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Mercury Mariner 7.5-200hp Thermostat - 143 Degrees Fahrenheit (OST756)

Genuine Part # : 75692, 18-3553

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  • 1 YEAR


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Thermostat opens at 143 degrees fahrenheit.

This part replaces part #: 75692, 18-3553.

This part suits the following engines:
Mercury Mariner 7.5hp 1979-1985 serial # 5226935 & up,
Mercury Mariner 9.8hp 1979-1985 serial # 5206550 & up,
Mercury Mariner 40hp 1973-1989 serial # 3336258 to C159199,
Mercury Mariner 50-60hp 1992-1996 serial # D000750 to OG290584,
Mercury Mariner 65hp 1973-1977 serial # 3547987 to 4571651,
Mercury Mariner 70hp 1977-1978 serial # 4571652 to 4825248,
Mercury Mariner 70-90hp 1987-1990 serial # A996142 to OC222000,
Mercury Mariner 100-115hp 1988-1993 serial # B209468 to OD283221,
Mercury Mariner V135hp 1987-2001 serial # A904646 to OT178499,
Mercury Mariner V150hp 1987-2014 serial # A904646 to current,
Mercury Mariner V175hp 1990-2006 serial # C100861 to OT800999,
Mercury Mariner V200hp 1978-2014 serial # 6435503 to current.


About The Brand

Outboard Spares brand of parts are tested in Australia's harsh marine environment with a focus on quality and durability. Outboard Spares parts are used by professional fishermen who depend on their parts to stay on the water and in business. So next time you service your engine choose what the professionals use, choose Outboard Spares.

  • Standard Shipping is free on all orders. Oils & Lubricant products can only be sent via Standard Shipping.
  • Express Shipping is $10 flat rate.
  • Pick up is available from our warehouse at 1/84 Brunel Road, Seaford VIC 3198 between the hours of 8:30am to 3:30pm weekdays. You will be notified by email when your order is ready for pick up.

Delivery Time

Orders are dispatched same business day if ordered before 3:00pm AEDT. All orders are dispatched from Melbourne, Victoria and are sent via Australia Post.

For delivery time estimates with Australia Post please use their delivery calculator here:

If you have any questions relating to shipping, please contact us by emailing

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