Tips for identifying timing belt, tensioner and idler failure – UnderhoodService

Tips for identifying timing belt, tensioner and idler failure

Courtesy of SKF

When identifying timing belt, tensioner and idler failure, the first sign of wear is noise. For example, if the tensioner sounds bad, it’s usually bad.

Start by listening to hear if any noise is coming from the timing cover or front assembly while the engine is running. Bad bearings make a high pitched “whine” or “growling” noise after the engine has been started. If there is noise, and it is identified as coming from behind the timing cover, follow these steps:

• Remove the timing belt cover(s) and inspect the timing belt.

• Misalignment of the timing belt can cause premature failure of the idler pulley on the tensioner as well as the belt. Generally, this indicates that the tensioner or idler is not correctly attached to the mounting location on the engine, or the bearings for the tensioner, idler or both have worn out and have excess play. Correcting belt and bearing alignment is critical.

• With the timing belt removed, check the idler pulley(s) for failure.

• Check for side-to-side play or rocking on both the idler pulley and tensioner pulley. Replace if any movement is detected.

• Check both the idler and tensioner pulleys for roughness when rotating the bearing. The idler and tensioner should spin freely and smoothly. Replace the bearing(s) if roughness is determined.

• Do not re-use the timing belt, tensioner or idler if misalignment is found. Replace with new components to avoid engine damage or failure.

SKF recommends replacing timing belts, tensioner and idlers at 60,000 to 80,000 miles to prevent unnecessary engine damage.

Courtesy of SKF. For more information about SKF, contact your local SKF representative, visit www.vsm.skf.com, or call 800-882-0008.

You May Also Like

Acura Turbo Engine Service

It is important to check the operation of the solenoids that control vacuum to the actuators.

The 2007-2012 Acura RDX was Honda’s first production vehicle in North America with a turbocharger. The company took the proven K-series engine and lowered the compression ratio from 10:1 to 8:1, and added a turbocharger with the associated plumbing. But, it is a lot more complicated when it comes to managing the boost.

Subaru EJ25 Head Gasket Problems

Most of the EJ head gasket failures occur around the 100,000-mile mark and start as a slow oil or coolant leak.

Honda Electronic Throttle Body Service Tips

Using care and following OEM procedures will help you to avoid unnecessary parts replacement and comebacks.

New Oil Specifications

Many 0W16 oils have a new donut certification mark on the bottle called API SN-PLUS and SN-PLUS Resource Conserving.

Solving Intermittent Overheating

New cooling systems anticipate and influence changes in coolant temperature.

Other Posts

Tensioner Tech Assist

The Lift and Pin is designed to simplify tensioner replacement and belt installation. This video is sponsored by Litens.

Ignition Systems

The ignition coil is a very simple and robust circuit.

Alternator Testing For No Charge Conditions

Many alternator problems turn out to be nothing more than a bad connection at the alternator or a bad wiring harness.

Lifter Deactivation

The area of contact between the lifters and cam lobes is the highest loaded surface inside an engine.