Mercury-Mercruiser 25-54029 2.8 x .103 O-Ring

Mercury 25-54029 Powerhead O-Ring - 2.800" x .103"

The Mercury 25-54029 Powerhead O-Ring is a genuine OEM replacement O-ring for select Mercury outboard powerhead applications. This O-ring measures 2.800 inches x .103 inches and is used as an upper or lower powerhead O-ring where specified by the Mercury parts diagram or service manual.

Powerhead O-rings help create a proper seal between mating engine components where specified. Replacing a worn, flattened, cracked, swollen, or leaking O-ring during powerhead service helps support proper sealing and reliable outboard operation.

Product Features:

• Genuine OEM Mercury powerhead O-ring
• Replacement powerhead O-ring for select Mercury outboards
• Measures 2.800 in. x .103 in.
• Used as an upper or lower O-ring depending on application
• Helps replace a worn, flattened, cracked, swollen, or leaking original O-ring
• Direct replacement where part number 25-54029 is specified
• Built to Mercury Marine fit, function, and performance standards

Product Details:

• Brand: Mercury
• Manufacturer Part Number: 25-54029
• Part Type: Powerhead O-Ring
• Dimensions: 2.800 in. x .103 in.
• Application: Select Mercury outboard powerhead applications

Lower O-Ring Applications:

• 70 HP 3-cylinder outboards, serial number 0B240451 and up
• 80 HP 3-cylinder outboards, serial number 0B240451 and up
• 90 HP 3-cylinder outboards, serial number 0B240451 through 0C221999

Upper O-Ring Applications:

• V-105 Jet outboards, serial number 0D082000 and up
• V-135 carbureted outboards with 1.50 ID upper bearing, serial number 0A904646 through 0C100860
• V-135 carbureted outboards with 1.37 ID upper bearing, serial number 0A904646 through 0C100860
• V-135 carbureted outboards, serial number 0C100861 and up
• V-135 carbureted outboards, serial number 0C239553 and up
• V-135 DFI outboards, serial number 0G590000 and up
• V-140 Jet outboards, serial number 0D082000 and up
• V-150 carbureted outboards with 1.50 ID upper bearing, serial number 0A904646 through 0C100860
• V-150 carbureted outboards with 1.37 ID upper bearing, serial number 0A904646 through 0C100860
• V-150 carbureted outboards, serial number 0C100861 through 0C239552
• V-150 XR4 / Magnum II outboards, serial number 0B242885 through 0C239552
• V-150 carbureted outboards, serial number 0C239553 and up
• V-150 XR4 / 6 / Magnum II / Magnum III outboards, serial number 0C239553 and up
• V-150 EFI outboards, serial number 0D082000 and up
• V-150 DFI outboards, serial number 0G590000 and up
• V-175 carbureted outboards, serial number 6618751 through 0C239552
• V-175 carbureted outboards, serial number 0C239553 and up
• V-175 EFI outboards, serial number 0D000750 and up
• V-200 carbureted outboards, serial number 6073192 through 0C291519
• V-200 carbureted outboards, serial number 0C291520 and up
• V-200 EFI outboards, serial number 0C100861 through 0C291519
• V-200 EFI 2.5L outboards, serial number 0C291520 and up
• V-200 Laser outboards, serial number 0B117316 and up

Service Note: Follow your Mercury service manual for powerhead removal, O-ring location, sealing surface inspection, lubrication requirements, O-ring installation, fastener torque, and final leak inspection for your specific outboard.

Fitment Note: Powerhead O-ring fitment should be verified by outboard model, horsepower, serial number, upper or lower O-ring location, bearing configuration where applicable, parts diagram, and existing O-ring part number before ordering. Please confirm this 2.800 inch x .103 inch powerhead O-ring is correct for your Mercury outboard before purchasing.

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