SKU: 83099485997

Water Pump Impeller Repair Kit – Fits Mercury Mariner 25-30 HP 4-Stroke Outboard (Replaces 853792A1, 853792T01)

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Description

Water Pump Impeller Repair Kit – Fits Mercury Mariner 25-30 HP 4-Stroke Outboard (Replaces 853792A1, 853792T01)Water Pump Impeller Repair Kit Fits Mercury Mariner 25 30 HP 4 Stroke Outboard (Replaces 853792A1, 853792T01) This water pump impeller repair kit is designed for Mercury Mariner 25 30 HP 4 stroke outboards (2006 and newer) and a range of Tohatsu Nissan 25 40 HP outboards. It provides all the necessary components for a complete water pump service to maintain your engine's cooling system. This kit is a direct replacement for Mercury OEM part numbers

Water Pump Impeller Repair Kit – Fits Mercury Mariner 25-30 HP 4-Stroke Outboard (Replaces 853792A1, 853792T01)

This water pump impeller repair kit is designed for Mercury Mariner 25-30 HP 4-stroke outboards (2006 and newer) and a range of Tohatsu/Nissan 25-40 HP outboards. It provides all the necessary components for a complete water pump service to maintain your engine's cooling system.

This kit is a direct replacement for Mercury OEM part numbers 853792A1, 853792A07, and 853792T01, as well as Tohatsu/Nissan part numbers 361-87322-0, 361-87322-1, and 361-87322-2.

  • Engineered as a direct OEM-quality replacement for straightforward installation.
  • Restores cooling system performance to prevent overheating.
  • Includes a complete set of gaskets, impeller, key, plate, and liner for a full service.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across brands.

Brand Part Number
Mercury / Mariner 853792A1
Mercury / Mariner 853792A07
Mercury / Mariner 853792T01
Tohatsu / Nissan 361-87322-0
Tohatsu / Nissan 361-87322-1
Tohatsu / Nissan 361-87322-2

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.

Confirm your engine model/year in the table below.

Mercury/Mariner Compatibility

Brand Model Rated HP Stroke Years OEM Part No. Notes
Mercury 25 HP 25 4-Stroke 2006 and newer 853792A1/853792A07/853792T01 S/N 0N018456 and above
Mercury 25 HP Sea Pro 25 4-Stroke 2006 and newer 853792A1/853792A07/853792T01 S/N 0R051710 and above
Mercury 25 HP EFI 25 4-Stroke 2006 and newer 853792A1/853792A07/853792T01 S/N 0R106999 and above
Mercury 25 HP EFI JET 25 4-Stroke 2006 and newer 853792A1/853792A07/853792T01 S/N 0R165086 and above
Mercury 30 HP 30 4-Stroke 2006 and newer 853792A1/853792A07/853792T01 S/N 0N001875 and above
Mercury 30 HP EFI 30 4-Stroke 2006 and newer 853792A1/853792A07/853792T01 S/N 0R106999 and above

Tohatsu/Nissan Compatibility

Brand Model Rated HP Stroke OEM Part No.
Tohatsu/Nissan NS25C2, NS25C3, M25C2, M25C3, M25H, MX25H 25 4-Stroke 361-87322-0/361-87322-1/361-87322-2
Tohatsu/Nissan NS30A3, NS30A4, M30A3, M30A4, M30H, MX30H 30 4-Stroke 361-87322-0/361-87322-1/361-87322-2
Tohatsu/Nissan NS35C, M35C 35 4-Stroke 361-87322-0/361-87322-1/361-87322-2
Tohatsu/Nissan NS40C, NS40C2, M40C 40 4-Stroke 361-87322-0/361-87322-1/361-87322-2

Technical Specifications

Specification Value
Product Type Water Pump Impeller Repair Kit
Installation Direct OEM replacement
Other Technical Attributes Raw sea water pump repair service impeller kit

Package Contents

  • 1 x Water Pump Impeller (345-65021-0, 47-16154-1, 161541)
  • 1 x Impeller Key (332-65022-0)
  • 1 x Gasket (348-65029-1)
  • 1 x Gasket (348-65018-0)
  • 1 x Insert (348-65011-0)
  • 1 x Guide Plate (348-65025-0)
  • 4 x Bolts & Washers (910103-5652)

Installation Guide

Professional installation is recommended. The general steps below are for reference only.

