O - Ring Cylinder Head - Mercury / Mariner 200-300 HP (2005-2006, 2008, 2014, 2017-2018) OEM# 25-884391 | WSM 505-53

O-Ring Cylinder Head Mercury / Mariner 200 - 300 Hp OEM# 25-884391

This WSM o-ring cylinder head is a quality aftermarket replacement part designed for Mercury 6 Cyl 3.625 Bore 3L EFI 225 and 11 other compatible models.

It replaces selected OEM reference numbers including 25-884391 and is suitable for service, repair and rebuild work.

Key Features

• Quality aftermarket replacement part from WSM
• Engineered for dependable fit, function and service life
• Designed for marine and powersports repair and maintenance
• Compatible with 13 listed fitments
• Replaces selected OEM reference numbers listed below

Product Details

• Brand: WSM
• WSM Part Number: 505-53
• Product: O-Ring Cylinder Head
• OEM Reference: 25-884391
• Application: Mercury 6 Cyl 3.625 Bore 3L EFI 225 and 11 other compatible models

Product Fitment

This part is suitable for the following models:

• Mercury 6 Cyl 3.625 Bore 3L EFI 225 – 2003-2008
• Mercury 6 Cyl 3.625 Bore 3L EFI 250 – 2002-2008
• Mercury 6 Cyl 3.625 Bore 3L Pro Max 300 – 2002-2008
• Mercury 6 Cyl 3.6265 Bore 3.2L XS 300 – 2002-2005
• Mercury 6 Cyl 3.6265 Bore 3L Optimax 200 – 2006-2017
• Mercury 6 Cyl 3.6265 Bore 3L Optimax 225 – 2003-2018
• Mercury 6 Cyl 3.6265 Bore 3L Optimax 250 – 2003-2018
• Mercury 6 Cyl 3.6265 Bore 3L Optimax 300 – 2003-2014
• Mercury 6 Cyl 3.6265 Bore 3L Pro XS 200 – 2015-2018
• Mercury Mercury – 2007-2018
• Mercury 6 Cyl 3.6265 Bore 3L Pro XS 250 – 2004-2018
• 6 Cyl 3.6265 Bore 3L Sport Jet 250 – 2006-2018
• 2002-2006

Why Buy WSM

WSM is a trusted manufacturer of aftermarket marine and powersports parts, known for dependable quality, strong fitment coverage and workshop-ready replacement components.

You May Also Need

Browse related parts for compatible models:

• Wires Ignition Mercury / Mariner 30 - 300 Hp CDM 99-18 OEM# 84-821945T65 – 368-7126
• O-Ring Temperature Sensor Mercruiser / Mercury / Yamaha 30 - 350 Hp / 1000 / 1100 OEM# 25-805063 – 526-07
• O-Ring End Cap Mercury / Mariner 200 - 300 Hp OEM# 25-855426 – 526-11
• Bearing Reverse Gear Mercury / Mariner / Mercruiser / Yamaha 110 - 300 Hp OEM# 31-88957T – 447-308

Please use the fitment guide, OEM references and images to confirm this is the correct part before ordering.