Water pump belt and pulley - replaced at 36,000mi

[cleong]

During a routine inspection I noticed my belt was starting to wear:



So bought a replacement belt, and since the shop also recommended a change of the water pump pulley I bought that as well.



Basically no dramas after that, US$50 for the parts, and $20 for half an hour of labour at the local garage fixing it up. Here's how the worn parts look closeup:


Note the groove that's been worn in. This is a steel part. If you're using lightweight aluminium aftermarket pulleys do check yours regularly - this is consumable


Check out the crack that is forming in the belt

[YarisSedan]

Man now would have been the perfect time to switch a aluminum pulley =)

[YarisSedan]

Also BTW turn your belt inside out. I doubt there is any surface cracking on it. I think you may have changed it a little prematurely. But no harm done. I dont really change belts till you see cracks or they begin to squeel. I have never seen a drive belt brake before they start to show cracking or glazing.

[cleong]

I changed my belt because I have a cross-country trip coming up. Thai-built Yarii like mine have had a history of belt squeal and premature wear as delivered from factory, so much that the dealer actually takes the preventative step of greasing that belt with rubber grease to stop the squeal. One owner I know actually had it fray apart 50% at around 10,000mi and changed under warranty. The rest aren't so lucky - usually they are turned away, citing normal wear and tear. Mine has only squealed once on startup, but has also had the belt greased during servicing.