  1. Disconnect the battery and shift the outboard into neutral.
  2. Remove the lower unit by unbolting it from the midsection. Disconnect the speedometer tube if present.
  3. Place the lower unit on a workbench. Remove the bolts securing the water pump housing.
  4. Slide the old housing and impeller off the driveshaft. Note the orientation of the old impeller vanes.
  5. Clean the driveshaft and the mounting surfaces of the wear plate and housing.
  6. Install the new wear plate and gasket.
  7. Slide the new impeller key into the driveshaft keyway.
  8. Lubricate the new impeller and housing interior with a marine-safe lubricant.
  9. Install the new impeller onto the driveshaft, turning it clockwise to bend the vanes correctly.
  10. Position the new housing and gasket, then tighten the bolts to the manufacturer's specified torque.
  11. Reinstall the lower unit, ensuring the driveshaft, shift shaft, and water tube align correctly.
  12. Reconnect the battery and test the engine in a water source to confirm proper water flow.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my Mercury engine?

A: For Mercury and Mariner models, fitment is determined by the serial number (S/N). This kit fits 25 HP models with S/N 0N018456 and above, and 30 HP models with S/N 0N001875 and above. Please check the compatibility table and your engine's serial number plate before ordering.

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

A: Common signs of a failing impeller include the engine overheating at idle or low speeds, a weak or non-existent water stream from the "tell-tale" outlet, and visible cracks or damage on the impeller vanes during inspection.

Q: How often should I replace the water pump impeller?

A: As a general maintenance guideline, we recommend inspecting the impeller annually and replacing it every 1-2 years or every 100-200 hours of operation, depending on usage conditions (e.g., saltwater vs. freshwater).

