SKU: 43601434665

Water Pump Impeller Kit – Fits Mercury/Mariner 8-9.9 HP 4-Stroke 209cc

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Description

Water Pump Impeller Kit – Fits Mercury/Mariner 8-9.9 HP 4-Stroke 209ccWater Pump Impeller Kit Fits Mercury Mariner 8 9. 9 HP 4 Stroke 209cc (Replaces 8M0120837, 3V1 87500 0) This comprehensive maintenance kit includes all the necessary components to service the water pump and cooling system on select Mercury, Mariner, and Tohatsu 8 9. 9 HP 4 Stroke (209cc) outboards. It is designed for models from 2018 and newer (serial number 0R042475 and above) with a standard gearcase. It serves as a direct replacement for Mercury

Water Pump Impeller Kit – Fits Mercury/Mariner 8-9.9 HP 4-Stroke 209cc (Replaces 8M0120837, 3V1-87500-0)

This comprehensive maintenance kit includes all the necessary components to service the water pump and cooling system on select Mercury, Mariner, and Tohatsu 8-9.9 HP 4-Stroke (209cc) outboards. It is designed for models from 2018 and newer (serial number 0R042475 and above) with a standard gearcase.

It serves as a direct replacement for Mercury part numbers 8M0120837 and 803748K01 (water pump components only), and Tohatsu part number 3V1-87500-0.

  • Installation: Designed for a direct fit, replacing original OEM components without modification.
  • Fuel Type: Compatible with gasoline engines.
  • Complete Service: The kit includes a new impeller, thermostat, fuel filter, and all required gaskets and pins for a full service.

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.

For Tohatsu owners, confirm your engine model and specifications in the table below.

Brand Model Rated HP Stroke Years OEM Part No. Notes
Mercury F8/F9.9 8-9.9 4-Stroke 2018+ 8M0120837 Standard gearcase only, S/N 0R042475 and above
Tohatsu MFS8 8 4-Stroke 3V1-87500-0 209cc
Tohatsu MFS9.8B 9.8 4-Stroke 3V1-87500-0 209cc
Tohatsu MFS6BZ 6 4-Stroke 3V1-87500-0 209cc

Technical Specifications

Specification Value
Product Type Outboard Motor Maintenance Kit / Water Pump Impeller Kit
Installation Direct OEM replacement
Fuel Type Gasoline
Housing Material Rubber (impeller)

Package Contents

  • 1 x Water Pump Impeller (Replaces Mercury 47-8037481, Tohatsu 3B2-65021-1)
  • 1 x Cotter Pin (Replaces Mercury 951403-0310)
  • 1 x Pin Key (Replaces Mercury 9521811, Tohatsu 3B2-65022-0)
  • 1 x Pin (Replaces Mercury 951503-0318)
  • 1 x Thermostat (Replaces Mercury 8M0119207, Tohatsu 3NV-01030-0)
  • 1 x Thermostat Gasket (Replaces Mercury 27-8M0214960, Tohatsu 346-01032-0)
  • 1 x Fuel Filter (Replaces Mercury 35-8M0157133, Tohatsu 369-02230-0)
  • 1 x Drain Gasket (Replaces Mercury 12-895146, Tohatsu 3R3-07406-0)
  • 2 x Drain Gaskets (Replaces Mercury 8M0075255, Tohatsu 332600060)

Installation Guide

  1. Ensure the engine is off, disconnect the battery, and shut off the fuel supply.
  2. Drain the lubricant from the lower unit gearcase.
  3. Remove the lower unit assembly from the outboard's driveshaft housing.
  4. Unbolt and carefully lift the water pump housing to expose the old impeller.
  5. Note the rotational direction of the old impeller fins before removing it.
  6. Remove the impeller, wear plate, key, and any gaskets.
  7. Thoroughly clean all mating surfaces and inspect the housing for cracks or warping.
  8. Install the new components from the kit in reverse order. Ensure the impeller key is seated correctly and fins are oriented property.
  9. Locate and replace the engine thermostat and its gasket.
  10. Replace the old fuel filter with the new one from the kit.
  11. Reassemble the lower unit, refill with fresh gearcase oil, and reinstall it on the outboad.
  12. Once assembled, start the engine at idle and confirm a steady stream of water is exiting the tell-tale port.

