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Thermostats & Cooling Components - Marine Engine Parts

Premium Marine Engine Thermostats & Cooling Components

Explore our comprehensive selection of marine engine thermostats, cooling system components, and heat exchangers designed for reliable temperature regulation in harsh marine environments. Our cooling system parts ensure optimal engine performance and prevent overheating in both commercial and recreational vessels.

Product Categories

  • Thermostats: Precision temperature control devices for marine engines
  • Thermostat Housings: Durable housings and mounting components
  • Heat Exchangers: Efficient cooling system heat transfer units
  • Coolant Components: Hoses, fittings, and coolant system accessories
  • Cooling System Parts: Complete range of engine cooling components

All components are engineered to withstand saltwater corrosion, high temperatures, and the demanding conditions of marine propulsion systems. Whether you're performing routine maintenance, troubleshooting overheating issues, or upgrading your cooling system, our thermostats and cooling components deliver the reliability and performance your marine engine requires.

Essential parts for maintaining proper engine operating temperatures and preventing costly damage from overheating.

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Mercury MerCruiser Quicksilver Thermostat Gasket 62386001

$3.84 - $3.84
$3.84
$3.84 - $3.84
$3.84
Only 2 left!

Mercury MerCruiser Quicksilver 27-62386001 is a thermostat gasket used to seal the thermostat housing area on select Mercury / Mariner outboard and...

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$3.84 - $3.84
$3.84
$3.84 - $3.84
$3.84

Mercury MerCruiser Quicksilver Thermostat Housing Gasket 806871

$13.98 - $13.98
$13.98
$13.98 - $13.98
$13.98
Only 4 left!

Mercury MerCruiser Quicksilver 27-806871 is a thermostat housing gasket used on select MerCruiser gasoline engines. It seals the thermostat housing...

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$13.98 - $13.98
$13.98
$13.98 - $13.98
$13.98

Mercury Thermostat Cover Gasket 14318005

$5.15 - $5.15
$5.15
$5.15
$5.15 - $5.15
$5.15
Only 3 left!

Mercury 14318005 is a genuine OEM thermostat cover gasket for select Mercury and Mariner 2-stroke outboards. Current Mercury dealer references iden...

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$5.15 - $5.15
$5.15
$5.15
$5.15 - $5.15
$5.15

Mercury MerCruiser Thermostat Retainer 861949T

$67.49 - $67.49
$67.49
$67.49
$67.49 - $67.49
$67.49
Only 1 left!

Mercury MerCruiser Quicksilver 861949T is a genuine OEM thermostat retainer used in MerCruiser big-block cooling-system assemblies. Current Mercury...

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$67.49 - $67.49
$67.49
$67.49
$67.49 - $67.49
$67.49

Volvo Penta Thermostat Housing Cover O-Ring 3858938

$8.10 - $8.10
$8.10
$8.10 - $8.10
$8.10
Only 2 left!

Volvo Penta 3858938 is a genuine OEM O-ring used in select Volvo Penta sealing applications. Current active parts listings consistently identify it...

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$8.10 - $8.10
$8.10
$8.10 - $8.10
$8.10

Volvo Penta Thermostat Cooling O-Ring 3586514

$26.10 - $26.10
$26.10
$26.10 - $26.10
$26.10
Only 2 left!

Volvo Penta 3586514 is a genuine OEM O-ring used in select Volvo Penta cooling-system service applications. Current dealer and distributor referenc...

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$26.10 - $26.10
$26.10
$26.10 - $26.10
$26.10

Volvo Penta Thermostat Cooling O-Ring 3583830

$15.10 - $15.10
$15.10
$15.10 - $15.10
$15.10
Only 2 left!

Volvo Penta 3583830 is a genuine OEM O-ring used in Volvo Penta cooling-system service. Current fitment trails support this seal in compact Volvo P...

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$15.10 - $15.10
$15.10
$15.10 - $15.10
$15.10

PCM Pump-to-Thermostat Housing Elbow – R024002

$93.56 - $93.56
$93.56
$93.56 - $93.56
$93.56
Only 1 left!

he PCM R024002 is a genuine OEM pump-to-thermostat housing elbow used in Pleasurecraft Marine (PCM) fresh water cooling (FWC) systems. This compone...

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$93.56 - $93.56
$93.56
$93.56 - $93.56
$93.56

Volvo Penta Thermostat Housing Gasket – 1542123

$33.00 - $33.00
$33.00
$33.00
$33.00 - $33.00
$33.00
Only 1 left!

Product Title Volvo Penta Gasket 1542123 – OEM Marine Engine Thermostat Housing Gasket Product Description The Volvo Penta 1542123 Gasket i...

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$33.00 - $33.00
$33.00
$33.00
$33.00 - $33.00
$33.00

PCM Thermostat 170°F Closed Cooling – R026007

$84.68 - $84.68
$84.68
$84.68 - $84.68
$84.68
Only 1 left!

The PCM R026007 Thermostat is a genuine OEM 170°F thermostat designed specifically for fresh water cooled (closed cooling) PCM and Crusader marine ...

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$84.68 - $84.68
$84.68
$84.68 - $84.68
$84.68

PCM Thermostat Kit 143°F – RP026002E

$78.62 - $78.62
$78.62
$78.62 - $78.62
$78.62
Only 1 left!

The PCM RP026002E Thermostat Kit is a genuine OEM 143°F raw water thermostat designed for Pleasurecraft Marine (PCM) Ford-based inboard engines. Th...

