SIERRA 118-7558 Knock Sensor

Compatibility

Professional maintenance of your propulsion unit requires the use of original or high-quality replacement parts. This listing features the SIERRA 118-7558 Knock Sensor, a critical component of the electronic system that monitors the combustion process and protects the engine from mechanical damage caused by abnormal combustion. This part is dedicated to outboard motors, ensuring high quality and compliance with OEM standards.

Since the specifics of boat engines vary greatly and compatibility may depend on the model year and engine version, we recommend verifying fitment by comparing the manufacturer's catalog number 118-7558 with the OE number in your equipment's manual. If you have any doubts about whether the SIERRA 118-7558 sensor will fit your engine perfectly, contact our customer support. Our experts are happy to help you select the right part and ensure safe operation.

Installation and Operation

Replacing a knock sensor is an operation that requires precision. We recommend disassembly with a cold engine to avoid burns and damage to components around the cylinder head. Before installing the new SIERRA 118-7558 sensor, ensure the socket is clean and free of contaminants that could interfere with readings. Tightening the sensor accurately according to the torque recommended by the engine manufacturer is key to proper system operation. Regular inspection of this element allows for early detection of ignition or fuel quality issues, leading to repair cost savings and extended engine life.

• Original replacement quality – guarantees durability and precise combustion parameter readings.
• Accurate fit – number 118-7558 corresponds to OEM part specifications for selected models.
• Engine protection – effective knock detection prevents serious piston and ring damage.
• Easy installation – standard mounting facilitates replacement during servicing.