Mercury MerCruiser Water Pump to Gear Housing Gasket - 27-85610
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The Mercury MerCruiser Quicksilver Water Pump to Gear Housing Gasket 27-85610 is an OEM-style base sealing gasket used between the lower water pump body and the top surface of the lower gearcase housing. It helps seal the water pump base so cooling water is directed properly through the pump and up toward the engine.
Key Features
- Genuine Mercury/Quicksilver water pump base gasket
- Part numbers: 27-85610 and 27-85610-1
- Also referenced as 85610
- Installs between the water pump body and gear housing
- Helps prevent cooling-water leakage at the pump base
- Used in select Mercury outboard and MerCruiser sterndrive lower-unit water pump assemblies
Engine & Drive Compatibility
Used on select Mercury / Mariner outboards and MerCruiser sterndrives, including many Alpha One Gen 1 style water pump assemblies and compatible 2.5L, 3.0L, 4.3L, 5.0L, 5.7L, 7.4L, and 8.2L MerCruiser applications. Also used on select Mercury / Mariner inline-6 and V6 outboards, including 90 HP, 115 HP, 150 HP, 175 HP, and 200 HP configurations where this gasket is shown in the water pump diagram.
Serial Number Fitment Notice
Verify fitment by engine or drive serial number and water pump parts diagram before ordering. Water pump gasket fitment can vary by gearcase generation, pump housing style, impeller kit, and production range.
When This Part Needs Replacement
Replace this gasket whenever the water pump is serviced, removed, or rebuilt. Also replace it if there are signs of tearing, compression, leakage, corrosion, or poor sealing at the pump base.
Installation Notes
Clean the top of the gear housing and water pump base before installation. Do not reuse a compressed or torn gasket. Inspect the impeller, pump housing, wear plate, guide tube, seals, and related gaskets during service.
Alternate/Superseded Part Numbers
Primary Mercury references: 27-85610, 27-85610-1, and 85610. Related and superseded references include 27-33146 and 27-856704. Also cross-referenced with OMC / Johnson Evinrude 508834.
Parts Desk Insight
Water pump gaskets are low-cost parts that do important work. If the pump is already apart, replacing the gasket helps prevent cooling-water loss and avoids reopening the lower unit for a small seal failure.
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.