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$78.62 - $78.62
$78.62
$78.62 - $78.62
$78.62

PCM Thermostat Housing Gasket RM0004

$3.67 - $3.67
$3.67
$3.67
$3.67 - $3.67
$3.67
Only 1 left!

Prevent coolant leaks and maintain proper engine cooling with the PCM Thermostat Housing Gasket RM0004. This genuine Pleasurecraft Marine (PCM) OEM...

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$3.67 - $3.67
$3.67
$3.67
$3.67 - $3.67
$3.67

MerCruiser Thermostat Cover Housing – 8M0061068 (454 / 502 Big Block)

$162.84 - $162.84
$162.84
$162.84 - $162.84
$162.84
Only 1 left!

The Mercury / Quicksilver 8M0061068 Thermostat Cover Housing is a genuine OEM upper thermostat housing cover used on MerCruiser GM-based marine eng...

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$162.84 - $162.84
$162.84
$162.84 - $162.84
$162.84

Yanmar Marine Engine Thermostat - OEM Cooling System Component

$128.70 - $128.70
$128.70
$128.70
$128.70 - $128.70
$128.70
Only 1 left!

OEM Thermostat for Yanmar Marine Engines This genuine Yanmar thermostat is designed for marine engines, regulating coolant temperature to maintain ...

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$128.70 - $128.70
$128.70
$128.70
$128.70 - $128.70
$128.70

Yanmar Thermostat Gasket 129150-49811 - Marine Diesel Engine

$3.59 - $3.59
$3.59
$3.59
$3.59 - $3.59
$3.59
Only 2 left!

Genuine Yanmar Thermostat Gasket - Professional Marine Engine Component OEM thermostat gasket designed for Yanmar marine diesel engines. Precision-...

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$3.59 - $3.59
$3.59
$3.59
$3.59 - $3.59
$3.59

Yanmar Thermostat Gasket 119773-49570 - Marine Diesel Engine

$6.98 - $6.98
$6.98
$6.98
$6.98 - $6.98
$6.98
Only 3 left!

Genuine Yanmar Thermostat Gasket - Professional Marine Engine Component OEM thermostat gasket designed for Yanmar marine diesel engines. Precision...

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$6.98 - $6.98
$6.98
$6.98
$6.98 - $6.98
$6.98

Yanmar Thermostat 119773-49550 - 70°C Marine Diesel Engine

$157.22 - $157.22
$157.22
$157.22
$157.22 - $157.22
$157.22
Only 4 left!

Genuine Yanmar 70°C Thermostat - Professional Marine Diesel Engine Component OEM thermostat designed for Yanmar marine diesel engines with a 70°C ...

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$157.22 - $157.22
$157.22
$157.22
$157.22 - $157.22
$157.22

Yamaha Thermostat 6H3-12411-20-00 - Special Order

$0.00 - $0.00
$0.00
$96.89
$96.89 - $96.89
$96.89

The Yamaha 6H3-12411-20-00 is an OEM thermostat for select Yamaha two-stroke outboard cooling systems. It regulates engine operating temperature by...

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$0.00 - $0.00
$0.00
$96.89
$96.89 - $96.89
$96.89

Yamaha Outboard Thermostat – 6AW-12411-00-00

$89.47 - $89.47
$89.47
$89.47 - $89.47
$89.47
Only 2 left!

The Yamaha 6AW-12411-00-00 Thermostat is a genuine OEM cooling system component designed to regulate engine temperature in Yamaha outboard motors. ...

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$89.47 - $89.47
$89.47
$89.47 - $89.47
$89.47

Yamaha Thermostat Seal | 67F-12412-00-00

$14.70 - $14.70
$14.70
$14.70
$14.70 - $14.70
$14.70
Only 2 left!

Genuine Yamaha OEM thermostat seal designed to provide a reliable, leak-free seal in your marine engine's cooling system. This precision-engineered...

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$14.70 - $14.70
$14.70
$14.70
$14.70 - $14.70
$14.70

Yamaha Outboard Thermostat – 67F-12411-01-00

$73.54 - $73.54
$73.54
$73.54 - $73.54
$73.54
Only 2 left!

The Yamaha 67F-12411-01-00 Thermostat is a genuine OEM cooling system component designed to regulate engine temperature in Yamaha outboard motors. ...

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$73.54 - $73.54
$73.54
$73.54 - $73.54
$73.54

Sierra Marine Thermostat 18-43017 – Indmar S985009 / MerCruiser 8.1L 496 MAG Cooling System

$46.93 - $46.93
$46.93
$46.93
$46.93 - $46.93
$46.93
Only 1 left!

The Sierra 18-43017 Thermostat is a precision 160° temperature control thermostat designed for high-horsepower GM-based marine engines, including I...

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$46.93 - $46.93
$46.93
$46.93
$46.93 - $46.93
$46.93

Sierra 18-3552 Thermostat – Mercury MerCruiser Replacement

$39.51 - $39.51
$39.51
$39.51
$39.51 - $39.51
$39.51
Only 1 left!

The Sierra 18-3552 Thermostat is a high-quality aftermarket replacement designed for Mercury MerCruiser engines, providing reliable temperature reg...

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$39.51 - $39.51
$39.51
$39.51
$39.51 - $39.51
$39.51

Sierra 18-3549 Thermostat 120°F – Johnson Evinrude OMC Replacement

$43.75 - $43.75
$43.75
$43.75
$43.75 - $43.75
$43.75
Only 1 left!

The Sierra 18-3549 Thermostat (120°F) is a premium aftermarket replacement designed for Johnson, Evinrude, and OMC outboard engines. It regulates e...

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$43.75 - $43.75
$43.75
$43.75
$43.75 - $43.75
$43.75