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Description
Upper Water Pump Repair Kit – Fits MerCruiser Alpha One Gen II (Replaces 817275Q05)Upper Water Pump Repair Kit Fits MerCruiser Alpha One Gen II (Replaces 817275Q05) This is an aftermarket upper water pump repair kit designed for MerCruiser Alpha One Generation II stern drive units manufactured from 1991 and newer (serial numbers 0D469859 and up). It provides a reliable, direct fit solution for maintaining your engine's cooling system. This kit serves as a direct replacement for Mercury part numbers 817275Q05 and 817275K05, as well
Upper Water Pump Repair Kit – Fits MerCruiser Alpha One Gen II (Replaces 817275Q05)
This is an aftermarket upper water pump repair kit designed for MerCruiser Alpha One Generation II stern drive units manufactured from 1991 and newer (serial numbers 0D469859 and up). It provides a reliable, direct-fit solution for maintaining your engine's cooling system.
This kit serves as a direct replacement for Mercury part numbers 817275Q05 and 817275K05, as well as Sierra 18-3147 and GLM 12043.
- Includes all necessary components for a complete upper unit overhaul, including the housing, impeller, gaskets, and plates.
- Features a durable stainless steel housing for corrosion resistance and longevity.
- Engineered for a direct fit, simplifying the installation process.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Mercury | 817275Q05 |
| Mercury | 817275K05 |
| Sierra | 18-3147 |
| GLM | 12043 |
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.
MerCruiser
| Brand | Model | Years | OEM Part No. | Notes |
|---|---|---|---|---|
| MerCruiser | Alpha One Gen II | 1991 and newer | 817275Q05 | Serial numbers 0D469859-0F679999 |
| MerCruiser | Alpha One Gen II | 1991 and newer | 817275Q05 | Serial numbers 0F680000-0K999999 |
| MerCruiser | Alpha One Gen II | 1998 and newer | 817275Q05 | Serial numbers 0L100040 and up |
| MerCruiser | Vazer | [Data Needed] | 817275Q05 |
Mercury Marine
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Mercury | 225hp (3.0L Carb) | 225 | 2-Stroke | 817275Q05 | Serial numbers 0D280813-0G760299 |
| Mercury | 225hp (3.0L EFI) | 225 | 2-Stroke | 817275Q05 | Serial numbers 0G129222-0G760299 |
| Mercury | 225hp Marathon (3.0L Carb) | 225 | 2-Stroke | 817275Q05 | Serial numbers 0G245605-0G760299 |
| Mercury | 225hp SeaPro (3.0L Carb) | 225 | 2-Stroke | 817275Q05 | Serial numbers 0G245605-0G760299 |
| Mercury | 250hp (3.0L EFI) | 250 | 2-Stroke | 817275Q05 | Serial numbers 0G129222-0G760299 |
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Upper Water Pump Repair Kit |
| Installation | Complete unit replacement |
| Connection | Direct mount to stern drive |
| Housing Material | Stainless steel |
| Housing Color | Silver/metallic |
| Fitting Type | Direct fit, stainless steel guide fittings |
| Other Technical Attributes | 11-piece complete kit |
Package Contents
- 1 x Upper Housing
- 1 x Impeller
- 1 x Key (for impeller)
- 1 x Gasket, Water Pump Base
- 1 x O-ring
- Multiple x Water Guide Fittings
- Multiple x Additional Gaskets and Plates
- 1 x Face Seal with Installation Tool (Note: may not be in all kits)
Installation Guide
- Safety First: Disconnect the boat's battery before beginning any work.
- Drain Fluid: Place a drain pan under the stern drive and remove the gear lube drain/fill screws to empty the fluid.
- Separate Drive: Remove the trim ram nuts and the main nuts holding the Alpha drive to the bell housing. Carefully separate the drive unit.
- Access Pump: With the drive separated, locate the upper water pump assembly. Remove the bolts securing the pump housing.
- Remove Old Pump: Lift off the old pump housing. Remove the old impeller, key, wear plate, and gaskets.
