Gasket Relief Valve - Mercury / Mariner 105-240 HP (1981-1982, 1988, 1990-1992, 1997-2000, 2003-2006) OEM# 27-78690 | WSM 540-28

Gasket Relief Valve Mercury / Mariner 105 - 240 Hp 76-06 OEM# 27-78690

This WSM gasket relief valve is a quality aftermarket replacement part designed for Mariner 6 Cyl 2.5L XS 200 and 28 other compatible models.

It replaces selected OEM reference numbers including 27-78690, 27-78690002, 67624, 78690002, G31990, M9-60057, S18-0936, S18-0936-9 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 31 listed fitments
• Replaces selected OEM reference numbers listed below

Product Details

• Brand: WSM
• WSM Part Number: 540-28
• Product: Gasket Relief Valve
• OEM Reference: 27-78690, 27-78690002, 67624, 78690002, G31990, M9-60057, S18-0936, S18-0936-9
• Application: Mariner 6 Cyl 2.5L XS 200 and 28 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 3.125 Bore 2L 135 – 2001-2004
• Mercury 6 Cyl 3.125 Bore 2L 150 – 1986-2000
• Mercury 6 Cyl 3.125 Bore 2L 175 – 1978-2005
• Mercury 6 Cyl 3.125 Bore 2L XR2 150 – 1976-1981
• Mercury 6 Cyl 3.375 Bore 2.4L 175 – 1986-1988
• Mercury 6 Cyl 3.375 Bore 2.4L 200 – 1981-1982
• Mercury 6 Cyl 3.375 Chrome Bore 2.4L 175 – 1978-1982
• Mercury 6 Cyl 3.375 Chrome Bore 2.4L 200 – 1983-1999
• Mercury Mercury – 1982-1990
• Mercury 6 Cyl 3.375 Steel Bore 2.4L XR-4 175 – 1987-1991
• Mercury 6 Cyl 3.501 Bore 2.5L 200 – 1991-1992
• Mercury 6 Cyl 3.501 Bore 2.5L EFI 150 – 1991-2005
• Mercury 6 Cyl 3.501 Bore 2.5L EFI 175 – 1992-2003
• Mercury 6 Cyl 3.501 Bore 2.5L EFI 200 – 1989-2004
• Mercury 6 Cyl 3.501 Bore 2.5L Jet 105 – 1989-2005
• Mercury 6 Cyl 3.501 Bore 2.5L Jet 140 – 1992-1999
• Mercury 6 Cyl 3.501 Bore 2.5L Optimax 115 – 1992-2000
• Mercury 6 Cyl 3.501 Bore 2.5L Optimax 135 – 2000
• Mercury 6 Cyl 3.501 Bore 2.5L Optimax 150 – 1998-2003
• Mercury 6 Cyl 3.501 Bore 2.5L Optimax 175 – 1998-2003
• Mercury 6 Cyl 3.501 Bore 2.5L Pro Max 150 – 2001-2004
• Mercury 6 Cyl 3.501 Bore 2.5L Pro Max 200 – 1994-1998
• Mercury 6 Cyl 3.501 Bore 2.5L Pro Max 225 – 1994-2006
• Mercury 6 Cyl 3.501 Bore 2.5L Sport Jet 175 – 1994-2004
• Mercury 6 Cyl 3.501 Bore 2.5L Sport Jet 200 – 1997-2006
• Mercury 6 Cyl 3.501 Bore 2.5L Sport Jet 210 – 2001-2006
• 6 Cyl 3.501 Bore 2.5L Sport Jet 240 – 2000-2005
• 6 Cyl 3.501 Bore 2.5L XRI 200 – 2000-2006
• 1992-1997
• 2001-2004

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
• O-Ring End Cap Mercury / Mariner / Mercruiser 70 - 240 Hp OEM# 25-54029 – 526-18
• O-Ring End Cap Mercury / Mariner / Mercruiser 90 - 485 Hp OEM# 25-62700 – 526-19
• Gasket Cork Mercury 105 - 300 Hp OEM# 27-11338 – 540-30

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