HOW TO DIAGNOSE BAD IDLER PULLEY BEARING

Summary

In this video, the presenter demonstrates how to diagnose and replace a worn idler in a serpentine or accessory belt system. Common signs like groans, squeaks, or rattles indicate potential issues, and the presenter shows how a failing idler can cause belt derailment. The video walks through inspecting the idler by spinning it, checking for noise, and comparing a damaged idler to a new one. The importance of early detection is emphasized to prevent catastrophic failures. Viewers are also encouraged to comment and share their experiences with similar issues.

Takeaways

• 😀 Diagnosing a worn idler in your serpentine or accessory belt system is crucial to prevent further engine damage.
• 😀 Common signs of a worn idler include groans, squeaks, rattles, and bearing noise that changes with engine RPM.
• 😀 If the idler fails, it can cause the belt to derail and potentially damage other engine components.
• 😀 Spinning the idler manually can help identify if it's worn or producing abnormal sounds like grating or grinding.
• 😀 Belt tension must be relieved before inspecting the idler, allowing for easier testing and identification of wear.
• 😀 A worn idler will often have grit or noise when spun, while a new one will be smooth and silent.
• 😀 It's important to replace worn idlers before they fail completely to avoid catastrophic belt failure.
• 😀 A 13mm bolt is typically used to remove the old idler and install a new one.
• 😀 New idlers are silent when spun, indicating the bearing inside is intact and functioning correctly.
• 😀 Regular maintenance, such as checking the idlers and belts, can prevent costly engine failures down the line.
• 😀 Catching idler issues early helps avoid more serious mechanical failures that could affect the accessory drive system.

Q & A

What is the purpose of diagnosing an idler on the serpentine or accessory belt system?

The purpose of diagnosing an idler is to check if it is worn or failing, as it could lead to noise, damage to the accessory belt, or even a complete failure that could scatter the belt and cause further damage to the engine.

What signs should you look for to identify a worn idler?

Signs of a worn idler include groaning, squeaking, or rattling noises. Additionally, a rough or gritty feel when spinning the idler could indicate a failing bearing inside the idler.

Why is it important to replace a worn idler on time?

It is important to replace a worn idler on time to prevent catastrophic failure, where the idler seizes or detaches, causing the belt to derail and potentially damaging other components in the engine.

What is the first step to check for a worn idler on the accessory belt system?

The first step is to release the tension on the belt, allowing you to check the idler by spinning it or feeling for any abnormal noises or play.

How can you physically test if an idler is worn out?

You can physically test an idler by spinning it by hand. A smooth, quiet spin indicates a good idler, while a gritty or noisy sound suggests the bearing is worn out.

How do you release the tension on the belt to inspect the idler?

To release the tension on the belt, use the tensioner to relieve the pressure on the belt. Once tension is released, the belt can be slipped off, allowing you to inspect the idler.

What happens if the idler bearing fails completely?

If the idler bearing fails completely, the idler could seize or detach from its position, causing the accessory belt to derail, which could damage the belt and other engine components.

How do you know when to replace the idler?

You should replace the idler if you notice any noise, roughness, or abnormal play while spinning it, or if the bearing shows signs of wear. If the idler sounds gritty or produces unusual noises, it is time to replace it.

What are the consequences of ignoring a failing idler on your vehicle?

Ignoring a failing idler could lead to further damage to your accessory belt system, potentially causing the belt to break or derail, which can lead to engine damage, and expensive repairs.

How can you tell the difference between a new and a worn-out idler?

A new idler is silent and smooth when spun, with no grit or noise. In contrast, a worn-out idler produces a gritty sound or feels rough when spun, indicating that the bearing inside is damaged.