Thermostat Kit - Mercury 200-300 HP (2002-2007) OEM# 18-3606 | WSM 775-15-2K

Thermostat Kit Mercury 200 - 300 Hp OEM# 18-3606

This WSM thermostat kit is a quality aftermarket replacement part designed for Mercury 6 Cyl 3.6265 Bore 3L Optimax 200 and 4 other compatible models.

It replaces selected OEM reference numbers including 18-3606, 75-03606, 885599003, 885599004, 8855991, 8M0057307 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 20 listed fitments
• Replaces selected OEM reference numbers listed below

Product Details

• Brand: WSM
• WSM Part Number: 775-15-2K
• Product: Thermostat Kit
• OEM Reference: 18-3606, 75-03606, 885599003, 885599004, 8855991, 8M0057307
• Application: Mercury 6 Cyl 3.6265 Bore 3L Optimax 200 and 4 other compatible models

Product Fitment

This part is suitable for the following models:

• Mercury 6 Cyl 3.6265 Bore 3L Optimax 200 – 2003
• Mercury 6 Cyl 3.6265 Bore 3L Optimax 200 – 2004
• Mercury 6 Cyl 3.6265 Bore 3L Optimax 200 – 2005
• Mercury 6 Cyl 3.6265 Bore 3L Optimax 200 – 2006
• Mercury 6 Cyl 3.6265 Bore 3L Optimax 225 – 2002
• Mercury 6 Cyl 3.6265 Bore 3L Optimax 225 – 2003
• Mercury 6 Cyl 3.6265 Bore 3L Optimax 225 – 2004
• Mercury 6 Cyl 3.6265 Bore 3L Optimax 225 – 2005
• Mercury 6 Cyl 3.6265 Bore 3L Optimax 225 – 2006
• Mercury 6 Cyl 3.6265 Bore 3L Optimax 250 – 2004
• Mercury 6 Cyl 3.6265 Bore 3L Optimax 250 – 2005
• Mercury 6 Cyl 3.6265 Bore 3L Optimax 250 – 2006
• Mercury 6 Cyl 3.6265 Bore 3L Optimax 250 – 2007
• Mercury 6 Cyl 3.6265 Bore 3L Pro XS 225 – 2005
• Mercury 6 Cyl 3.6265 Bore 3L Pro XS 225 – 2006
• Mercury 6 Cyl 3.6265 Bore 3L Sport Jet 250 – 2002
• Mercury 6 Cyl 3.6265 Bore 3L Sport Jet 250 – 2003
• Mercury 6 Cyl 3.6265 Bore 3L Sport Jet 250 – 2004
• Mercury 6 Cyl 3.6265 Bore 3L Sport Jet 250 – 2005
• Mercury 6 Cyl 3.6265 Bore 3L Sport Jet 250 – 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:

• Belt Alternator Mercury / Mariner 200 - 250 Hp 6 Cylinder 98-14 OEM# 828507 – 830-210
• Oil Seal Crankshaft Mercury / Mariner 200 - 300 Hp 94-18 OEM# 26-830898 – 550-38T
• Gasket Relief Valve Mercury / Mariner / Mercruiser 135 - 300 Hp OEM# 27-88907 – 540-28-01
• Crankshaft Sealing Ring Mercury / Mariner 200 - 250 Hp 3L OEM# 816106 – 815-235U

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