SKU: 71200060428

Water Pump Impeller Kit – Fits Mercury Marine 25-30 HP & Tohatsu/Nissan 25-40 HP (Replaces 853792A07, 361873220)

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Description

Water Pump Impeller Kit – Fits Mercury Marine 25-30 HP & Tohatsu/Nissan 25-40 HP (Replaces 853792A07, 361873220)Water Pump Impeller Kit Fits Mercury Marine 25 30 HP & Tohatsu Nissan 25 40 HP This comprehensive water pump repair kit is designed for a direct fit on Mercury Marine 25 30 HP 4 Stroke EFI engines (2002 and up). It also provides broad coverage for various Tohatsu and Nissan 25 40 HP 2 Stroke engines (1996 2005) and 25 30 HP 4 Stroke engines (2002 2017), restoring cooling system performance and reliability. This kit serves as a direct replacement for

Water Pump Impeller Kit – Fits Mercury Marine 25-30 HP & Tohatsu/Nissan 25-40 HP

This comprehensive water pump repair kit is designed for a direct fit on Mercury Marine 25-30 HP 4-Stroke EFI engines (2002 and up). It also provides broad coverage for various Tohatsu and Nissan 25-40 HP 2-Stroke engines (1996-2005) and 25-30 HP 4-Stroke engines (2002-2017), restoring cooling system performance and reliability.

This kit serves as a direct replacement for Mercury part numbers 853792A07, 853792A1, and 853792T01, as well as Tohatsu/Nissan parts 361-87322-0, 361873220M, and 361873220.

  • Installation Type: Direct OEM-style replacement.
  • Complete Assembly: Includes a new impeller, gaskets, wear plate, insert cup, and hardware.
  • Quality Construction: Made with a durable neoprene rubber impeller and marine-grade stainless steel components.

Part Number Cross-Reference

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

Brand Part Number
Mercury Marine 853792A07
Mercury Marine 853792A1
Mercury Marine 853792T01
Tohatsu / Nissan 361-87322-0
Tohatsu / Nissan 361873220M
Tohatsu / Nissan 361873220

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 Marine

Brand Model Rated HP Stroke Years OEM Part No. Notes
Mercury Sea Pro 25 4-Stroke 0R051710 & Up 853792A07 -
Mercury EFI Standard 25 4-Stroke 0R106999 & Up 853792A07 -
Mercury EFI JET 25 4-Stroke 0R165086 & Up 853792A07 -
Mercury EFI Standard 30 4-Stroke 0R106999 & Up 853792A07 -

Tohatsu & Nissan

Brand Model Rated HP Stroke Years OEM Part No. Notes
Tohatsu M25C2 25 2-Stroke 1996-2005 361-87322-0 -
Tohatsu M25C3 25 2-Stroke 2002-2005 361-87322-0 -
Tohatsu M30A3 30 2-Stroke 1996-2002 361-87322-0 -
Tohatsu M30A4 30 2-Stroke 2002-2005 361-87322-0 -
Tohatsu M35C 35 2-Stroke 2002 361-87322-0 -
Tohatsu M40C 40 2-Stroke 1996-2004 361-87322-0 -
Nissan NS25C2 25 2-Stroke 1996-2002 361-87322-0 -
Nissan NS25C3 25 2-Stroke 2002-2005 361-87322-0 -
Nissan NS30A3 30 2-Stroke 1996-2002 361-87322-0 -
Nissan NS30A4 30 2-Stroke 2002-2005 361-87322-0 -
Nissan NS35C 35 2-Stroke 2002 361-87322-0 -
Nissan NS40C 40 2-Stroke 1996-2004 361-87322-0 -
Nissan NS40C2 40 2-Stroke 2002-2004 361-87322-0 -
Tohatsu/Nissan 4-Stroke Models 25-30 4-Stroke 2002-2017 361-87322-0 Specific models not detailed

Technical Specifications

Product Type Water Pump Impeller Repair Kit
Installation Direct OEM Replacement
Fuel Type Gasoline
Housing Material Marine-grade Neoprene Rubber Impeller, Non-asbestos Gasket, Stainless Steel Hardware
Housing Color Black (Impeller), Silver (Metal Components)
Weight 130 g (4.6 oz)
Warranty 1-year Manufacturer Warranty (Aftermarket)
Other Technical Attributes Produced in ISO9002-certified factory

