OEM PART NUMBERS:
Mercury: 27-892319001 / 892319001
Mercury: 825231 / 27-825231
Mercury: 859352 / 27-859352
Mercury: 27-8M0163129 (supersedes 27-892319001)
Mercury: 27-8M0213112 (latest supersession)

SPECIFICATIONS:
Type: Powerhead Base Gasket
Engine Power: 40 - 60 HP
Engine Type: 4-Stroke EFI
Cylinder Configuration: 3 and 4 Cylinder
Position: Between Powerhead and Crankcase
Condition: New

APPLICATIONS:
Mercury 40 HP EFI 4-Stroke (3 Cylinder)
Mercury 50 HP EFI 4-Stroke (4 Cylinder)
Mercury 60 HP EFI 4-Stroke (4 Cylinder)
Mariner 40 HP EFI 4-Stroke (3 Cylinder)
Mariner 50 HP EFI 4-Stroke (4 Cylinder)
Mariner 60 HP EFI 4-Stroke (4 Cylinder)
Verify by serial number — Mercury does not use model years for parts lookup

⚠️ Verify OEM part number and engine serial number from your original unit before ordering to ensure proper fitment.

Base Gasket — Mercury Mariner 40/50/60 HP 4-Stroke EFI Outboard
Replacement powerhead base gasket engineered for Mercury and Mariner 40 through 60 HP 4-stroke EFI outboard engines. Compatible with both 3-cylinder and 4-cylinder powerhead configurations. This gasket sits between the cylinder block and the crankcase to maintain a sealed joint that prevents compression blowby, oil seepage, and water intrusion. A deteriorated base gasket can cause hard starting, rough idle, loss of power, and external oil leaks at the powerhead base. Constructed from marine-grade gasket material for long-term durability in saltwater and freshwater environments. Always verify your engine serial number and original OEM part number before ordering. Replaces Mercury 859352, 825231, and 27-892319001.