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: 83099485997

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4.0 ★★★★★
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Product Reviews
K
Verified Purchase
Kindle Customer
Houston, US
★★★★★ 5
High Quality Rolling Chair
Color: Black/Silver
My son LOVES this desk chair. He has a drafting table to draw and do schoolwork on, and this provides him a comfortable chair to work in. It is sturdy and easy to clean. It does not fold, but it does roll easily. It was VERY EASY to put together. We were also pleased with the price. He will be able to use it for years to come.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 2, 2026
T
Verified Purchase
Thi
Los Angeles, US
★★★★★ 5
The Greatest Chair I've Ever Sat In
Color: Black/Silver, Color: Black/Silver
When I was a boy, my first office chair that I used for PC and laptop work growing up was this chair. This was back before 2010 so it likely wasn't under the Amazon Basics brand but it was the exact same chair design. I've used that chair my entire life really and only had to buy this chair as a replacement as the leather started peeling significantly on my old chair after over 20 years of use. Even though the leather was heavily peeled, my old chair was still extremely comfortable and I would've kept on using it had I not gotten annoyed with having to pick up leather bits and pieces everyday from the peeling. I bought this chair as a replacement and the comfort is still as I remembered. No lower back pain, no butt numbness, no arm numbness, truly such a masterpiece of a chair where it lets you focus on the task at hand instead of focusing on the chair. Before I rebought this chair, I've bought & tried the Secretlab Titan Evo Nanogen, Furmax executive office chair, Neo executive office chair, RS high back gaming chair w/ flip-up armrests, Bestfair high-back office chair, FDW executive office chair, Herman Miller Aeron, and OFIKA executive office chair in search of a potential "upgrade" - every single one of these other chairs was inferior to the Amazon Basics high back office chair in one way or the other. The only thing I will note is that the pneumatic gas cylinder of the Amazon Basics office chair seems to be different from my original chair - it goes higher and has a higher minimum seat height. If you would like to perfectly replicate the original lower seat depth you will have to buy the S6124 extra short office chair gas lift cylinder from ChairPartsOnline - my only nitpick about such a phenomenal chair. In my attached picture I have the Amazon Basics chair w/ S6124 gas cylinder on the right next to the Furmax high-back office chair which although inferior is what I consider to be the 2nd best chair if for some reason you cannot get the Amazon Basics high-back office chair. To sum it up - I HIGHLY RECOMMEND THIS CHAIR!!!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 2, 2025
L
Verified Purchase
Lab_Lady
Chelsea, US
★★★★★ 4
Comfortable Office Chair
Color: Black/Silver
I have had several office chairs here in my office. Even though this office chair was a bit difficult to assemble, it appears to be a quality item. I was NOT impressed with the instructions - at all. More specific instructions would have been nice. Only time will tell if this was a good purchase and this chair is a good value. Not a bad price for the item as well.
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Reviewed in the United States on May 15, 2026
A
Verified Purchase
Adam
Louisville, US
★★★★★ 5
All-around good chair, suitable for me at 6'6", comfortable and no issues
Pros: The assembly is straightforward and doesn't require much strength; I would expect my mother to have no issue putting this chair together. If you're elderly or disabled, a relative or helper should have an easy and quick time of putting it together, and there is very little chance of making a mistake during assembly. Sturdy at and slightly above the recommended weight limit. I peaked around 256 or 258lbs while using this chair, and it didn't show any signs of complaint then, and it hasn't shown signs of wear since. Really comfortable. I'm an eight-hours-a-day user, almost without exception, and I have no complaints. The leather holds up very well. I don't expect this to be true forever, but after approximately 1800 hours of use, there is no tear or warning sign. It leans back super stably. That's the most important aspect for me. It's tall enough to support my 6'6" frame. My back rests comfortably, so the odds are yours will fit, too. For the scary few who tower over me, and so you can search it easily, here's a height guide: 6'3" 6'4" 6'5" - The chair is good for your heights 6'7" - You should also be well served, unless your height is mostly in your torso. 6'8" - You're at the cusp. I think you will be comfortable in this chair, and alternatives that are built for our (mostly your) height cost so much more. I'd give it a try. I wish you luck. 6'9" 6'10" 6'11" - This is written for 6'9. For 6'10, 6'11, scale the significance of the caution. I think this chair will prove uncomfortable for you or encourage bad posture. I'd encourage you to look elsewhere. Cons: This is well covered in other reviews: the caps that cover up the screws on the side of the arms are poorly designed. One falls off every day or two. It's a minor inconvenience, but it's optional. You can toss the caps in the trash. The screws are not exposed. They sit deep within the plastic of the arm. Personally, I just push the covers back on when I notice they fell. The armrests could be better for me, I think. I'm not sure exactly what my complaint is. I think they are a little too narrow for my liking, but I'm 6'6" with broad shoulders and long arms and unusual joints. The spacing seems fine for a typical user. Notes: I only sit leaning the chair back or sitting up straight at the edge of my seat. Some aspects of this review may not translate perfectly to locked-in-place, sitting back, upright usage.
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Reviewed in the United States on July 8, 2018
E
Verified Purchase
Eva Alford
Charlottesville, US
★★★★★ 5
Awesome!
Update: March 2022 - Funny reading my previous review now. All the cons I mentioned before, I literally don’t even notice at all. In fact, I like the chair I got so much I just got another in white. My boyfriend is using the old one and I needed one for my home office. And sadly, my cats did scratch up the black chair a little (the cats live outside now) but the chair has otherwise stood up to use perfectly. Other than the scratches, is basically like new. I do wish I knew of a good repair kit cause I would like to fix up the scratches. The chair is just extremely comfortable and supportive which I need even more these days for my home business. A very good purchase!! I just received my chair 2 days after ordering it. It took me about 20 minutes to put it together which was very easy. I am sitting in it now typing this review. Pros: -Very attractive. I ordered the black color and it appears just as in the pictures. -Slides smoothly over my linoleum floors. -Seat is soft and comfortable, hopefully it will stay that way over time, but too soon to tell. -Very easy to assemble. -The seat is good size for the average American and seems comparable in width to the chairs I use at work. Cons: -The chair does not lower as much as I wanted. I like my legs at a 90 degree angle when sitting. It is close with my shoes on, but about 2 inches to high. If I had known this, I very likely would not have ordered this chair as its one of my most important features for sitting comfortably. I am 5'6”. I hope that with a little wear the cushion will compress a bit, and if not I may get a small foot stool to solve the problem. -As others have described, this chair pretty much doesn't recline in any appreciable way even at the loosest setting. Basically to stay reclined you have to keep your legs pushing back the whole time which eliminates the point of reclining. I have read from others that over time, this loosens up. This feature is not very important to me, but may be to others. -The seat depth is about 2 inches shorter than I would like. Overall, I think it is a quality chair for the price assuming the above negatives aren't deal breakers for you. I will be keeping this chair since I do not spend a lot of time at my desk and the overall quality outweighs the few negatives for me.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 27, 2016

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