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[car5car]

engine.

Same about other bearings: water pump, alternator, driving belt tensioners, AC compressors.
Maybe it is a good idea just to listen your engine instead of replacing timing belt kits every 40K miles?

[Nick W]

They don't always get noisy first. In fact, they often don't get noisy at all, just suddenly silent.
There are lots of examples of different engine cambelts failing just a few thousand miles over the recommended limit, whatever it might be. The same thing applies to not changing the tensioners; not doing so to save money rarely works. Many garages will refuse to change a cambelt without doing the whole kit, as they learnt the hard way it's not worth the hassle of explaining a few months later why the bill to fix the damage is so high.

[Lazydocker]

engine.

Same about other bearings: water pump, alternator, driving belt tensioners, AC compressors.
Maybe it is a good idea just to listen your engine instead of replacing timing belt kits every 40K miles?

Good advice to listen between changes but the full kit must be changed every 40k or 4 years... There have been instances on here of tensioners failing within a few thousand miles of the due change after people have decided to gamble

[tunnie]

Noise is irrelevant. Cambelt and tensioners must be changed every 4 years / 40k

[tidla]

Wasnt the original tensioners/idlers made of plastic which broke up?

Whos idea was that?

[Andy H]

Wasnt the original tensioners/idlers made of plastic which broke up?

Whos idea was that?

Auxiliary tensioner pulley is plastic.

Pretty certain that the timing belt pulleys have always been steel.