Description

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Alternate/Superseded Part Numbers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 Related and superseded references include 27-33146 and 27-856704.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.