873877 Thermo Monitor | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta thermo monitor rated at 97 degrees Celsius, for use with 873743, from the Instruments group. It weighs 0.073 kg, is listed for 14 applications across the TAMD, TMD and AD series, and supersedes part number 873725. The 97 degree switching point is the detail that decides the order.

🚤 Compatibility

Typically suits:

• Volvo Penta TAMD42WJ-A
• Volvo Penta TMD31L-A
• Volvo Penta TMD41L-A
• Volvo Penta AD31L-A
• Volvo Penta AD31P-A
• Volvo Penta TAMD41H-A
• Volvo Penta TAMD41H-B
• Volvo Penta TAMD41P-A
• Volvo Penta TAMD41P
• Volvo Penta TAMD31L-A
• Volvo Penta TAMD31M-A
• Volvo Penta TAMD31P
• Volvo Penta TAMD31P-A
• Volvo Penta TAMD31S

• Engine Family: TAMD, TMD, AD

⚙️ Key Features

• Switches at 97 degrees Celsius
• For use with 873743
• 0.073 kg
• 14 applications across TAMD, TMD and AD engines
• Supersedes 873725

🔌 Function

Closes at 97 degrees Celsius to raise the overheat alarm before coolant temperature reaches a damaging level.

⚠️ Common Signs of Failure

• Overheat alarm sounding with the temperature gauge reading normal
• No alarm at all when the engine is genuinely running hot
• Alarm cutting in and out as the boat pitches or vibrates
• Corrosion or weeping coolant around the sensor body and threads
• Warning circuit reading permanently closed at the panel

🛠️ Service Notes

• Treat this as a safety device — if the alarm has ever failed to sound during a genuine overheat, replace rather than test and refit
• Check the coolant level, thermostat and heat exchanger before assuming the monitor is at fault
• Seal the thread on assembly and check for weeping once the engine is up to temperature

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 873877 → Supersedes 873725

OEM / Related Numbers

• 873725 earlier number superseded by this part

📦 Condition

• Genuine Volvo Penta part
• Brand new
• Supplied in original or equivalent packaging