- Clean Surfaces: Thoroughly clean all mating surfaces, ensuring they are free of old gasket material and corrosion.
- Install New Kit: Assemble the new kit in reverse order. Place the new base gasket, plate, impeller, and key.
- Seat Housing: Install the new O-rings and guide fittings. Carefully slide the new housing into place and tighten the bolts to the manufacturer's specified torque.
- Reassemble Drive: Re-attach the stern drive to the bell housing, ensuring the driveshaft and water tube align correctly.
- Refill & Test: Refill the drive with fresh gear lube. Reconnect the battery, start the engine using a water supply (muffs), and confirm a steady water stream from the tell-tale outlet.
Troubleshooting & FAQ
Q: How do I confirm this fits my Alpha One Gen II?
A: This kit is specifically for MerCruiser Alpha One Gen II drives. You must verify your drive's serial number. It fits units with serial numbers 0D469859 and higher. If your serial number is lower, you likely have a Gen I drive, which requires a different kit.
Q: What are the symptoms of a failing water pump?
A: The most common sign is the engine running hotter than normal or overheating. Other indicators include a weak or non-existent water stream from the "tell-tale" outlet, or finding brittle, cracked, or broken vanes on the impeller during a visual inspection.
Q: How frequently should the water pump impeller be replaced?
A: As a critical preventative maintenance item, it is best practice to inspect the impeller annually. We recommend replacing it every 1-2 years or every 100-200 hours of operation, whichever comes first, especially if you operate in saltwater or debris-heavy 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
4.8 ★★★★★
Based on 27 reviews
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Product Reviews
★★★★★ 3
Not as tall as anticipated
Color: Black, Size: Wheel-6 Panel
Definitely not 6 feet tall, more like 5 1/2. Very sturdy and the fabric is thick. Works well for what we're using it for.
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Reviewed in the United States on November 30, 2025
★★★★★ 5
Easy to put together
Color: Grey, Size: Wheel-6 Panel
Love them
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 17, 2025
★★★★★ 5
Versatile Room Divider With Easy Assembly and Strong Coverage
Size: 3 Panel 12FT W
I picked up this Siebwin 3-panel folding room divider mainly for privacy and room separation, and overall it works very well.
Assembly is very straightforward, and the divider can be set up, taken apart, and stored without much effort. The fabric quality feels good, and the frame construction is stronger and more stable than expected. The support tubes especially feel well built and help keep the divider standing securely.
One feature I really liked is the flexibility of the design. The panels can be used together as a complete divider or separated depending on the setup and available space. That makes it much more versatile for different room layouts or temporary privacy needs.
The coverage is also very good, and the size matches the manufacturer’s description accurately. The fabric blocks light and background visibility well enough to provide solid privacy without feeling overly heavy. The wider feet also help improve stability compared to thinner folding dividers.
Another positive detail is that everything arrived complete with no missing parts or damaged pieces, which made assembly much easier and faster.
Compared to cheaper privacy screens, this one feels more durable and easier to customize depending on the situation. In terms of value for the money, it feels like a very practical and worthwhile purchase considering the size, flexibility, and build quality.
Overall, a versatile and well-built room divider with easy assembly, strong privacy coverage, stable construction, complete included parts, flexible panel configuration, and excellent everyday functionality.
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Reviewed in the United States on May 27, 2026
★★★★★ 5
Stable, flexible in deployment configuration, creates true privacy and looks great.
Size: 3 Panel 12FT W
This is the second room divider panel I have installed, and there are several features about this one that I like much better than my older one.
The fact that there are no gaps and that the material is thicker means you get more privacy or more hiding power, if you wish. My older divider has vertical spaces between each of the panels and the panels are half as wide as the Siebwin panels, so there are many vertical spaces. The Siebwin divider really creates privacy.
Another feature that I really appreciate is that the legs are wider and stand off from the floor. On my older one the legs are flat and they're rather awkward to adjust because they create more drag on the floor. The feet on the older one also loosen if you turn them counter clockwise, so adjustments of configuration that require the feet to be moved are more complex.
