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Description
Water Pump Impeller Kit – Fits MerCruiser Alpha One Gen 2 & Mercury Marine 200-250 HP Outboards (Replaces 817275A5, 817275Q05)Water Pump Impeller Kit Fits MerCruiser Alpha One Gen 2 & Mercury Marine 200 250 HP Outboards This water pump impeller kit is a direct replacement for MerCruiser Alpha One Gen 2 stern drives (1991 present) and Mercury Mariner 3. 0L V6 outboards (200250 HP). It provides a complete assembly for servicing or rebuilding the lower unit water pump. It is designed to replace Mercury Marine part number 817275A5 and MerCruiser part numbers 817275K05,
Water Pump Impeller Kit – Fits MerCruiser Alpha One Gen 2 & Mercury Marine 200-250 HP Outboards
This water pump impeller kit is a direct replacement for MerCruiser Alpha One Gen 2 stern drives (1991-present) and Mercury/Mariner 3.0L V6 outboards (200–250 HP). It provides a complete assembly for servicing or rebuilding the lower unit water pump.
It is designed to replace Mercury Marine part number 817275A5 and MerCruiser part numbers 817275K05, 817275Q05, 817275A6, 817275A4, 817275T4, and 817275Q4.
- Installation: Vehicle-specific fit for listed models.
- Materials: Features a durable neoprene impeller, stainless steel housing, and non-asbestos gaskets for reliable, long-lasting performance.
- Complete Assembly: Includes all necessary seals, gaskets, O-rings, and hardware for a full replacement.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Mercury Marine | 817275A5 |
| MerCruiser | 817275K05 / 817275Q05 / 817275A6 / 817275A4 / 817275T4 / 817275Q4 |
| Sierra | 18-3147 |
| Mallory | 9-48315 |
Compatible Engine Models
Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.
Mercury Marine / Mariner
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury/Mariner | 200 DFI | 200 | 4-Stroke | Up to 2008 | 817275A5 | Serial: 0G590000-0T800999 |
| Mercury/Mariner | 200 DFI (3.0L) | 200 | 4-Stroke | Up to 2010 | 817275A5 | Serial: 0T801000-1B504988 |
| Mercury | 200 DFI (3.0L)(DTS) | 200 | 4-Stroke | Up to 2010 | 817275A5 | Serial: 0T980000-1B504988 |
| Mercury/Mariner | 200 EFI (3.0L) | 200 | 4-Stroke | Up to 2010 | 817275A5 | Serial: 0T750164-1B504988 |
| Mercury/Mariner | 225 Carb (3.0L) | 225 | 4-Stroke | Up to 2006 | 817275A5 | Serial: 0G760300-0T408999 |
| Mercury/Mariner | 225 DFI | 225 | 4-Stroke | Up to 2010 | 817275A5 | Serial: 0G590000-1B504988 |
| Mercury/Mariner | 225 DFI (3.0L) | 225 | 4-Stroke | Up to 2010 | 817275A5 | Serial: 0T801000-1B504988 |
| Mercury/Mariner | 225 DFI (3.0L)(DTS) | 225 | 4-Stroke | Up to 2010 | 817275A5 | Serial: 0T599000-1B504988 |
| Mercury/Mariner | 225 EFI (3.0L) | 225 | 4-Stroke | Up to 2010 | 817275A5 | Serial: 0G760300-1B504988 |
| Mercury/Mariner | 225 EFI (3.0L) Seapro/Marathon | 225 | 4-Stroke | Up to 2009 | 817275A5 | Serial: 0T801000-1B417701 |
| Mercury | 225 PRO XS DFI (3.0L) | 225 | 4-Stroke | Up to 2009 | 817275A5 | Serial: 1B104549-1B426560 |
| Mercury/Mariner | 225 Seapro/Marathon Carb (3.0L) | 225 | 4-Stroke | Up to 2006 | 817275A5 | Serial: 0G760300-0T408999 |
| Mercury/Mariner | 250 EFI (3.0L) | 250 | 4-Stroke | Up to 2010 | 817275A5 | Serial: 0G760300-1B504988 |
| Mercury | 250XB EFI (3.0L) | 250 | 4-Stroke | Up to 2008 | 817275A5 | Serial: 0G980600-0T800999 |
| Mercury/Mariner | 3.0L EFI Seapro/Marathon | 200-250 | 4-Stroke | Up to 2008 | 817275A5 | Serial: 0T409000-0T800999 |
MerCruiser
| Brand | Model | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|
| MerCruiser | Alpha One Gen 2 | 4-Stroke | 1991-Present | 817275K05/Q05 | Sterndrive application |
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Water Pump Impeller Kit with Housing |
| Installation | Vehicle-specific fit |
