Nissan Xterra Camshaft Seal keeps oil in and keeps dirt out where the camshaft leaves the cylinder head. The camshaft opens and closes the intake and exhaust valves for combustion in your Nissan Xterra engine. The main Camshaft Seal helps ensure clean lubrication around the rotating cam journals. In the Nissan Xterra setups, the seal is there for lubrication pressure and external leak prevention. The crankshaft drives the camshaft by a timing chain or belt. This timing chain or belt turns at half crankshaft speed. Thus, both shafts are precisely timed or synchronized. As a result, valve events remain synchronized with piston movement. The Camshaft Seal keeps an oil film during this rotation. The Camshaft Seal performs the same function whether the engine employs a single overhead cam, double overhead cam, or a block mounted cam with lifters, pushrods, and rocker arms. That function is to provide a tight seal to stop leaks or contamination. The Nissan Xterra powertrain is consistent, thanks to this easy-to-install Camshaft Seal.
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