Troubleshooting & FAQ

How do I confirm this kit fits my Mercury engine?
This kit is specifically for Mercury and Mariner 8-9.9 HP (209cc) 4-stroke models manufactured in 2018 or later, with a serial number of 0R042475 or higher. It is critical to check your engine's serial number before purchasing to ensure compatibility.

What are the signs my water pump impeller needs replacement?
The most common symptoms of a failing impeller are the engine overheating at idle or low speeds, or a weak, inconsistent, or non-existent water stream from the tell-tale (peephole) outlet. During inspection, a damaged impeller may have cracked, brittle, or missing fins.

How often should I service the water pump?
For preventative maintenance, we recommend inspecting the water pump impeller annually and replacing it every 1-2 years or every 100-200 hours of operation, whichever occurs first. This helps prevent unexpected engine overheating and potential damage.

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: 43601434665

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4.7 ★★★★★
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David C. Bright
Whiting, US
★★★★★ 5
A must-read - hair-raising, deeply alarming, and shudder-producing
Format: Kindle
What I liked: - Deeply researched - amazing depth, particularly of a wide range of characters (a few of whom are true heroes) and many more miscreants - Rachel must have had a spectacular research team to work with! She mentions that "there were millions of words written about the rise of (and fight against) fascism as it was happening in pre-World War II America" - but I bet that most Americans haven't been exposed to them. - Starts off mildly with George Sylvester Viereck (a ridiculous author, but just wait!) but then shifts gears progressively as the story builds and adds in a raft of odious characters - Not afraid to name names - some of the politicians ultimately come in for some serious whacking (see Sens. Wheeler and Langer especially). Also surprising were the back stories of names I recognize (architect Philip Johnson, for example) without knowing of their nazi sympathies and antisemitism. - Mr. and Mrs. Lindbergh are waaay more complicated than our stereotypes of the heroic but opaque pilot and his saintly wife (she is one scary piece of work!) - stuff I simply didn't know, and what was presented was alarming to the extent of making skin crawl - I had never heard of the sedition trials of 1943 and 1944 and prosecutor John Rogge at all before - just one example of new (and stunning) information from our history - absolute bedlam! - As the history advances and the book nears its end, there are several BIG events that may push you back in your reading chair several times - again, no spoilers, but hoo-eee! - The epilogue was a treat to read - again, I won't reveal any spoilers A minor criticism - the book is derived (I believe) from Rachel's podcasts, and thus the writing has her inimitable voice (pointed asides, etc.), but as a result may lack some polish and smoothness in the prose. Some may love it, some may carp, some may not even notice it. Whatever. If material about this period is of interest to the reader, be certain to seek out "Hitler in Los Angeles" by Steven J. Ross - its focus is a little narrower, dealing with Jewish undercover work to foil Nazi plotting in Los Angeles, but Leon Lewis, a true mensch and hero, is in Maddow's book as well.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 18, 2024
D
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David Simpson
Lexington, US
★★★★★ 4
Fascinating details from the past but not really a “prequel”
Format: Hardcover
Rachel Maddow’s “Prequel: An American Fight Against Fascism” recounts the efforts of pro-fascists in the United States, aided and manipulated by Nazi Germany, to keep America from actively opposing Hitler as well as to plot ways to turn America into a fascist country. The struggle to defeat those forces began in the early 1930s led by private citizens who, on their own, went undercover to join fascist groups and try to alert various government agencies about what was happening. A relatively small number of fascists gathered weapons to prepare for an insurrection. In the last chapters of the book, Maddow describes a 1944 trial in which the Justice Department brought sedition charges against some 30 defendants, most of whose activities she covered in previous chapters. The trial was chaotic, interrupted by frequent outbursts from the defendants and their lawyers. When the judge suddenly died one night of heart attack and a mistrial was declared, the Justice Department did not seek a new trial. The war against Hitler was nearing an end, so there was no push to revisit the past