ARCO MerCruiser Replacement Ignition Sensor

The ARCO replacement ignition sensor is intended for compatible MerCruiser ignition systems using the sensor families listed by the manufacturer. It provides the ignition-trigger input required by the corresponding distributor and ignition-control arrangement. The supplier description is centered on MerCruiser applications, so the original sensor number should be used to confirm the correct installation. This is a direct service component rather than a universal magnetic pickup for unrelated distributors.

The cross-reference list includes MerCruiser 87-892150Q02, 892150A02, 861780A2, 91019A6, 861780Q4, 861780A4, 91019A3, and 91019A2. Sierra 18-5116-1 is also identified as an interchange reference. The number of superseded Mercury references makes part-number comparison particularly helpful on older engines. Check the distributor and connector arrangement against the removed sensor before final assembly.

Inspect the distributor wiring, sensor connector, cap, rotor, and grounds while access is available. A damaged harness or corroded terminal can produce an intermittent ignition signal even when the sensor itself is serviceable. ARCO lists 12-month parts-and-labor warranty protection for this replacement part. After installation, verify reliable starting and stable ignition operation through the normal engine-speed range.

• Cross-references multiple superseded MerCruiser sensor numbers
• Also cross-references Sierra 18-5116-1
• Direct replacement for the specified distributor ignition-sensor system
• Useful for restoring a consistent ignition-trigger signal

For additional MerCruiser ignition sensors and distributor-service components, Browse more Engine Controls & Ignition for related replacement and service components.