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Description
Major Rebuild Kit – Fits Yanmar 2GM, 3GM Series (Replaces 128377-42500, 128397-42500)Major Rebuild Kit Fits Yanmar 2GM, 3GM Series (Replaces 128377 42500, 128397 42500) This high quality sea water pump major rebuild kit is designed for specific Yanmar marine diesel engines. It is engineered to fit the GM YEU European built series manufactured between 1996 and 2004, which are identifiable by an E prefix serial number. This kit serves as a direct replacement for several Yanmar and Johnson part numbers, ensuring a precise fit and
Major Rebuild Kit – Fits Yanmar 2GM, 3GM Series (Replaces 128377-42500, 128397-42500)
This high-quality sea water pump major rebuild kit is designed for specific Yanmar marine diesel engines. It is engineered to fit the GM-YEU European-built series manufactured between 1996 and 2004, which are identifiable by an E-prefix serial number.
This kit serves as a direct replacement for several Yanmar and Johnson part numbers, ensuring a precise fit and reliable performance for compatible sea water pumps.
- Installation: Direct OEM-style replacement for a straightforward installation.
- Compatibility: Designed specifically for pumps with a 6-bolt cover measuring 76mm (3") in diameter.
- Complete Kit: Includes all necessary components for a major overhaul, such as the impeller, bearings, seals, O-rings, and end cover.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Yanmar | 128377-42500 |
| Yanmar | 128397-42500 |
| Yanmar | 128990-42500 |
| Yanmar | 128990-42510 |
| Johnson | 10-24509-01 |
| Johnson | 10-24509-02 |
| Johnson | 10-13337-01 |
| Johnson | 10-13492-01 |
| Johnson | 10-13328-03 (Reference) |
Compatible Engine Models
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yanmar | 2GM20-YEU | 20 | 4-Stroke | 1996-2004 | 128377-42500 | E-prefix serial number |
| Yanmar | 2GM20C-YEU | 20 | 4-Stroke | 1996-2004 | 128377-42500 | E-prefix serial number |
| Yanmar | 3GM30-YEU | 30 | 4-Stroke | 1996-2004 | 128377-42500 | E-prefix serial number |
| Yanmar | 3GM30C-YEU | 30 | 4-Stroke | 1996-2004 | 128377-42500 | E-prefix serial number |
| Yanmar | 3GM30F-YEU | 30 | 4-Stroke | 1996-2004 | 128377-42500 | E-prefix serial number |
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Sea Water Pump Major Rebuild Kit |
| Installation | Direct OEM Replacement |
| Fuel Type | Diesel |
| Connection | Direct Mount |
| Housing Color | Black |
| Dimensions | Kit fits 6-bolt cover with 76mm (3") diameter |
| Other Technical Attributes | Impeller: 2" (50.8mm) diameter, 0.87" (22mm) width, 0.47" (12mm) shaft, 6 blades |
Package Contents
- 1 x Water Pump Impeller (128991-42200/128990-42200)
- 1 x Pump End Cover O-ring (X02173476)
- 1 x Slinger O-ring (X02173432)
- 1 x Retaining Ring (X00370012)
- 1 x Retaining Ring (X00371732)
- 1 x Spacer Plate (X0145050)
- 1 x Bearing (X03431760)
- 1 x Bearing (X03431748)
- 1 x SS Screws Set (X0504163)
- 1 x Lip Seal (X02233010)
- 1 x End Cover (X0142398/128990-42540)
Installation Guide
- Safety First: Before starting, ensure the engine is off and cool. Close the sea cock to prevent water from entering the boat.
- Access the Pump: Locate the sea water pump on the engine and remove any guards or hoses blocking access. Place a rag underneath to catch any spilled coolant.
- Remove the Old Pump Cover: Unscrew the six bolts holding the end cover in place. Carefully pry off the cover.
- Extract the Old Impeller: Using pliers or an impeller puller tool, remove the old impeller from the pump housing.
- Disassemble the Pump: Remove the retaining rings, bearings, and seals from the pump housing. Note their orientation for reassembly.
- Clean and Inspect: Thoroughly clean the pump housing, cover, and all contact surfaces. Inspect for any cracks, scoring, or excessive wear.
- Install New Components: Install the new bearings, lip seal, and retaining rings from the kit in the reverse order of disassembly.
- Install the New Impeller: Lightly lubricate the new impeller and housing interior with a suitable marine lubricant. Insert the new impeller, bending the blades in the correct rotational direction.
- Install the New Cover: Place the new gaskets/O-rings and install the new end cover. Secure it with the new stainless steel screws, tightening them in a star pattern to ensure an even seal.
- Final Checks: Reconnect all hoses. Open the sea cock. Start the engine and immediately check for any leaks around the pump.
Troubleshooting & FAQ
Q: How do I confirm this kit fits my engine?