The older divider also must be deployed in a zig-zag fashion because he feet are not as wide, but this new one can be deployed and stable in a straight, an "N" shape or an arc. They are both the same length, but because the older one must be use in a zig-zag deployment it doesn't reach to the length of the new one.
The Siebwin divider definitely costs more at $103.48, but it sports several features and advantages over the other brand, so it does a better job and is worth the extra cost.
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Reviewed in the United States on May 25, 2026
★★★★★ 4
Easy to assemble, does the job, material is shiny nylon and shows creases, minor defects, sloppy
Size: 3 Panel 12FT W, Size: 3 Panel 12FT W
The Siebwin room divider is a good idea, and for the price, it mostly delivers on the intended functionality. I ordered the 12 foot, 3-panel version mainly to hide an unfinished basement storage area that had become an eyesore. It works well for that purpose and gives the space a cleaner appearance without spending the kind of money that more decorative dividers or custom partitions cost. If you need something temporary, portable, or mainly functional, this is a viable option.
There are a few limitations that became obvious during setup and use. The first thing I noticed was that the weld quality on some of the metal poles is fairly sloppy. Once the cover is installed, you do not really see it, but up close, it does not look especially refined or professional. The blackout material also is not a matte canvas style fabric as I expected. It has more of a shiny nylon appearance, and the creases are fairly visible. Being that it’s more of a nylon, I’d be hesitant to try steaming it to remove the creases. However, the creases do not matter if you are using it in a basement, dorm, or shared room, but for photography, video work, or a professional office setting, the appearance could be disappointing. The fabric is thick enough, though. It blocks visibility well enough, but strong light behind it still shows through to some extent, nothing deal-breaking. Also, my fabric appeared to be slightly defective. The hook and loop strip on one of the bottom sections was off-center and couldn't be totally attached because it was lined up with one of the legs. I originally hoped to use this as a video backdrop, but I will probably end up replacing the fabric with a proper green screen or canvas material while continuing to use the frame itself. For now, it does a good job of covering my basement junk.
Assembly was actually easier than I expected and took roughly 15 to 20 minutes. The longer vertical poles are tethered together similarly to tent poles, which made setup straightforward and fairly intuitive. The shorter horizontal pieces slide and snap together to the top and bottom of the vertical assembly. After each section is assembled, the divider panels connect together with metal plates and two knurled screws (at the top and bottom), so no tools are really required. A few screws were difficult to start because paint had gotten into the threads, but once they caught, they tightened down normally. The feet install with similar knurled fasteners and help keep the divider reasonably stable. One thing to watch for during setup is the fabric orientation. There is one arrow indicator in the middle of the fabric to indicate up. However, if you need another indicator, the smaller hook and loop strip goes on the bottom while the longer strip goes on top. I realized mine was upside down right before finishing and had to redo it. I wasn't difficult to redo, despite the defect in mine.
The overall design is practical and easy to move around. I do like that the panels can fold and bend into different shapes depending on the space. The widened feet help stability, although when trying to stretch the fabric tight, I noticed the poles sometimes wanted to overlap slightly at the joints. Tightening everything helped somewhat, but it still happened occasionally. The divider feels adequate for normal indoor use, though I would not expect premium durability or luxury-level fit and finish at this price point. The entire device can also be easily disabled and stored in a tote if you need it completely out of the way. It comes with assembly instructions, but even if you didn’t have them, it’s easy to build without them (save a mistake or two).
In terms of value, I think the Siebwin divider mostly matches its price. Around $100 gets you a large freestanding partition with decent usability and easy assembly, but there are compromises in materials, appearance, and refinement. The defects are also off-putting, but hopefully you won't have them. Higher-end room dividers can easily cost two or three times more, so some of the tradeoffs are expected. I also noticed cheaper alternatives online, but based on the quality here, I suspect those would probably have even more issues. For practical home use, temporary privacy, hiding storage areas, or separating shared spaces, this is a good option as long as expectations stay realistic.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 18, 2026
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