Mercury Quicksilver Water Pump Repair Kit 8M0155395 — 4–60 HP FourStroke Outboard
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Mercury Quicksilver Water Pump Repair Kit — OEM 8M0155395 | 4–60 HP FourStroke Outboard
Keep your Mercury FourStroke outboard running cool with this genuine OEM water pump repair kit. Part 8M0155395 contains everything needed to fully rebuild the water pump on selected Mercury 4–60 HP FourStroke outboards built from serial number 0R411838 and up — impeller, key, wear plate, housing, gaskets, and hardware all in one OEM package. Replacing the impeller on schedule is one of the most important things you can do to prevent overheating and engine damage on any outboard.
Part Information
- OEM Part Number: 8M0155395
- Brand: Mercury / Quicksilver
- Official Product Type: Water pump / impeller repair kit
- Supersedes: 16159A03
- Earlier Related Kit: 16159A1
- Serial Range: 0R411838 and above
- System: Raw-water cooling / water pump assembly
- GTIN / UPC: 745061116313
Kit Contents
- Water pump impeller
- Impeller drive key
- Impeller gaskets
- Wear plate
- Water pump housing / cup
- Hardware and washers
Compatible Applications
- Mercury FourStroke 4 HP — serial 0R411838 and up
- Mercury FourStroke 5 HP — serial 0R411838 and up
- Mercury FourStroke 6 HP — serial 0R411838 and up
- Selected Mercury 4–60 HP FourStroke outboards using this water-pump configuration — serial 0R411838 and up
- Confirm engine horsepower and serial number before ordering — engines below serial 0R411838 may require an earlier kit (16159A03 or 16159A1)
- This kit is for Mercury FourStroke outboards only — not for MerCruiser sterndrive water pumps
When to Replace
- At the scheduled impeller replacement interval (every 2 years or 200 hours, per Mercury owner’s manual)
- When cooling-water output from the tell-tale is weak or absent
- When overheating is suspected or a temperature warning has been triggered
- When the water pump is disassembled for any reason — impeller and gaskets should not be reused
- When the impeller shows cracking, hardening, missing vanes, or deformation on inspection
Service Interval
Mercury recommends inspecting and replacing the water pump impeller every 2 years or 200 hours of operation, whichever comes first. Proactive replacement during annual service is strongly recommended — impeller failure is one of the most common causes of outboard overheating.
Installation Notes
- Inspect the driveshaft, water-pump base, housing sealing surfaces, and water tube for wear or damage while the pump is disassembled
- Install the impeller key, gaskets, wear plate, cup, and housing in the correct sequence per the Mercury service manual
- Confirm impeller vane orientation — incorrect orientation will result in reduced water flow
- Follow Mercury-specified fastener torque values during reassembly
- After reassembly, verify tell-tale water flow before returning the engine to service
Technical FAQ
What is the serial number cutoff for this kit?
8M0155395 is specified for Mercury FourStroke outboards from serial 0R411838 and up. Engines below this serial number use an earlier water-pump configuration and require kit 16159A03 or 16159A1. Always confirm the serial number before ordering.
Does this kit include the water pump housing?
Yes. The kit includes the impeller, key, wear plate, housing/cup, gaskets, and hardware — all components required for a complete water pump rebuild.
Is this kit compatible with MerCruiser sterndrives?
No. This kit is specific to Mercury FourStroke outboards in the 4–60 HP range. MerCruiser sterndrive water pumps use different configurations and part numbers.
Parts Desk Insights
Water pump service is one of the most skipped maintenance items on small outboards, and it’s one of the most consequential. The most common scenario is a customer who notices the tell-tale stream has gotten thin or intermittent and waits too long to act — by the time they come in, the impeller vanes have already broken down and debris may have entered the cooling passages. The key fitment point for this kit is the 0R411838 serial break — this catches customers who have an older engine and assume they can order the newest kit. 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.