Package Contents

  • 1 x Water Pump Impeller (345-65021-0/47-16154-1/161541)
  • 1 x Impeller Key (28-161582/348-65018)
  • 1 x Gasket (278-161602/348-65029-1)
  • 1 x Gasket (27-161582/348-65018-0)
  • 1 x Insert Cup (161572/348-65011-0)
  • 1 x Wear Plate (161592/348-65025-0)
  • 4 x Bolts & Washers (910103-565)

Installation Guide

  1. Safety First: Disconnect the battery and disable the ignition system before beginning.
  2. Access the Pump: Remove the lower unit (gearcase) from the outboard motor to access the water pump assembly.
  3. Disassemble Housing: Unbolt and remove the water pump housing, taking note of how the components are assembled.
  4. Remove Old Parts: Take out the old impeller, gaskets, wear plate, and insert cup. Clean all mating surfaces thoroughly.
  5. Install New Components: Install the new gasket, wear plate, and insert cup into the housing.
  6. Install Impeller: Slide the new impeller onto the driveshaft. Turn the shaft clockwise while pushing down to correctly orient the impeller vanes.
  7. Reassemble Housing: Reinstall the water pump housing and tighten the bolts to the manufacturer's specified torque.
  8. Reinstall Lower Unit: Reattach the lower unit to the engine, ensuring the driveshaft and shift shaft align correctly.
  9. Test Operation: Reconnect the battery. Start the engine in a water supply (using flushing muffs or in the water) and confirm that water is exiting the tell-tale port.

Troubleshooting & FAQ

How do I confirm this fits my engine?
The most reliable method is to match your engine's model and serial number against our compatibility tables. For Mercury engines, year ranges are often given by serial number breaks (e.g., "0R106999 & Up"). Cross-reference the OEM part number stamped on your old parts with those listed in our cross-reference table.

What are the signs of a failing water pump impeller?
Common signs include a weak or non-existent water stream from the "tell-tale" outlet, engine overheating alarms, or visible cracks, stiffness, or missing blades on the old impeller upon inspection.

How often should I replace the water pump impeller?
As a critical preventative maintenance item, most manufacturers recommend replacing the impeller every 1-2 years or every 100-200 hours of operation, whichever comes first. This interval can be shorter if you frequently operate in sandy, silty, or saltwater conditions.

OEM vs. Aftermarket?
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.

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

What is your warranty and return policy?
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: 71200060428

