SIERRA 18-7554 Knock Sensor

Compatible Engines

The SIERRA 18-7554 Knock Sensor is a critical component of the engine management system, designed to maintain peak performance and longevity. Identified by catalog number 18-7554 and EAN 808282340810, this sensor is dedicated to specific MERCRUISER MCM V-6 and V-8 engines (305, 350, 496 CID) equipped with MPI fuel injection. Its primary function is the precise detection of undesirable detonation, allowing the control unit to instantly adjust ignition timing. This prevents mechanical damage, such as piston or bearing fractures, ensuring smoother and more efficient engine operation.

Due to the specific construction of outboard and sterndrive engines, compatibility must always be verified by comparing the manufacturer's catalog number (18-7554) or the original OE number with your propulsion unit's documentation. If you have any doubts regarding part fitment, contact our store support – we are happy to assist in selecting the correct component to ensure your purchase fits perfectly.

Installation and Operation

• Precise Detection: The SIERRA sensor reacts to the slightest deviations in the combustion process, protecting the engine from detonation damage.
• Genuine Quality: SIERRA brand products ensure compliance with engine manufacturer standards, guaranteeing durability in harsh marine conditions.
• Easy Installation: This part is a direct replacement, simplifying the replacement process and reducing vessel downtime.
• Optimized Performance: A high-quality sensor maintains optimal ignition timing, leading to better performance and reduced fuel consumption.

Remember that regular replacement of faulty sensors is an investment in water safety. Do not delay repairs if you notice a drop in power or uneven engine operation.