859869 Thermo Monitor | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta thermo monitor from the Instruments group, weighing 0.041 kg and listed for 9 applications across the TMD, MS, TAMD and MD engine series. It shares its nine-application fitment list with the oil pressure sensor 860011 in this listing group, which monitors the other side of the same warning circuit.

🚤 Compatibility

Typically suits:

• Volvo Penta TMD22A
• Volvo Penta TMD22B
• Volvo Penta TMD22P-C
• Volvo Penta MS2B-A
• Volvo Penta TAMD22P-B
• Volvo Penta MD22
• Volvo Penta MD22A
• Volvo Penta MD22L
• Volvo Penta MD22P

• Engine Family: TMD, MS, TAMD, MD

⚙️ Key Features

• 0.041 kg
• 9 applications across TMD, MS, TAMD and MD engines
• Instruments group
• Shares its fitment list with oil pressure sensor 860011

🔌 Function

Senses coolant temperature and signals the instrument or alarm circuit when it rises past the set point, giving warning before damage is done.

⚠️ Common Signs of Failure

• Overheat alarm sounding with a normal gauge reading, or staying silent when the engine is plainly hot
• Alarm that triggers intermittently, often with vibration or engine movement
• Corroded or weeping threads where the unit screws into the casting
• Terminal corroded, or the connection loose in its spade
• Alarm that never sounds at all, including at the ignition-on self check

🛠️ Service Notes

• Test the alarm circuit at every service — a monitor that has failed silently gives no warning at all until the damage is done
• Check the sender's earth path and its terminal before condemning the unit, as a poor earth gives the same symptoms
• Renew the sealing washer and take care with the thread in an alloy casting

📦 Condition

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