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4.4 ★★★★★
Based on 16 reviews
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Product Reviews
M
Myst
Draper, US
★★★★★ 5
Precise, with super focused controls.
Color me impressed. I wanted to upgrade from an old Oster brand scale. It was a workhorse, and I still use it, but I prefer this Maestri House scale for coffee and tea. I compared them side-by-side, and their measurements are near identical. I've abused my old one, so I would imagine the M H to be more reliably calibrated, although the differences in readings while set to Grams was .01, so, for me, inconsequential, and may well have been user error as I had no control to measure them against. Here's what I like and prefer about the Maestri House S1: I love that it is rechargeable with readily available USB-C cords. I can take it with me, and not have to worry about swapping batteries. I love the silicone band that protects the platform. It is easy to clean, and doesn't seem to interfere with measurements. The scale is very sensitive. I could add or remove a literal pinch of ground coffee and it would register on the scale. The digital readout is bright enough to easily see. The controls could not be simpler: tap once to Tare, twice to change the unit of measurement. You can set it to liquid or dry ingredients as well. I also love that I can switch between grams and ounces without having to remeasure. Most scales do that these days, but I appreciate it. The timer is simple and easy to control--a very nice inclusion. Also, since the buttons are VERY sensitive, I barely have to touch them, so the scale stays perfectly still, and they work with wet hands. This device is focused, designed to be especially effective for making coffee or tea. It is compact, which makes it the perfect size for cups, mugs, filter baskets, etc. I wouldn't use it for baking or other kitchen tasks. Ok, I WOULD try to use it for that--I just wouldn't recommend it. It's too small for bowls and trays, because it wasn't designed for those. It is PERFECT for brewing and drink mixology. Also, I prefer to keep scales like these designated to weights under 5 pounds--let the Oster handle the big stuff. Overall, I think it's a fantastic little scale. I have had no reliability issues. Will it hold up over time? I think so. Plus, it looks great in my coffee corner. Satin black is kind of my theme. Happy brewing!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 15, 2026
B
Brian from California
Draper, US
★★★★★ 5
Great tiny scale!
I love this scale, though I don’t use it in the way it was intended. It’s designed to assist in making optimal coffee drinks. I just needed a scale with accurate fractional ounces readings. I use it for weighing ingredients for baking, or even light postal packages. It seems accurate, and it very easy to use. I keep it in manual mode, but it also has espresso and pour over modes. It can display weights in ounces or grams, and it has a tare function. The buttons are touch sensitive, so you don’t have to press hard. There is a beep when you touch a button, but the sound can be turned off. I’m a little confused on the charging function. I don’t usually like rechargeable devices, because it makes them disposable, and also because it means they are dead when I want to use them. So I was pleased when it seemed to work while plugged into my fast wall charger. The I read the manual which said A) the scale cannot be used while charging, and B) never use a fast charging power supply. Maybe they’re just trying to protect their liability. I’ll try to be more obedient in the future. The manual also says not to place objects weighing more than 2000g on it, to avoid damaging it. I violated that rule as well and it still seems to be functional. Overall, this is a great, feature-packed little scale, and worthy of someone better than I, who will actually use it to its full potential without breaking the rules.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 23, 2026
M
Matt
Waukegan, US
★★★★★ 4
Wonderful addition
Maestri House makes some great devices for the kitchen. Currently this scale is my 4th item in my MH collection. The scale fits perfectly on my espresso machine and provides very accurate measurements. The buttons respond quickly and the read out is fabulous for those weary mornings when my eyes are trying to open up. The other great thing MH does with their gear is the ease of use options. I flip a switch, place the scale, hit the buttons and the scale works to perfection. Wonderful addition, as always, for another device in my MH collection.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 14, 2026
D
Verified Purchase
D
Battle Creek, US
★★★★★ 5
Great scale that needs some improvements to be perfect
Color: White, Color: White
Very accurate scale, looks good in white, timer works nicely and I do like the concept of the ratio conversion. Shown in photos with 0 measurement drift over time, even without the silicone mat. To make this the best scale in the price range, I would change: - The auto timer function. Timing currently stops if you pick up the brew to swirl; you must completely restart the process if you do happen to pick it up. I would change that to only stop on user input (pressing a button). - The ratio conversion. Why offer XX.0 precision if you can only change the ratio in whole amounts? I'd suggest offering 0.1 increments, selectable with +/- buttons instead of cycling through. - The silicone mat is not well affixed and slides around. Kind of useless as-is and I just keep it off. I would wrap the whole thing around the measurement platform, similar to how the Greater Goods scale does it, to really keep it secure. It's not perfect, but for the price, it's a 4.5/5 for me. Rounding up to 5 since a 4 is considered "bad" by today's online rating standards.
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Reviewed in the United States on December 22, 2025
D
Verified Purchase
donttellitme
West Palm Beach, US
★★★★★ 5
IMO, a filter coffee lovers best scale option on a budget. Solid grade A choice.
Color: Black
I have two other .1mg "coffee" or food scales that I used regular for pour overs. I saw this has 4x display on real time flow rate, g/mg weight, timer, and grounds to water ratio for a solid price and purchased this after reading some reviews. One of my scales has these features, but the workflow on this scale just clicked a ton better for me. The beep isn't super loud annoying which is a major relief, as I just couldn't keep sound on on my other scale due to that trigger honestly. I tried brew mode immediately and will now only use that when making a pour over. Loved the beep alerting when I finally hit the proper ratio and I like it keeps my final info on screen after the brew for my study. I can actually practice my technique now and not have split attention as much. This is still compact, but fits a larger carafe well whereas my other scale is a better fit for the espresso machine. The display is clear and buttons have a slight tactile sensation from the print, but are still the capacitive touch based style. I tested it with weights and it is my most accurate scale, it hit the .1g accurately every time or at worst would fluctuate back and forth quickly from the true value (more than enough for me to trust it). It updates and tares from power on fairly fast, it reacts fast enough to touch to not make me pause much. My nitpicks are that the front clear matte plastic isn't quite uniform flat viewed at an off angle giving it a cheaper look, but that doesn't affect functionality at all and truth is, it really was very affordable for the feature set I feel. The second nitpick was that the scale's mat does not grip well or fit securely over prompting it to move around easily. For this I had to modify using some rubberized grip tape on the surface of scale underneath the mat itself. Now it doesn't slide from vibration and if any pressure down it doesn't slip. I could have removed it totally, but it is attractive and useful once stabilized. With that modification done, I can fully recommend this scale for filter coffee lovers at any price. Great product, hopefully lasts me a long time.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 16, 2025

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