A: This kit is specifically for the European-built Yanmar 2GM-YEU and 3GM-YEU series engines manufactured between 1996 and 2004. A key identifier is an "E" prefix on your engine's serial number. The pump this kit services has a 6-bolt cover with a 76mm (3") diameter. Please verify these details against your engine and existing pump.
Q: Is this kit compatible with Japanese-built Yanmar GM engines?
A: No, this kit is designed exclusively for the European-built models (-YEU). The pumps on Japanese-built models are different. Please double-check your engine's model and serial number before ordering.
Q: What are common signs that my sea water pump needs a rebuild?
A: Common signs of failure include the engine overheating at idle or low speeds, visible water leaks from the pump itself (weep holes), reduced water flow from the exhaust, or a damaged or brittle impeller found during routine inspection. It is recommended to inspect your impeller annually and replace it as a preventative measure.
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:
- 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
4.2 ★★★★★
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Product Reviews
★★★★★ 5
Chelsea Market Manhattan.
Style: 1 to 10 IR Repeater, Style: 1 to 10 IR Repeater
When used correctly under the correct conditions these work wonderfully.
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Reviewed in the United States on April 24, 2026
★★★★★ 5
Magical TV Backlight With Amazingly Accurate and Vivid Colors
Size: 7.8FT for 40''-50'' TV, Size: 7.8FT for 40''-50'' TV
I had very high expectations for this Govee 3 Lite backlight and it surpassed all of them by a mile. This Govee 3 Lite with proper set up, calibration and correct settings looks absolutely magnificent with beautiful and accurate colors that it adds so much to my TV viewing experience.
Most of the "bad" reviews on here is USER ERROR because the person can't bother to do even the most basic research therefore he/she doesn't know how to set it up, calibrate and adjust settings correctly.
So here are some tips and settings that may help others:
For accurate colors it's vital to set your white light accurately first since all other colors blend off of white.
Also, ALL of your TV SETTINGS like BRIGHTNESS, COLOR TEMPERATURE, PICTURE MODE, COLOR, CONTRAST, etc. has an impact on the LED strip brightness, vividness, accuracy and density as well. So play around and pause a scene on your TV that's really colorful and then turn your individual TV settings all the way up and all the way down to see how it affects your Govee lights.
Now I have an LG OLED and OLED's have perfect black levels and near perfect colors out of the box, so you may not get the exact results I did. But it doesn't hurt to give it a try and see if it helps your Govee set up if you are not satisfied with your colors.
1. Put the camera dead center of your TV and at 90 degrees (or as close as you can).
2. Install the light strip as close as you possibly can to the edge of your TV. I've seen youtube videos where people install them 2" to 3" inward from the edge (I get it if you have no choice because your back panel has a weird shape or is not completely flat along the edges) and that gives such a tiny light spread on the wall and also leads to dead spots in the corners because the light is set too far away and that causes the TV's corners to cast a shadow on the wall leaving a dead spot.
3. When you calibrate with the orange squares make sure the gray box ends up looking either like a rectangle or a bow tie. I added pictures of my actual calibrations of both shapes to my review to give you an idea of what I'm talking about. If your TV is wall mounted or on a TV stand where there's nothing underneath the camera that may interfere with it, I'd probably go with a rectangle shape which is the ideal shape according to Govee. But after playing around with the calibration I discovered that for my set up a bow tie shape gives me the most accurate and uniform colors because I have a semi-glossy TV stand and it helps to prevent the camera from seeing past the bottom edge of my TV and catching whatever colors that are reflecting back up off my TV stand so it doesn't interfere with the actual colors coming from my screen.
4. When you adjust the "color calibration, saturation, white balance, etc." in the app do it in a dark room.
4a. "Saturation" setting needs to be dropped way down to give you accurate colors. I keep mine between 1%-5%. If you're one of many people that's having problems with your white light looking green, dropping the saturation down a lot should fix that problem and give you a nice white light that will go a long way in giving you accurate colors across the board.
5. "White balance" default is 50% but it looks a little too blue on my LG OLED so I keep my white balance a little more on the red side at 70%-75% and I get a nice slightly warmer white that works wonders in getting accurate colors all around. Google "pure white" background and use that to adjust your white balance and saturation.
6. "Relative Brightness" default is 50%. I set mine all the way up to 100% on all four sides and then I control the brightness level with the main brightness slider which when it's a bright room I set it to 100% and when it's a dark room I set it to 47% because that's the percentage I found that when the screen or parts of the screen goes dark so do the corresponding lights which only adds to the immersive viewing experience.
7. If you want your lights to show all the different colors as you watch TV you need to choose "part" in the app. If you choose "whole" you will get only solid colors on all four sides.
8. You can choose either "movie" or "game" but personally I leave mine to "movie" 90% of the time even if I'm gaming. The difference between them is with "game" the colors switch a little faster but that leads to a lot more flickering which can be very distracting. With "movie" it's a softer and smoother transition.
