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  • Sherwood Replacement Impellers

    Sherwood Replacement Impellers

    Sherwood impellers for marine applications such as water pumps and bilge pumps. Use Neoprene...

    In Stock 

    Price: $25.95 to $178.45
  • Vetus 330 Cooling Water Strainers

    Vetus 330 Cooling Water Strainers

    Vetus Type 330 raw water strainers filter seawater before it is fed into the cooling system of...

    In Stock 

    Price: $25.04 to $106.38
  • Jabsco Replacement Pump Impellers

    Jabsco Replacement Pump Impellers

    Jabsco replacement neoprene and nitrile impellers for engine cooling, water, bilge, and transfer pum...

    In Stock 

    Price: $26.13 to $169.81
  • Vetus Anti Syphon Device with Valve

    Vetus Anti Syphon Device with Valve

    Vetus airvent ASD is an anti-siphon loop with valve necessary for engine coolant plumbing. Uses a...

    In Stock 

    Price: $65.66
  • Jabsco Mercruiser Type Engine Cooling Pump

    Jabsco Mercruiser Type Engine Cooling Pump

    Replacement for stock cast-iron, plastic and aluminum composite water pumps. Made of bronze and...

    In Stock 

    Price: $61.38 to $667.88
  • Jabsco 7420 Series Flexible Impeller Pump

    Jabsco 7420 Series Flexible Impeller Pump

    Jabsco 7420-1001 1 1/4 inch flexible impeller pump with neoprene impeller, full cam, mechanical...

    In Stock 

    Price: $590.30
  • Jabsco Engine Cooling Pumps

    Jabsco Engine Cooling Pumps

    Rugged, self-priming Jabsco Engine Cooling Pumps are ideal for cooling marine engines and can be...

    In Stock 

    Price: $609.09 to $746.97
  • Mercury Marine Upper Water Pump Repair Kits

    Mercury Marine Upper Water Pump Repair Kits

    Mercury Marine Upper Water Pump Repair Kits contain everything needed to repair upper water pumps...

    In Stock 

    Price: $134.76
  • Mercury Marine Replacement Water Pump Impellers

    Mercury Marine Replacement Water Pump Impellers

    Mercury Marine Replacement Water Pump Impellers fit a large variety of engine cooling systems....

    In Stock 

    Price: $18.91
  • Mercury Marine Water Pump Impeller Repair Kits

    Mercury Marine Water Pump Impeller Repair Kits

    Mercury Marine Water Pump Impeller Repair Kits are designed to be complete replacement kits for the...

    In Stock 

    Price: $33.29
  • Mercury Marine Engine Thermostat Kits

    Mercury Marine Engine Thermostat Kits

    Mercury Marine Engine Thermostat Kits contain all necessary parts to change the thermostat in your...

    In Stock 

    Price: $5.26 to $37.59
  • Mercruiser I / Alpha I Impeller and Water Pump Repair Kits

    Mercruiser I / Alpha I Impeller and Water Pump Repair Kits

    Sierra Impeller SIE-3017 and Water Pump Repair Kit SIE-3217 (with impeller) services water pumps...

    In Stock 

    Price: $15.27
  • Jabsco Impeller Pullers

    Jabsco Impeller Pullers

    Use these flexible impeller removal tools to pull impellers from marine water pumps and bilge...

    In Stock 

    Price: $108.42 to $111.22
  • Johnson / Evinrude OMC Thermostat with Gasket

    Johnson / Evinrude OMC Thermostat with Gasket

    Sierra 3672 replacement thermostat plus corresponding thermostat gasket for some Johnson, Evinrude,...

    In Stock 

    Price: $16.86
  • Johnson / Evinrude OMC Thermostat 18-3553

    Johnson / Evinrude OMC Thermostat 18-3553

    Sierra 3553 replacement thermostat for some Johnson, Evinrude, OMC and Mercury marine engine...

    In Stock 

    Price: $13.29
  • Johnson / Evinrude Water Pump Kits

    Johnson / Evinrude Water Pump Kits

    These two water pump kits service Johnson/ Evinrude marine outboard engines. Both kits are...

    In Stock 

    Price: $55.65 to $56.94
Items: 1 - 16 of 58 | Pages: 1  2  3  4  Next 
 

Cooling System Maintenance

Impellers, thermostats and water pumps are essential components to regulating an efficient working temperature in your marine engine. Engines passing seawater through the system will inevitably require service. Simple routine maintenance of cooling systems will assure your vessel is ready for its next adventure. Flush raw water systems on the trailer or at the end of the season. Failure of these components will overheat an engine, possibly leading to costly damage of core components.

Water pumps with rubber impellers burn out if run dry. This could be caused by simply forgetting to open a seacock. Another common cause at sea is weeds or a plastic bag stuck in the seawater intake through-hull. Having spares on hand is highly recommended. As impellers age they lose there flexibility and should be replaced.

The thermostat is a simple valve which opens once the engine has warmed, thus allowing the coolant to circulate. On most engines the thermostat will pop at 160 degrees F and be fully open at 180 degrees F. To troubleshoot, remove a suspect thermostat and place it in a pot of boiling water with a thermometer. A malfunctioning thermostat must be replaced.

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