The Camshaft of your Subaru Outback is timed to the crankshaft so that the opening and closing of the intake and exhaust valves happen in tandem. This allows the boxer cylinders to breathe and make power as efficiently as possible. Bearings support hardened steel or cast iron journals which are positioned with respect to a cam rotating continuously about a fixed axis. The eccentricity of the lobes provides the push on the follower, lifter, or bucket which translates rotation into the precise lift that allows fresh air fuel charge to enter and burnt gases to exit. The earlier Outbacks employed overhead valve configurations, which featured a single cam mounted to the block that operated the lifters, pushrods, and rocker arms. Later generations switched to single overhead cam heads. Performance-oriented trims progressed through double overhead cam designs, which separate the intake and exhaust lobes, reducing valvetrain weight and sharpening response. For Subaru enthusiasts, the appropriate replacement Outback Camshaft choice keeps the boxer dialed in. Regardless of design, either a belt or chain connects the cam with the crank at half speed, and correct Camshaft timing is important because misalignment can rob or cause misfires. Routine oil changes will protect the lobes and keep the Camshaft spinning. Lubrication is essential; a worn Camshaft can lead to a Subaru Outback heading to the garage.
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