Engine noise

[markybug]

Not brilliant video of the belt noise. 
 

Seems to happen at 1500 revs any time i notice it ?

[markybug]

So car had its mot/service and 4 new tyres today. 
 

They checked the belt squeal and say it’s the belt tensioner ? Forgot to ask if the original garage that replaced the water pump and belt should have replaced or checked that also but wouldn’t really have helped. 
 

So will require another trip at some point for that. 
 

 

[markybug]

So….. after having the car in the garage (different one from the water pump replacement garage) they recommended and replaced the Aux drive belt tensioner.  
 

Drove away and it’s still f*****g squealing!

Getting fed up with this issue/garages/car …

[Cyker]

Ahh I remember Squealy Belt was an annoyance for me this time of year too in my old Mk1! Sounded like a cat was being tortured in my engine bay!  

If the garage replaced the belt I bet that is the cause - They usually use third party belts and THEY ALL SQUEAL!!!

I don't know why but only the Toyota genuine belts don't seem to squeal. This might only apply to the Mk1, but so many people here over the years have put in third party aux belts to fix the Mk1 Yaris Tortured Cat Syndrome, even blue print and continental-branded ones, and they all start squealing within a few months, and even trying tricks like spraying water or WD40 on the belt (quietens it for a bit but it comes back. also flings WD40/water all over the engine bay) don't really help, but eventually they get a genuine toyota belt and hey presto it's back to normal!

 

[flash22]

ah they didn't bother cleaning the pulleys, when a belt slips in deposits all sorts of junk on the pullies - a can of brake clean and a wire brush should sort it

[Cyker]

That's a good point - It does help if all the pulleys are cleaned before a new belt is put in!

I wouldn't use brake cleaner, but if you do, make sure you do NOT spray it anywhere, just into a cloth and wipe them down with that, and make sure the surface is clean and dry - Brake cleaner is vicious stuff and attacks rubber like crazy - It will quickly degrade the belt and any rubber hoses it gets on, so be very careful with it and make sure it's all wiped off and clean before putting a new belt on!

 

[Stevie J]

My Mk2 used to do it - horrendous when started from cold, squeaking and chirping - really embarrassing to be honest - I tried changing the belt from the original to a Dayco belt, but noise came back within a few weeks, and I eventually put it down to a belt pulley misalignment causing the belt to slip over the smooth faced pulley rather than the grooved ones, as they back of the belt goes the reverse way passing over a smooth pulley and I think that was where the slippage was occurring. If any of the ancillary component pullies like the alternator, water pump, idler, or a/c compressor are not completely in alignment with the rest of the pullies, it will lead to problems. It didnt help the Mk2 did not have an auto tensioner either, but the Mk3 does.

If any of the components have been replaced, such as the water pump, it may not be a genuine part, so the pulley may not be perfectly aligned, and that may be the root cause of the belt slippage. It is an annoying and difficult problem to solve once it starts happening, and I never solved the issue on my Mk2 - it did its cold start squeaking for 6 years until it had to be scrapped. It always stopped the noise though once the belt and pullies warmed up, so I only had to put up with it for the first part of my journeys. Damp, cold weather did make it squeak for longer before shutting itself up though.