| Fuel Type | Gasoline |
| Housing Material | Stainless Steel Wear Plate and Housing |
| Impeller Material | Neoprene |
| Gasket Material | Non-asbestos |
| Weight | 0.72 kg (1.59 lb) |
| Other Technical Attributes | Includes complete water pump assembly parts |
Package Contents
- 1 x Carrier Seal (821759A4)
- 1 x Impeller (47-43026T2)
- 1 x Impeller Plate (8172761)
- 1 x Impeller Key (28-43037)
- 2 x O-Ring (25-21836)
- 1 x Seal Ring Gasket (26-45577B1)
- 1 x Face Seal and Tool (26-816575A2)
- 1 x Impeller Gasket (27-430331)
- 1 x Impeller Gasket (27-8172771)
- 1 x Drain Screw Gasket (12-191833)
Installation Guide
Warning: Ensure the engine is turned off and the battery is disconnected before beginning installation. Use caution as components may be hot.
- Disconnect the shift cable from the engine.
- Remove the bolts securing the lower unit (gearcase) to the upper driveshaft housing.
- Carefully lower the gearcase to access the water pump assembly. Be prepared for some gear lube to drain out.
- Remove the bolts holding the water pump housing cover in place.
- Remove the old impeller, gaskets, wear plate, and seals from the housing. Clean all surfaces thoroughly.
- Install the new wear plate and gaskets.
- Slide the new impeller into the housing. Turn the driveshaft clockwise to help seat the impeller vanes correctly.
- Apply a light coat of marine grease to the inside of the housing and on the new O-rings and seals before installation.
- Install the new seals and reassemble the pump housing, ensuring all bolts are torqued to manufacturer specifications.
- Reinstall the gearcase onto the driveshaft housing, making sure the driveshaft, water tube, and shift shaft align correctly.
- Secure the lower unit with the mounting bolts and reconnect the shift linkage.
- Test the engine using a water supply (flushing muffs) to confirm proper water flow from the tell-tale outlet.
Troubleshooting & FAQ
Q: How do I confirm this kit fits my specific engine?
A: The surest way is to match your engine's serial number to the ranges listed in the compatibility table. The serial number is typically found on a plate on the transom bracket. If you are unsure, use the serial number guide links provided above or consult your owner's manual.
Q: What are the signs of a failing water pump impeller?
A: Common symptoms include a weak or non-existent water stream from the "tell-tale" outlet, engine overheating alarms, and reduced engine performance. A visual inspection may reveal brittle, cracked, or missing impeller vanes.
Q: How often should the water pump impeller be replaced?
A: As a general rule, it's recommended to inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of use, depending on operating conditions (especially in saltwater or sandy/silty water).
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
4.1 ★★★★★
Based on 5 reviews
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Product Reviews
★★★★★ 5
Forget Adventurer 5M , This is the true and easy to use beginner machine
Set name: Ender 3 V3 SE
This is my 3rd 3d printer. Once I spent about 45 minutes assembling it has been printing nonstop since the amazon driver dropped it off, these are the best for reliability and perfect for hobbyists. It is not the quickest machine out there, but it makes up for it with a quality print good price as well.
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Reviewed in the United States on May 25, 2026
★★★★★ 4
One - Month Review
Set name: Ender 3 V3 SE, Set name: Ender 3 V3 SE
First - I wrote a out of the box review - I do not know if this review will replace the old review or compliment it. Just in case this review replaces the old review - I will repeat a few of the important points from the previous review.
