Mercury Housing Water Pump 888686T
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Mercury MerCruiser Quicksilver 888686T is a genuine OEM water pump housing used in selected Mercury Marine cooling-system applications. Current parts listings identify 888686T as Housing, Water Pump.
This part is the pump housing portion of the water-pump assembly and is intended to restore the correct water-pump cavity and cooling-water flow path when the original housing is worn, damaged, or being replaced during pump service. Mercury's official parts-catalog guidance is to confirm application by engine model or serial number before ordering.
Key Features
- Genuine Mercury MerCruiser Quicksilver OEM part
- Part number: 888686T
- Official description: Housing, Water Pump
- Used in selected Mercury Marine water-pump assemblies
- Genuine factory part listing is consistent across current OEM Mercury parts sources.
Engine Compatibility
Current public source coverage for 888686T is limited and inconsistent at the engine-list level. One current OEM-parts listing ties it to 225 EFI (4-Stroke) serial 0T653945 and up, while Mercury's official guidance remains to verify the exact fit through the Mercury Parts Catalog using the engine model or serial number.
Serial Number Fitment Notice
Fitment should always be confirmed by engine serial number before ordering. Mercury's official parts catalog specifically directs users to search by engine model or serial number to view the correct diagrams and part numbers.
When This Part Needs Replacement
Replace this water pump housing when:
- the housing is scored or worn internally
- overheating or weak water flow points to pump-housing wear
- the water-pump assembly is being rebuilt and the housing shows damage
- corrosion or deformation affects sealing or impeller operation
Installation Notes
- Confirm exact fitment by serial number first.
- Inspect the impeller, wear plate, seals, and related pump hardware during service.
- One current listing describes 888686T as a housing kit supplied without gaskets, so package contents should be checked before order fulfillment.
- Follow Mercury service procedures for the specific engine application.
Alternate/Superseded Part Numbers
Current reviewed sources identify 888686T as the active part number.
Parts Desk Insight
On water-pump jobs, the housing matters just as much as the impeller when wear is present. Replacing only the rubber impeller in a worn housing can leave cooling performance below where it should be, so this is the kind of part worth checking closely during any complete pump service.
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 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.