SPACER 23-891919001

Function and technical context

The thrust spacer is a precision component integrated into the marine propulsion system of Mercury, Mariner and MerCruiser engines. This part acts as a positioning and load distribution element in the transmission of thrust from the engine to the propeller, guaranteeing the correct alignment of the drive components. Its correct operation is essential to maintain the efficiency of the transmission and avoid abnormal vibrations that compromise the stability of the propulsion system and the structural integrity of adjacent components.

When to replace this part?

Although the spacer is a slow-wearing component, it should be inspected during every seasonal maintenance check, especially if you experience unusual transmission vibrations, impact noises in the propulsion system, or noticeable misalignment in the propeller. If the spacer shows signs of warping, erosion or excessive play, preventative replacement is advisable to avoid cascading damage to other drivetrain components, which can result in significantly more expensive repairs. A professional inspection at the annual dock is the best guarantee of optimal functioning of the system.

Compatible Mercury Mariner Engines

Equivalent manufacturer part numbers