I must also say it helps a great deal if you are already familiar with Ender because about 80% or more of the machine is built the same way as the older models. If this is your first Ender - read the instructions and check to make sure you have all the parts. Placing the parts where you can easily tear open the bags and not having to search for a part cuts down the assembly time. While the assembled printer takes up a small footprint - give yourself room to work.
This is my 3rd printer - my first one I made from scratch. It took about 2 weeks to get it assembled and another two weeks to get it to print properly. Most of that time was spent modifying the Martin software so it would run my machine!
My second one was an Ender V1. It took me about 90 minutes to assemble and about 30 minutes to get it to work. Over the years - I modified it to the point it was virtually impossible to tell the difference between it and a V3. I replaced it because a least one of the motors was going bad and I did not want to do the repairs.
I picked this printer for 3 reasons 1) it was on sale, 2) I am now wheelchair bound and needed a printer that did not require too much assembly, and 3) I had worked with Ender before and knew how they worked. I was able to keep some of the old parts from the old machine (but threw most away).
Everything was packaged well, but the small parts are in plastic bags that you have to tear or cut open - so be careful you do not lose any parts! There are only three parts to be assembled. They are the base, the frame, and the screen. I had no trouble getting the machine together - did have some trouble getting it to work. I was never able to reach customer service which ranged between "Who are you Kidding?" and "Did you really expect any?"
I did some internet searching (there is lots of stuff out there - many are good YouTube videos). I found I needed to do an update - it got a bit complicated here. Part of the update was done using the hidden slot on the LEFT side of the removable screen and part was done using a SD card on the LEFT side of the Unit. (Ender does NOT tell you this on their website!). I was already angry when I tried their slicer and it did NOT work - after not being able to get customer service again. I deleted their slicer and used my Cura. After doing a few prints using Cura (which works fine) a couple days later, I reinstalled their slicer and did some troubleshooting - I found I had a setting wrong. I use both Cura and their slicer now because of the differences. Each one has some features the other one lacks.
One example: The Cura has a large number of preset configurations, and it is easy to save a custom configuration.
The Creality titles the g-code with a filename that includes the estimate print time.
I tried customer service and actually someone! They did give me the manual settings for generic Pla - when I asked how to save those settings they send me to a useless link. I will research how to save one day - but will use my Cura for generic pla until then.
What I like about the machine.
1} While it is nosier (a trade-off for higher speed) - it is still much quieter than the original Ender I had before modifications.
2)The new ribbon and print head are a big improvement. The filament is easier to change, and you can easily make prints with different colors! I do not miss the bowden tube and individual wires at all!
3) I like to put my prints on a card. The old machine used a micro-SD card - and I quicky bought an adapter! The new machine takes regular SD cards and no adapter is needed!
4) I really like the automatic leveling feature. There have been times I have spent hours getting my manual table set the way I wanted. So far - it has worked great. I have only made about 50 prints - so I cannot tell you how reliable it is in long term use.
5) The quality of prints is much better than my old machine. I am not sure whether this due to being a better machine or the stepper motor needing replacement.
What I do not like:
1) The SD card has to be put into its slot upside down.
2) The controls and the SD card slot are all on the left side of the printer. I think putting the computer connection and the SD card would have been much better on the front of the machine.
3) Updating is like putting up a Christmas tree. The firmware is done with a hidden C connector on the left side of the detachable screen (this is like putting up a Christmas tree). Fine details on display etc. are put in using the SD card (this is like putting the lights on the tree). Once you figure out what goes where - it is the easiest printer to update I have had.
4. This one is a mixed bag. I do not give their customer service good marks - but the fact I found solutions on the internet was a good thing.
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Reviewed in the United States on April 5, 2026
★★★★★ 5
The K2 SE is a great entry level printer. Don't let the naysayers get you down!
Set name: K2 SE
I bought the K2 SE because it was inexpensive and I wanted to get into 3D printing. I had a Creality laser engraver that worked well, so I figured I'd go with the brand I knew. I bought the additional enclosure because I was planning to use this in the garage where my wood shop is, and I wanted to keep some dust out.
