Subaru Timing Camshaft Sprocket - Right Intake (13320AA001)
Updated June 10, 2026
This is the right-side intake camshaft sprocket (also called timing gear) used in Subaru 2.5L H4 turbo engines (EJ255/EJ257). It is driven by the timing belt and controls the opening and closing of intake valves. OEM part number 13320AA001.
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How It Works
The sprocket mounts onto the intake camshaft and meshes with the timing belt. It rotates the camshaft in precise synchronization with the crankshaft to control valve timing. Some versions incorporate Subaru's AVCS (variable valve timing) mechanism for optimized performance across the RPM range.
Common Failure Symptoms
Worn or damaged sprocket teeth can cause timing belt noise (chirping or rattling), rough idle, reduced power, or a check engine light. If timing slips, the engine may misfire, run poorly, or suffer internal damage due to valve contact.
Installation Notes
Always align the timing marks on the sprocket with the belt and other cam/crank components during installation. Replace the sprocket during timing belt service. Use new mounting bolts and tighten to the manufacturer's specification. Verify compatibility with your engine code and VIN before purchase.
