Includes one impeller and a variety of gaskets and an O-ring to service multiple pump variations.
  • Constructed from durable neoprene with a brass insert for reliable performance in marine environments.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Brand Part Number
Westerbeke 33112
Westerbeke 11764
Westerbeke 33100
Sierra 23-3302
Sierra 23-2000
Sierra 23-3310
JMP 7110-01K
Sherwood 10077 / 10077K
Onan 132-0375 / 132-0379 / 132-0498 / 541-1519
Crusader 727103
Chris Craft 16.80-90047
Universal 287439

Compatible Generator Models

Confirm your engine model/year in the table below.

Brand Model Rated Output Frequency OEM Part No. Notes
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

Specification Value
Product Type Marine Generator Impeller Kit
Installation Direct OEM replacement
Connection Key Drive
Housing Material Neoprene (impeller) with Brass insert
Housing Color Black
Dimensions 57mm diameter × 20mm width (impeller)
Weight 0.14 kg (0.30 lbs) approx. (impeller only)
Fitting Type Key Drive Impeller
Warranty 1 year manufacturer warranty (JMP); Sierra lifetime warranty on materials and workmanship
Other Technical Attributes 12 impeller blades; 12.7mm (1/2") shaft diameter

Package Contents

  • 1 x Impeller (Replaces Westerbeke 33112)
  • 1 x Gasket (GAK0041)
  • 1 x Gasket (GAK0042)
  • 1 x Gasket (GAK0043)
  • 1 x O-Ring (ORG0040)

Note: Some applications may not require all items included in the kit.

Installation Guide

Professional installation is recommended. The following is a general guide:

  1. Shut off the seacock and disconnect power to the generator.
  2. Place an absorbent pad under the raw water pump to catch spills.
  3. Loosen and remove the screws on the pump's faceplate/cover.
  4. Gently pry off the cover. Be careful not to damage the housing or cover.
  5. Using impeller pullers or two flat-head screwdrivers, carefully grip and pull the old impeller straight out of the pump housing.
  6. Clean the interior of the pump housing and inspect for scoring or debris.
  7. Lubricate the new impeller and the inside of the pump housing with a water-based lubricant or glycerine.
  8. Install the new impeller by pushing it into the housing while turning the shaft to bend the blades in the correct direction.
  9. Clean the cover plate and install the correct new gasket or O-ring for your pump model.
  10. Re-attach the cover plate, tightening the screws in a star pattern to ensure an even seal.
  11. Open the seacock, restore power, and start the generator. Immediately check for water leaks and verify proper water flow from the exhaust.

Troubleshooting & FAQ

Q: How do I know if this impeller fits my Westerbeke generator?

A: This kit is designed for a wide range of Westerbeke generators from 6.5 kW to 20.0 kW. The best way to confirm fitment is by matching your generator's OEM part number (33112) with our cross-reference list. Additionally, verify your model is listed in the compatible models table on this page.

Q: What are the signs that my impeller needs replacing?

A: The most common signs of a failing impeller are generator overheating, a noticeable reduction in water flow from the exhaust outlet, or visible damage such as cracks, missing blades, or brittle rubber found during inspection.

Q: How often should I replace my generator's impeller?

A: As a crucial part of preventative maintenance, you should inspect the impeller annually and plan to replace it every 1-2 years. The replacement interval depends heavily on usage hours, water conditions (sandy/silty water causes faster wear), and periods of disuse.

Q: OEM vs. Aftermarket?

A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?

A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?

A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

  • Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
  • This product is an aftermarket replacement part and is not an OEM component.
  • Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

  • Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
  • Fast Global Shipping: Free delivery worldwide in 5–15 days.
  • Direct from Manufacturer: Competitive pricing without compromising quality.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 78194213429

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Taylor McDevitt
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★★★★★ 4
Does it's purpose with style
We used these in our pantry and dining room for shelves and they turned out well. The only reason they are hard to install is because of the design (which is very nice) so it is worth it. It just takes time when you you are hanging the shelves, to do it correctly. While they can hold a lot, we realized that a bunch of cans or jars cannot go on these shelves. Luckily we had another option for heavy items (Example: We had about 40ish pounds of cans/jars on a 1x12 board that is 33 inches long with 2 of these brackets...and it was too much). If you do not need to hold a lot of weight, these shelves are a for sure, for the price and quality. If you NEED they for something heavy, then you probably will have to go with something more practical from a hardware store. We LOVE them for our pantry!
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Reviewed in the United States on March 28, 2020
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FredsMyth
Bozeman, US
★★★★★ 5
Worked as intended
Hubby used these to mount a shelf above a long span of windows. They worked great and allowed a clean visual appearance.
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Reviewed in the United States on December 7, 2025
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Amazon Customer
Charlottesville, US
★★★★★ 5
Nice brackets
These are nice sturdy brackets for butcher block shelf however they do bend a bit. We installed in a corner so was able to pin to side wall no problems on big shelf. The smaller shelf about 18” moves a bit up and down when loading. Now very little and no worries about it but not rock solid
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Reviewed in the United States on January 20, 2024
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PK
Waukegan, US
★★★★★ 5
Easiest shelf brackets ever!
Live these! They were great look good and we’re easy to install
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Reviewed in the United States on December 12, 2025
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Calichef
Lexington, US
★★★★★ 5
Sturdy Shelf Brackets
I really like these shelf brackets. They seem very sturdy, which is great for my laundry room shelves over the washer & dryer pair. It's going to be great to FINALLY have shelves for laundry supplies or "buyers' club" household items like 12-packs of paper towels or 36-packs of T.P. I can hardly wait to have my sons install them so I can fill them up!
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Reviewed in the United States on August 13, 2023

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