13142AA017 Subaru TENSIONER-CHAIN, Price: 38.95$, Weight: 0.191kg

Engine Timing Chain Tensioner for Subaru

This component keeps the engine’s timing chain held at the correct tension, so the crankshaft and camshaft stay perfectly synchronized. It’s a small part with a big job: stable valve timing, smooth idle, clean acceleration, and long engine life ✅.

Why This Part Is Needed

As the chain and guides wear, slack can develop. The tensioner constantly takes up that slack to prevent chain whip and timing drift. Without proper tension, even a healthy engine can start to run rough ⚙️.

How It Works

Inside is a spring and oil-pressure assisted piston that pushes on the chain guide. When rpm and oil pressure rise, it firms up the load, keeping the chain steady under all conditions. A one-way ratchet/locking action helps it hold position after shutdown ?.

What Happens If It’s Worn or Broken

Common signs include rattling on cold start, ticking near the timing cover, misfires, poor power, and check engine light. If it fails badly, the chain can jump teeth, causing severe valve-to-piston contact and major engine damage ?.