New Marine Water Pump Base O-Ring Compatible With 1970-2006 Mercury Mariner Mercruiser Omc Johnson

WATER PUMP BASE O-RING — MULTI-BRAND MARINE APPLICATION:

1.984 I.D. x 0.139 WIDTH (~51MM × 3.4MM) — WATER PUMP SERVICE O-RING:
Per Mercury Marine documentation, OEM 25-33145 is identified as the WATER PUMP O-RING. Per Crowley Marine, this is the Water Pump Base O-Ring. Used during routine water pump impeller service across an extensive multi-brand marine engine lineup spanning 1970-2006.

CHRYSLER/FORCE OUTBOARD APPLICATIONS:
• Chrysler/Force 9.9 HP 2-Cyl Outboard (1998)
• Chrysler/Force 15 HP 2-Cyl Outboard (1998)

JOHNSON/EVINRUDE OUTBOARD APPLICATIONS:
• Johnson/Evinrude 2 HP 1-Cyl Outboard (2001)
• Johnson/Evinrude 3 HP 1-Cyl Outboard (2001-2006)
• Johnson/Evinrude 3 HP 2-Cyl Outboard (1987-1997)
• Johnson/Evinrude 4 HP 2-Cyl Outboard (1981-2001)

MERCURY 4-STROKE SMALL OUTBOARD APPLICATIONS:
• Mercury 8 HP 2-Cyl 4-Stroke Outboard (1995-2006)
• Mercury 9.9 HP 2-Cyl 4-Stroke Outboard (1995-2006)
• Mercury 25 HP 2-Cyl 4-Stroke Outboard (1998)

MERCURY 2-STROKE SMALL OUTBOARD APPLICATIONS:
• Mercury 6 HP 2-Cyl Outboard (1986-2004)
• Mercury 8 HP 2-Cyl Outboard (1994-2006)
• Mercury 9.9 HP 2-Cyl Outboard (1994-2006)
• Mercury 10 HP 2-Cyl Outboard (1994-2005)

MERCURY SPORT JET APPLICATIONS:
• Mercury Sport Jet 90 HP 3-Cyl 3.375 Bore (1993-1995)
• Mercury Sport Jet 95 HP 3-Cyl 3.375 Bore (1996-1997)
• Mercury Sport Jet 120 HP 4-Cyl 3.375 Bore (1995-1998)

MERCURY 4-CYL CROSS FLOW APPLICATIONS:
• Mercury 65 HP 4-Cyl Outboard (1970-1971)
• Mercury 75 HP 4-Cyl 2.875 Cross Flow Outboard (1984-1986)
• Mercury 80 HP 4-Cyl 2.875 Cross Flow Outboard (1978-1982)
• Mercury 85 HP 4-Cyl 2.875 Cross Flow Outboard (1973-1977)

MERCURY V6 CROSS FLOW VINTAGE (2.875 BORE):
• Mercury 90 HP V6 Cross Flow Outboard (1978-1988)
• Mercury 115 HP V6 Cross Flow Outboard (1973-1988)
• Mercury 140 HP V6 Cross Flow Outboard (1978-1981)
• Mercury 150 HP V6 Cross Flow Outboard (1973-1978)

MERCURY V6 2.0L (3.125 BORE):
• Mercury 150 HP V6 2L Outboard (1978-1988)
• Mercury 175 HP V6 2L Outboard (1976-1981)
• Mercury XR2 150 HP V6 2L Outboard (1986-1988)

MERCURY V6 2.4L (3.375 BORE):
• Mercury 175 HP V6 2.4L Outboard (1981-1982)
• Mercury 200 HP V6 2.4L Outboard (1978-1982)
• Mercury 225 HP V6 2.4L Outboard (1980-1981)
• Mercury 175 HP V6 2.4L Chrome Bore Outboard (1983-1988)
• Mercury 200 HP V6 2.4L Chrome Bore Outboard (1982-1988)

MARINER, MERCRUISER, OMC I/O APPLICATIONS:
• All Mariner Models Requiring OEM 25-33145 by Part Number Match
• All MerCruiser Models Requiring OEM 25-33145 / 25-32424
• All OMC I/O Models Requiring OEM 0302337 / 3852044

O-RING SPECIFICATIONS:
• Inside Diameter: 1.984 Inch (51.4 mm)
• Width / Cross-Section: 0.139 Inch (3.4 mm)
• Material: Nitrile (NBR) Standard Marine Grade Rubber
• Color: Black
• Type: Water Pump Base O-Ring Seal

FUNCTIONAL APPLICATION — WATER PUMP / GEARCASE SERVICE:
Per Mercury Marine and Crowley Marine documentation, this O-ring is identified as the Water Pump Base O-Ring used in the lower unit / gearcase water pump assembly. Routinely-replaced wear part during impeller service. Used across an extensive multi-brand marine engine lineup spanning 36 years (1970-2006) covering Mercury, Mariner, MerCruiser, Johnson/Evinrude (OMC/BRP), Chrysler/Force, Volvo Penta, and OMC I/O applications.

SERVICE WHEN:
• Replacing Water Pump Impeller (Routine Service)
• Annual Maintenance (Saltwater Use)
• Lower Unit / Gearcase Service
• Diagnosing Cooling System Issues
• Rebuilding Water Pump Assembly

FITMENT NOTE:
This is an OEM-spec replacement Water Pump Base O-Ring with extensive cross-application across multiple brands. ALWAYS verify the correct OEM part number from your service manual before ordering — confirming Mercury 25-33145, OMC 0302337, Volvo Penta 3852044, or MerCruiser 25-32424 is the specified part for your application.