9. I love that I can connect my Govee kit to my Alexa app by adding it in the "skills" section which allows me to control the backlight with voice commands for things like turning the LED strip on and off or the brightness up or down or setting a timer/routine to turn the LED strip on or off at a certain time of day I set.
Thankfully I had a few weeks to do a lot of research and also check out youtube videos before Prime Day when I was able to purchase this kit for $46 for the 40"-50" size.
And it was in doing this research that made my set up super easy with no problems at all when my kit arrived. All told it took me about two hours from start to finish to install and set up my backlight settings to get it perfect for my LG OLED TV.
It took me longer than most people since I went all OCD when figuring out the exact placement, spacing, height and measurements of the lights to get the best possible light spread on my wall and it was all worth it since my LED's look fantastic because I have a full and wide light spread and the colors are so evenly dense with no dead spots in the corners like I've seen on so many other set ups.
I was worried that the whole calibration thing would be a PITA since a lot of reviewers seem to struggle mightily with getting it right. For me, it was super simple because through my research I learned what not to do and avoided all the pitfalls that plague others.
The proof is in the pudding. I've added screenshots of the settings I use and a sample video with those settings and my lights are mesmerizing and gorgeous. Check it out!
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Reviewed in the United States on October 10, 2025
★★★★★ 5
Probably the best available for the money
Size: 11.8FT for 55''-65'' TV, Size: 11.8FT for 55''-65'' TV
I love these lights. High-quality dynamic backlighting for your TV. With the calibration and settings dialed correctly, it moves and breathes smoothly with the picture as you use the screen. With this installed it really amps up the cozy and artsy vibes of the screen, adding further immersion. It's also easier on your eyes in a dark room to add backlighting.
You can set the brightness level to the level you want, and you can fully control the colors and tone, whether you want to set it to something static, add a colored border, or use the dynamic lighting (which is what I'm currently using). These lights were made for 55 inch to 65 inch TVs. There are four strips rolled up, two for the short side and two for the long side. No matter which corner you start from, you will be able to set it up properly during calibration. The strips stuck well so far but were not so firm that I couldn't pull up one strip to reapply it.
The TV I have here in the pictures is the Sony Bravia ii OLED 4K panel (~$2000 screen, excellent picture quality for the price point). I am using a Rocketfish omnidirectional wall mount behind it.
TIPS
I followed some other reviews here for the calibration. It was recommended to set the TV brightness to max for calibration, then adjust both TV and backlight brightness after setup.
The physical setup only required me to have a TV pulled forward from the wall a foot or so, plus a 3-step ladder so I could easily reach the top of the TV. You could absolutely install this on a TV sitting a bit forward on a stand as well.
App setup was a breeze once the lights and camera were attached properly. I will sort out my cable management eventually, once I have a TV shelf installed below my panel which is my next goal for this room.
The kit comes with some additional adhesive to secure the lights that I didn't end up using, as the adhesive on the back of the light strips was sufficient for now. I'm saving the extra parts just in case.
Overall I highly recommend it! The dynamic lighting adds so much immersion without being loud or flashy unless you want it to be. Kinda just blends into the background and subtly amps up the quality of your whole experience. Like the color on the picture just blends seamlessly into the wall and the room.
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Reviewed in the United States on December 19, 2025
★★★★★ 5
Best lights out there
Size: 11.8FT for 55''-65'' TV
absolutely love it makes the colors stand out just so much more makes movies so much more immersing and the sound reaction makes you feel like your almost inside the movie if you have dolby atmos speakers (8d) and the app is so simple and easy all their products including this are just efficient and useful and one of my favorite parts about the app is the upload center you can use other people’s led light settings if they publish it and definitely the video capturing the camera does not have a adhesive by the way but it is definitely stable the led lights adhesive is very good re taped it after the first time because it was a little croooked and the adhesive was still really good i haven’t had any issues in the past 2 ish months the app is very smart the timer works just on point the brightness is amazing if it doesn’t feel like it just wait till the room is pitch black and lastly the apps control is great so simple and effective just not doing too much you know
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Reviewed in the United States on May 30, 2026
★★★★★ 4
An effective TV watching enhancement
Size: 7.8FT for 40''-50'' TV
The Govee TV Backlight 3 Lite transformed my TV-watching experience. Installation was quick, the adhesive holds well, and the calibration process is a little tricky and will take time to get right, from mapping out the TV size to setting the light quality up within the app. But the light quality is good and works best in rooms which are very dark with no external light sources to influence the color the camera picks up.
The ambient lighting makes movies and gaming feel more immersive without being distracting. The app controls are intuitive, and the customization options let you fine‑tune everything from brightness to color modes.
If you want an easy, affordable way to elevate your TV experience, this backlight delivers as promised.
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Reviewed in the United States on January 7, 2026
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