Gasket Relief Valve - Mercury / Mariner / Mercruiser 135-300 HP (1981-1982, 1988, 1990-1991, 1994, 2001-2002, 2004, 2006, 2008, 2014, 2017-2018) OEM# 27-88907 | WSM 540-28-01

Gasket Relief Valve Mercury / Mariner / Mercruiser 135 - 300 Hp OEM# 27-88907

This WSM gasket relief valve is a quality aftermarket replacement part designed for Mariner 6 Cyl 250 and 25 other compatible models.

It replaces selected OEM reference numbers including 27-88907, 27-88907003 and is suitable for service, repair and rebuild work.

Key Features

• Quality replacement gasket designed for dependable sealing performance
• Ideal for service, repair and engine rebuild work
• Manufactured for fit, durability and reliable installation
• Compatible with 29 listed fitments
• Replaces selected OEM reference numbers listed below

Product Details

• Brand: WSM
• WSM Part Number: 540-28-01
• Product: Gasket Relief Valve
• OEM Reference: 27-88907, 27-88907003
• Application: Mariner 6 Cyl 250 and 25 other compatible models

Product Fitment

This part is suitable for the following models:

• Mariner 6 Cyl 250 – All Years
• Mercruiser 6 Cyl 275 – All Years
• Mercury 6 Cyl 3.125 Bore 2L 135 – 1989-1990
• Mercury 6 Cyl 3.125 Bore 2L 150 – 1989-1994
• Mercury 6 Cyl 3.125 Bore 2L 175 – 1986-1988
• Mercury 6 Cyl 3.125 Bore 2L XR2 150 – 1978-1988
• Mercury 6 Cyl 3.375 Bore 2.4L 175 – 1976-1981
• Mercury 6 Cyl 3.375 Bore 2.4L 200 – 1986-1988
• Mercury Mercury – 1981-1982
• Mercury 6 Cyl 3.375 Chrome Bore 2.4L 200 – 1978-1982
• Mercury 6 Cyl 3.375 Chrome Bore 2.4L 220 – 1983-1988
• Mercury 6 Cyl 3.625 Bore 3L 225 – 1982-1988
• Mercury 6 Cyl 3.625 Bore 3L EFI 200 – 1987-1991
• Mercury 6 Cyl 3.625 Bore 3L EFI 225 – 1994-2001
• Mercury 6 Cyl 3.625 Bore 3L EFI 250 – 2002-2008
• Mercury 6 Cyl 3.625 Bore 3L Pro Max 300 – 1995-2008
• Mercury 6 Cyl 3.625 Bore 3L XB 250 – 1995-2008
• Mercury 6 Cyl 3.6265 Bore 3.2L XS 300 – 1998-2002
• Mercury 6 Cyl 3.6265 Bore 3L Optimax 200 – 2000-2004
• Mercury 6 Cyl 3.6265 Bore 3L Optimax 225 – 2007-2017
• Mercury 6 Cyl 3.6265 Bore 3L Optimax 250 – 1997-2018
• Mercury 6 Cyl 3.6265 Bore 3L Pro XS 200 – 1998-2018
• Mercury 6 Cyl 3.6265 Bore 3L Pro XS 225 – 2003-2014
• Mercury 6 Cyl 3.6265 Bore 3L Pro XS 250 – 2007-2018
• Mercury 6 Cyl 3.6265 Bore 3L Sport Jet 250 – 2005-2018
• 6 Cyl 3L Carb Sea Pro 225 – 2006-2018
• 2002-2006
• 1995-2001
• 1998-2018

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:

• O-Ring Crankshaft Chrysler / Force / Mercury / Mariner / Mercruiser / Yamaha 6 - 300 Hp OEM# 25-90011 – 526-13
• O-Ring Oil Pump Mercruiser / Mercury / Mariner 30 - 300 Hp 90-21 OEM# 25-48462 – 526-22
• Oil Seal Crankshaft Mercury / Mariner 200 - 300 Hp 94-18 OEM# 26-830898 – 550-38T
• 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.