Description

The Westerbeke Thermostat 822-0377 is a genuine OEM 77°C (170°F) thermostat designed for Westerbeke marine diesel and gasoline engines as well as generator sets. This thermostat regulates coolant flow to maintain proper engine operating temperature, ensuring efficient combustion, reduced internal wear, and stable performance under load.

Calibrated to open at 77°C (170°F), this thermostat is commonly used in closed-loop (freshwater cooled) Westerbeke systems, allowing engines to run at optimal temperature for fuel efficiency and longevity.

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Key Features

• Genuine Westerbeke OEM thermostat
• 77°C / 170°F temperature rating
• Maintains consistent engine operating temperature
• Designed for marine diesel and generator applications
• Corrosion-resistant construction for marine environments
• Direct OEM replacement

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Engine Compatibility

Used across a wide range of Westerbeke engines and generators, including:

• Westerbeke marine diesel engines
• Westerbeke gasoline generator sets
• Universal (by Westerbeke) marine engines

Common applications include:

• 20B, 30B, 5.0 BCD series (and similar platforms)
• Various BTG / BTD / BEG generator models

Typically used in freshwater/closed cooling systems
May include bypass-style thermostat depending on engine model

Westerbeke thermostats are used across multiple engine families, so exact fitment must be verified by engine model or serial number.

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Serial Number Fitment Notice

Westerbeke uses multiple thermostat variations across similar engine models. Always confirm compatibility using your engine model and serial number before ordering.

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When This Part Needs Replacement

• Engine overheating or running hotter than normal
• Engine not reaching proper operating temperature
• Fluctuating temperature readings
• Thermostat sticking or corrosion
• Routine cooling system service

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Installation Notes

• Replace thermostat gasket or O-ring during installation
• Install with spring side toward engine
• Ensure proper seating in housing
• Inspect coolant system for scale or blockage
• Verify operation after installation

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Alternate / Superseded / Cross-Reference Part Numbers

• Westerbeke: 822-0377
• Equivalent / Related: 037043
• Sierra: 23-3602 (application dependent)
• Other Westerbeke refs may vary by engine model

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Parts Desk Insight

Westerbeke thermostats are not one-size-fits-all even when temperature ratings match. The 77°C version is commonly used across mid-range diesel and generator units, but housing depth and bypass configuration can vary. Always match the physical design if you don’t have the original part number.

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Shipping

Shipping: Ships same or next day for fast Canada wide shipping.