O - Ring Cylinder Head - Mercury / Mariner 110-240 HP V6 2.5L (2000, 2004-2006, 2010, 2012-2014, 2018) OEM# 859772 | WSM 526-25

O-Ring Cylinder Head Mercury / Mariner 110 - 240 Hp V6 2.5L OEM# 859772

This WSM o-ring cylinder head is a quality aftermarket replacement part designed for Mariner 6 Cyl 2.5L XS 200 and 18 other compatible models.

It replaces selected OEM reference numbers including 859772, 8597721 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 21 listed fitments
• Replaces selected OEM reference numbers listed below

Product Details

• Brand: WSM
• WSM Part Number: 526-25
• Product: O-Ring Cylinder Head
• OEM Reference: 859772, 8597721
• Application: Mariner 6 Cyl 2.5L XS 200 and 18 other compatible models

Product Fitment

This part is suitable for the following models:

• Mariner 6 Cyl 2.5L XS 200 – All Years
• Mercury 6 Cyl 3.501 Bore 2.5L 135 – 2001-2006
• Mercury 6 Cyl 3.501 Bore 2.5L 200 – 2000
• Mercury 6 Cyl 3.501 Bore 2.5L EFI 150 – 2000-2005
• Mercury 6 Cyl 3.501 Bore 2.5L EFI 175 – 2000-2010
• Mercury 6 Cyl 3.501 Bore 2.5L EFI 200 – 2000-2004
• Mercury 6 Cyl 3.501 Bore 2.5L Jet 110 – 2000-2006
• Mercury 6 Cyl 3.501 Bore 2.5L Jet 140 – 2006-2013
• Mercury 6 Cyl 3.501 Bore 2.5L Optimax 115 – 2000-2005
• Mercury Mercury – 2000
• Mercury 6 Cyl 3.501 Bore 2.5L Optimax 150 – 2000-2012
• Mercury 6 Cyl 3.501 Bore 2.5L Optimax 175 – 2000-2014
• Mercury 6 Cyl 3.501 Bore 2.5L Pro Max 225 – 2001-2014
• Mercury 6 Cyl 3.501 Bore 2.5L Sport Jet 175 – 2002-2004
• Mercury 6 Cyl 3.501 Bore 2.5L Sport Jet 200 – 2000-2006
• Mercury 6 Cyl 3.501 Bore 2.5L Sport Jet 210 – 2001-2006
• Mercury 6 Cyl 3.501 Bore 2.5L Sport Jet 240 – 2010
• 6 Cyl 3.6265 Bore 2.5L Pro XS 150 – 2000-2005
• 6 Cyl 3.6265 Bore 2.5L Pro XS 175 – 2000-2006
• 2010-2018
• 2008-2018

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:

• Divider Plate Seal Mercury / Mariner 105 - 240 Hp 76-18 OEM# 26-814754 – 540-35
• Gasket Relief Valve Mercury / Mariner 105 - 240 Hp 76-06 OEM# 27-78690 – 540-28
• O-Ring End Cap Mercury / Mariner / Mercruiser 90 - 485 Hp OEM# 25-62700 – 526-19
• Gasket Divider Plate Mercury / Mariner 110 - 240 Hp OEM# 27-190506 – 521-32

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