Mercury Quicksilver Heavy-Duty Water Pump Kit 8M0137849 — 15 & 20 HP EFI FourStroke
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Mercury Quicksilver Heavy-Duty Water Pump Kit — OEM 8M0137849 | 15 & 20 HP EFI FourStroke
This genuine OEM water pump kit is Mercury’s heavy-duty option for selected 15 HP and 20 HP EFI FourStroke outboards built from serial number 0R833820 and up. Where the standard water pump kit uses conventional components, 8M0137849 steps up with a heavy-duty face plate and housing specifically designed to extend service life in silty, sandy, or otherwise abrasive water conditions. If your engine operates in challenging water quality, this is the right kit to reach for at service time.
Part Information
- OEM Part Number: 8M0137849
- Brand: Mercury / Quicksilver
- Official Product Type: Water pump / impeller service kit — heavy-duty
- Serial Range: 0R833820 and above
- Design: Heavy-duty face plate and housing for abrasive-water conditions
- System: Raw-water cooling / lower unit water pump assembly
- GTIN / UPC: 745061045323
Compatible Applications
- Mercury 15 HP EFI FourStroke — serial 0R833820 and above
- Mercury 20 HP EFI FourStroke — serial 0R833820 and above
- Confirm engine horsepower and serial number before ordering — engines below serial 0R833820 use a different water pump configuration
- For a complete water pump rebuild kit on this engine, also see 8M0135821 — verify which kit is correct for your service requirement
Related Parts
When to Replace
- At the scheduled impeller replacement interval (every 2 years or 200 hours per Mercury’s maintenance schedule)
- When cooling-water output from the tell-tale is weak or absent
- When overheating is suspected or a temperature warning is triggered
- When the impeller shows cracking, hardening, missing vanes, or deformation on inspection
- Engines operating in silty or sandy water should be inspected more frequently
Service Interval
Mercury recommends inspecting and replacing the water pump impeller every 2 years or 200 hours of operation, whichever comes first. In abrasive water conditions — the primary use case for this heavy-duty kit — annual inspection is strongly recommended.
Installation Notes
- Remove the lower unit per the applicable Mercury service procedure before accessing the water pump
- Clean all mating surfaces and inspect related seals and pump components for wear before reassembly
- Confirm correct impeller orientation — incorrect orientation reduces water flow
- Inspect the water tube and grommet for wear or damage while the pump is apart
- Verify tell-tale water flow after reassembly before returning to service
Technical FAQ
What is the difference between 8M0137849 and 8M0135821?
8M0137849 is the heavy-duty water pump kit with an upgraded face plate and housing for abrasive water conditions. 8M0135821 is a separate water pump repair kit for the same engine family. The two kits are not identical — confirm which is appropriate for your service requirement and operating conditions.
Why choose the heavy-duty version over a standard kit?
If the engine operates regularly in silty, sandy, or turbid water, the heavy-duty face plate and housing in 8M0137849 are designed to resist wear better than standard components, extending the service life of the water pump between service intervals.
Is this kit compatible with earlier 15/20 HP FourStroke engines?
No. 8M0137849 is specified for serial 0R833820 and above. Engines below this serial number use a different water pump configuration and require a different kit.
Parts Desk Insights
The heavy-duty designation is the key selling point for 8M0137849 — it’s the right recommendation any time a customer with a 15 or 20 HP EFI FourStroke mentions that they operate in rivers, estuaries, tidal flats, or other silty environments. Standard impeller kits wear out faster in abrasive conditions, and customers who have had to replace an impeller early are usually receptive to the upgrade. The most important fitment check is the serial number — the 0R833820 break is the same cutoff as the thermostat we see on these engines, so it’s a reliable identifier for the newer engine configuration. Browse the full Mercury Cooling System Parts collection for thermostats, housings, and related components.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.