DIABOLO 19291A3

Function and technical context

The diabolo is a precision component located in the cooling and lubrication system of Mercury, Mariner and MerCruiser engines. It acts as a distribution and regulation element of critical flows in the internal circulation of the engine, ensuring that the coolant and oils are directed towards the areas that require cooling and thermal protection. Its correct operation is essential to maintain the operating temperature within safe ranges; Any deterioration in this part can cause localized overheating, poor coolant circulation and, consequently, progressive damage to cylinders, gaskets and liners.

When to replace this part?

It is recommended that the diabolo be inspected during seasonal maintenance and replaced if signs of wear, obstruction, corrosion or cracks affecting its internal geometry are detected. Although there is no strictly fixed replacement interval, preventive inspection is especially important in engines that have been exposed to salt water or long periods of inactivity, where sedimentation and corrosion progress more quickly. Changing this part preventively during a maintenance check avoids unexpected navigation problems and significantly prolongs the useful life of the engine.

Engine Compatibility

Compatible Mercury Mariner Engines

Equivalent manufacturer part numbers