The Mercury Temp Sensor is an essential component designed to monitor engine temperature in Mercury outboard motors. Maintaining the correct engine temperature is crucial for optimal performance, fuel efficiency, and longevity.
 
This sensor plays a pivotal role by providing real-time temperature readings to temp gauge on legacy 2-stroke carb motors and to the Electronic Control Module (ECM) on later outboards, ensuring the motor operates within safe parameters.
 
Temperature regulation is critical because an overheating engine can lead to severe damage, including warped cylinder heads, blown gaskets, and even complete engine failure.
 
The Mercury Temp Sensor helps prevent such issues by alerting the ECM when temperatures rise beyond the recommended range. This can trigger a warning alarm or activate the engine’s protection mode, reducing power output to prevent further damage.
 
If the temperature exceeds the safe limit, the sensor signals the ECM to adjust fuel delivery, ignition timing, and cooling system operation. In extreme cases, it can trigger an engine protection mode, reducing RPM and power output to prevent catastrophic failure. This not only protects the engine but also ensures a longer service life and fewer costly repairs.
 
Regular maintenance of the temperature sensor is vital. A faulty sensor can lead to inaccurate temperature readings, causing the engine to run too hot or too cold. This can result in poor performance, increased fuel consumption, and potential damage to internal components. Therefore, it’s important to replace the sensor if it shows signs of wear or malfunction.
 
The original part number for the Mercury Temp Sensor is 3536, a widely recognized and commonly used component across various Mercury outboard models.
 
However, several cross-reference part numbers are compatible with this sensor, providing flexibility when sourcing a replacement.
 
These include:
8M6000636 – Genuine Mercury Marine replacement part.
18-5896 – Sierra high-quality aftermarket alternative.
133536A13 – An alternative OEM-compatible part.
1365-3536A13 – Another cross-reference used by some suppliers.
84-3536A13 – Often found in older stock or aftermarket listings.
 
These cross-reference numbers ensure that users can find a suitable replacement even if the original part number is unavailable. When purchasing a replacement, it’s important to verify compatibility with your specific engine model to avoid fitment issues.
 
The Mercury Temp Sensor with part number 3536A13 fits a wide range of Mercury outboard motors, particularly those with 2-stroke engines. These include models with engine displacements of 2.0 liters, 2.4 liters, 2.5 liters, and 3.0 liters, covering various horsepower ratings from 135HP to 300HP.
 
Specifically, the compatible outboard models include:
 
2.0-Liter Engines: 135HP, 150HP
2.4-Liter Engines: 150HP, 175HP, 200HP
2.5-Liter Engines: 150HP, 175HP, 200HP, 225HP, and 225 Pro Max
3.0-Liter Engines: 225HP, 250HP, and 300HP
 
These sensors are commonly found in Mercury EFI, Pro Max, 260 ROS, and high-performance models, making them essential for both recreational boaters and professional anglers. Ensuring the correct sensor for your engine guarantees accurate temperature readings and reliable engine performance.
 
Installing a new Mercury Temp Sensor is a relatively simple task that can be performed with basic tools. The sensor is typically located on the cylinder head or near the thermostat housing. To replace the sensor, follow these steps:
 
Locate the Sensor: Identify the sensor on the engine block behind the 5/16 bolt and fork.
Disconnect the Wiring and Remove the Old Sensor: Carefully unplug the electrical connector from the sensor. Keep note if there are mulitple leads in addition to the black ground wire.
Install the New Sensor and Reconnect the Wiring: Plug the connector back into block ground the black ring termical to the block. If you had multiple Tan / Blue Stripe leads, be sure to connect all of them into the sensor with a clean and insuktaed connector.
Test the System: Start the engine and monitor the temperature readings to ensure the new sensor is functioning properly.
 
Regular inspection and maintenance are key to ensuring the longevity of the sensor. Look for signs of corrosion, physical damage, or inaccurate temperature readings.
 
If the engine frequently triggers temperature alarms without obvious signs of overheating, the sensor might be faulty and require replacement.
 
Why Choose Genuine OEM Sensor?
 
When replacing a Mercury Temp Sensor, it’s crucial to choose either an OEM part or a high-quality aftermarket alternative. Genuine Mercury sensors, such as part number 3536A13, are designed to meet the manufacturer’s specifications, ensuring accurate readings and reliable performance.
 
Includes one (1) Mercury OEM Temp Sensor  13536-A13
 
For technical support contact: Mike Hill at mike@buckshotracing77.com or call +1-714-697-1716