to pronounce judgment on those whose activities on the home front ultimately did not affect our victory over the Nazis. Since the ending is rather anticlimactic, Maddow, at times, may try a little too hard to make things sound more dire than they really were. Although elsewhere she has described Westbrook Pegler as an “extreme” right wing columnist and “pseudo-fascist,” she quotes him at the end of her chapter on Huey Long as averring that, in Louisiana, Long was “gradually copying the Hitler state.” Long was certainly a corrupt, authoritarian politician, but his populist politics had their origins in his upbringing in Winn Parish, where the Socialist Party carried the day in the 1912 election. Had he lived and had he run for president in 1936, he might have drawn enough votes from FDR to give the election to a Republican candidate, but he had no use for Nazism. (I live in Louisiana where, until 1973, we observed Huey’s birthday as a state holiday.) Maddow seems to imply that there was something nefarious about the death in 1940 of Senator Ernest Lundeen in a passenger airplane crash that occurred during a thunderstorm. Lundeen, who had close ties to a top Nazi spy, may have been under investigation, but nothing indicates that his presence on the flight had anything to do with the crash. The cause was never determined, but, based on the way the plane headed forcibly into the ground, a likely explanation is that it was caught in the kind of thunderstorm microbursts that we now know has caused similar crashes. Though, for me, the book seems to promise a bit more than it actually delivers, I did learn a lot about the ties of right wing politics to Nazism during that era. I was aware that Henry Ford was a fanatical antisemite, but, until I read Maddow’s book, I did not know that his efforts extended to publishing a ninety-two part series based on the Protocols of the Elders of Zion that appeared in the Dearborn Independent, a newspaper that he owned, with copies distributed to every Ford dealership. It was published in book form as “The International Jew” and widely circulated in Germany. Hitler praised Ford in “Mein Kampf” and, according to one account, had a portrait of Ford displayed on the wall in his office when he was visited by an American reporter. I was aware that the Nazis studied segregation in the American South for guidance in drafting their own race laws, but I didn’t know that Nazi Germany dispatched an attorney to the University of Arkansas School of Law to acquire first-hand knowledge. I was aware that Father Coughlin was a demagogic opponent of FDR, but I was not aware of the ferocity of his antisemitism or his ties to various pro-Nazi fascists. However, I was really totally unaware of the way actual Nazi agents in league with pro-Nazi Americans were able to get congressmen and senators to distribute Nazi propaganda, typically inserted into the Congressional Record and then sent to millions of Americans for free using the congressional franking privilege. On the other hand, I doubt that propaganda delivered in that manner was very effective. Pages from the Congressional Record could not compete with the message delivered by the 1939 Warner Brothers film “Confessions of a Nazi Spy,” the first anti-Nazi movie produced by Hollywood, based on actual events that Maddow describes. Nothing pro-fascists did in the United States affected our entry into the war against Germany. We went to war when Hitler himself declared war on us four days after Japan bombed Pearl Harbor. Nazi Germany certainly posed a military threat, but there wasn’t much danger that fascist politics would actually prevail in the United States. The political situation is very different today and, though I, like Maddow, admire the “smart, brave, determined, resourceful, self-sacrificing [anti-fascist] Americans who went before us,” I think the political challenges we face today are much more dire.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 11, 2023
G
Verified Purchase
Glenn T. Livezey
Birmingham, US
★★★★★ 5
The History of American fascism
Format: Hardcover
Quality and fierce journalism. Reviving and honoring adherence to a true history and context of American fascism
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 15, 2026
T
Verified Purchase
True Crime Reader
Belleville, US
★★★★★ 5
Well Researched and a Terrific Read
Format: Kindle
Thank you Rachel! I enjoyed this so much, it was an eye-opener. So much I didn't know.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 12, 2026
D
Verified Purchase
dmh65016
Lake Worth, US
★★★★★ 5
5 Star
Format: Hardcover
Rachel is a very fine writer.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 19, 2026

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