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Orders received during this time will be processed when we resume normal business hours on Thursday, January 2nd.

Thank YOU for another great year and we are looking forward to keeping you on the water in 2025!
Merry Christmas, Happy New Year and God Bless YOU!

PLEASE NOTE - Some products are not immediately available. If your order will be delayed, we will e-mail you or call you and let you know.
E-MAIL US HERE about availability and we will respond quickly! We ship same day if your order was placed by 1:00 PM EST during normal business hours BASED ON AVAILABILITY.
NEXT DAY SHIPPING NOTE - Please see our Shipping Policy SATURDAY OR SUNDAY DELIVERY IS NOT AN OPTION.

Thermostat 160 Degree Kit With All Gaskets Sierra® OEM Brand 18-3647

$38.89 $48.89


160 degree thermostat kit fits many different Mercruiser closed cooled marine engines.

  • Fits Mercruiser 3.0L 184 CID fresh water cooled engines from 1990 to 2010 with serial number range C856559 & up
  • Fits Mercruiser 3.0L 181CID fresh water cooled engines from 2008 to 2010 with serial number range A072812 & up
  • Fits Mercruiser 4.3L 262 V-6 fresh water cooled engines from 1996 to 1997 with serial number range 0F803800 to OK999999
  • Fits Mercruiser 230 GM 5.0L fresh water cooled engines with serial number range 0B525982 to 0F600999
  • Fits Mercruiser 260 GM 350 CID fresh water cooled engines with serial number range 0B525982 to 0F600999
  • Kit includes 18-3649 160 degree thermostat,18-2844 cover gasket, 18-2552 cover gasket, 18-2553 cover gasket, 18-7173 o-ring, 18-2917 housing gasket
  • Replaces Mercury 807252Q5, 807252T5
  • Replaces Mallory 9-43157

    We also have Quicksilver OEM Brand Item: QS-807252T5 CLICK HERE