Scion 13050-0T010 Gear Assy, Camshaft Timing

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The intake camshaft sprocket actuator assembly has an inner hub attached to the camshaft, consisting of fixed vanes. Oil pressure acts as a wedge against these vanes, causing the camshaft to rotate. Higher oil pressure results in more rotation, advancing or retarding the camshaft.

1. Visually inspect all parts for wear and damage. 2. Check the timing chain for loose pins, cracks, worn rollers, and side plates. 3. Check the sprockets for hook-shaped, chipped, and broken teeth. 4. Check the timing chain for stretching and the diameter of the timing sprockets for wear with the chain assembled on the sprockets. 5. Measure the chain stretch at three or more places around the chain. If chain stretch exceeds the specifications between any 8 links, the chain must be replaced. 6. Check the chain guides for excessive wear and replace them if necessary. 7. Inspect the chain guide oil hole on the front of the oil pump for clogging if excessive wear is indicated.