CHAMPION RN7YC SPARK PLUG

Function and technical context

The Champion RN7YC spark plug is part of the engine's ignition system, being responsible for generating the electric spark that ignites the fuel and air mixture in each cylinder at the precise moment of the combustion cycle. Its correct operation is decisive to achieve complete and efficient ignition, which directly translates into power output, fuel economy and low emissions. In Volvo Penta marine engines of the AQ, BB, 230, 250 and B series, electrode degradation or incorrect gap cause misfires that generate vibrations, loss of performance and even damage to the catalyst or the engine itself. The Volvo Penta reference associated with this spark plug is 875820, guaranteeing compatibility with the factory ignition specifications for these series.

When to replace this part?

The most common symptoms that indicate that the spark plug needs to be replaced are: difficult starting or misfiring when cold, jerking and loss of power at cruising speed, increased fuel consumption and presence of soot or deposits on the electrode visible during the inspection. For marine engines in regular use, it is recommended to replace the spark plugs every nautical season or every 100 hours of operation, which is more frequent than in land applications due to the humidity and sustained load conditions typical of marine use. Changing the spark plugs preventively during early-season maintenance is a simple and economical practice that avoids being left without propulsion at sea.

Compatible Volvo Engines

Equivalent manufacturer part numbers