COIL 663-85540-11/15

Function and technical context

The ignition coil is the component responsible for generating and distributing the high-tension spark necessary for the ignition of the air-fuel mixture in the engine cylinders. This element works integrated into the boat's ignition system, coordinating its operation with the magneto or the electronic ignition system to guarantee efficient combustion in each engine cycle. Its correct operation is critical: a defective coil causes misfires, loss of power, difficulties in starting and abnormal fuel consumption that compromises the seaworthiness and efficiency of the boat.

When to replace this part?

Typical symptoms of a faulty ignition coil include intermittent misfires when accelerating, difficulty starting when cold, loss of revs under load, and unpredictable engine cut-outs while cruising. It is recommended to check and, if necessary, replace the coil during each seasonal maintenance or in the event of any irregularity in the ignition behavior. Preventive replacement of this component prevents unexpected breakdowns at sea and ensures reliable and safe operation of your boat throughout the sailing season.

Compatible engines

Compatible Mercury Mariner Engines

Equivalent manufacturer part numbers