OMC Evinrude Johnson Cam, Actuator

An OMC Evinrude Johnson cam actuator is a mechanical component that controls the timing of valve operation in an outboard engine. It works by rotating a cam that then pushes on Valve lifters, opening and closing valves at specific times during the engine cycle. Essentially, it's a critical part that determines when the engine breathes in and out. 

More Detail:

Function:

The cam actuator, also known as a shift actuator cam or a fuel pump cam, is responsible for initiating the movement of the valves in an engine. 

Mechanism:

It typically involves a rotating cam attached to a shaft. As the cam rotates, it pushes on valve lifters or other mechanisms that are connected to the valves

Importance:

Proper timing of valve operation is essential for optimal engine performance, fuel economy, and emissions control. A malfunctioning cam actuator can lead to misfires, poor fuel economy, or engine damage.

Variations:

There are different types of cam actuators, including those for fuel pumps and shift systems in some OMC engines.

Use in OMC Engines:

OMC Evinrude and Johnson outboards, especially those in the 18-35HP range from the 1990s to 2005, commonly use these cam actuators.