Signs of a Timing Chain Tensioner That is Beginning to Go Bad

Timing chain tensioners are devices designed to maintain the appropriate amount of tension on chains that synchronize and rotate the crankshaft and camshaft of an automotive engine. They do so using an internal spring and hydraulic pressure from engine oil; sometimes cryogenically treated tensioners may even increase strength and durability internally.

Timing chain tensioners are essential parts that must remain in good working condition to keep valves and pistons synchronized and protect them from direct contact during operation. Knowing the signs that indicate when one has begun to fail is vitally important so owners and mechanics can make necessary repairs before costly valve-piston contact damage occurs.

Initial indicators that your tensioner has begun to fail include any noticeable rattling sounds during startup or acceleration, particularly at startup or acceleration. Rattling noises often indicate when pressure has not been maintained evenly on chains by tensioners; this is often an early telltale sign that tensioners need replacing soon.

Other symptoms may include poor gas mileage or a noticeable loss of power. A loose chain can cause its timing to jump a few teeth, which will result in power being sapped from your engine. Under extreme conditions, it could even snap altogether resulting in catastrophic engine damage due to valve-to-piston contact.

An indication that your tensioner has failed is when its hydraulic pressure is no longer enough to maintain proper tension on your chain, often producing an audible "knocking sound" as it pulls away from its camshaft.

Failure of a timing chain tensioner can result in numerous other issues, including broken camshaft or crankshaft components. As soon as it shows signs of wear, replacement should take place immediately.

Newer cars utilize engine oil to regulate chain tension. Therefore, fresh and high-quality oil that meets manufacturer-recommended viscosity must be used as it will help ensure proper tensioner functionality. Old or low-quality oil may damage seals and passages in the tensioner prematurely leading to early failure and costly engine repairs in turn causing even further issues in its wake if left unchecked; regular inspection of tensioner, chain, and guides will ensure optimal timing system operation.