I have been pushing this thing pretty hard for three months now and it has not so much as looked at me cross eyed. It takes everything I throw at it. The quality seems to be there, as nothing is wearing out. I have a little superlube oil and grease to keep up the maintenance, and I suspect any failures people report have been on unmaintained machines. If you're the type that drives your car without changing the oil, 3D printing is not for you.
A quick note on 3D printing, for the uninitiated. When you see the one and two star reviews for the K2 SE, make sure you read why the reviewer is leaving the low rating. "Doesn't come with filament" - if you're not buying a combo with filament, none of the printers on the market come with filament. "Makes bubbles and pops when printing" - this is wet filament and not the fault of the printer (dry your filament). 3D printing is not a set it and forget it proposition, at least not at first. It requires a little skill (that can be built), a little knowledge (the U of Tube), and a little patience while you learn how to use the machine.
Now for the machine itself...
The print quality surprised me as a first time 3D printer user. I have purchased 3D printed items in the past and the lines were not something that impressed me. The K2 SE prints pretty much the same quality as the higher end Bambu Labs printers. The speed is all I could ask for, and I have fed this thing all kinds of PLA, PETG and TPU from Creality, Sunlu, Polymaker and AnyCubic without a problem. Any issues I have had have been the fault of the operator (me) not knowing I had to dry PETG before I use it. I have a Creality filament dryer now and dry my PETG right out of the package, then store it in an airtight container with dessicant. I have two printers running dried PETG sitting behind me right now and they're doing great.
If I have a single complaint about the K2 SE, it's the bed size. At 215 x 220 it's smaller than the industry "standard" of 256 x 256, and if you get some of the larger prints that are designed for a "standard" sized printer, they won't fit the build plate. But I knew that coming into this, because they advertise the size right up front.
Overall, I'm happy with the K2 SE. It was an excellent entry level printer and I have learned a lot from using it. I may even buy a second to add to my growing farm.
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Reviewed in the United States on May 20, 2026
★★★★★ 5
Creality K1 SE - Prints great with stock settings - needs a side spool mount
Set name: K2 SE, Set name: K2 SE
I bought the Creality K1 SE a little over a week ago. I had an Ender 3 S1 before this printer. The K1 SE is so, so much easier to print with right out of the box! I definitely recommend it. It's a good way to get the improvements that were built into Creality's K1C, but at a nicer price. Plus, you can install your own version of Klipper if you want.
I've printed 10 or so things in PLA and PETG, and I haven't had any failed prints. The automatic bed leveling has just worked. I have not had any problems with bed adhesion. On the Ender 3 S1, I only used a textured PEI plate, but the smooth build plate on the K1 SE works fine. The extruder cooling fan also seems ok for what I've printed so far. I printed an overhang test and the 75 degree overhang looks fine, but it had trouble at 80 degrees. The bridging test looked ok. (The longest bridge was only 25 mm on that test however.)
I've put the printer in a soft-sided enclosure that I had used for my old Ender 3 S1. (It's easy to find similar encolsures.) The LEDs on the K1 SE are bright enough to see inside which is something that I was concerned about before I purchased. However, this enclosure makes it difficult to access the back of the printer where the filament spool is mounted, so I designed a mount that clamps onto the side-bar - see the pictures. The files are on Printables - "Creality K1 SE Side Spool Mount".
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Reviewed in the United States on January 21, 2025
★★★★★ 3
Almost Good
Set name: K2 SE
The nozzle cleaning is completely ineffective. The wiper pushes material up the sides of the nozzle and melts onto the nozzle. The result is the nozzle leaves burnt debris on the prints. The calibration before each print only probes 5 points on the bed and the results are not satisfactory, with the nozzle being variously too close or too far from the bed. To adjust the z offset you have to go through several menus and the machine seems to not remember where you set it last time. Print quality is good except for VFAs. Part cooling fan is very loud at full speed.
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Reviewed in the United States on February 5, 2026