Worn Out Timing Belt Tensioner

Timing belts need to be replaced at regular intervals to prevent them from wearing out and failing. At my Honda dealership, we recommend replacing them at 100,000 miles. We also replace the water pump, and often replace the tensioner. Over time, the belt tensioner could start to fail, and if the belt is allowed to go too slack, it can jump timing and damage the engine.

A failing timing belt tensioner is usually diagnosed by a knocking noise from the tensioner with the engine running. This car was overdue for its timing belt by almost 30,000 miles, so it’s not surprising that the tensioner had begun to fail. In this case, it was leaking a lot of oil. I sold a timing belt job and began digging into it, but then found another problem.

The tensioner is a small oil-filled piston that pushes against an arm attached to a pulley that the belt rides on. On this car, the tensioner piston and the arm had gotten very worn, leading to the pulley arm needing replacing as well. In this picture you can see the worn area on the part on the left, and the new part on the right. After picking one up from another dealer, I was able to finish the job.


New blog posts every Monday and Thursday, plus pictures throughout the week on Facebook, Twitter, and Instagram!

Watch Mechanical Malarkey on YouTube!

Mechanical Malarkey T-shirts, hats, and stickers are available to order!

-Dan

This entry was posted in In The Shop and tagged , . Bookmark the permalink.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s