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Timing Belt Noise?

nicr4wks

By nicr4wks,
in Engines & Forced Induction

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nicr4wks Experienced

nicr4wks

Posted
Posted

Hi Guys,

I've replaced a couple of timing belts before, but this is the first Gates one I've done. There's a noise coming from the cam gear area which I think is the noise of the belt teeth against the gears. I've heard the Gate's belts can be noisy but this seems pretty excessive and I'm thinking I might need to loosen it up a bit.

Can anyone confirm?

Cheers.

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https://www.sau.com.au/forums/topic/458823-timing-belt-noise/
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nicr4wks Experienced

nicr4wks

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  • Author
Posted (edited)

Should point out the idler and tensioner were replaced at the same time, along with the water pump. Prior to all this there was no noise from the old belt!

You got spacers for the cas? Seeing as not running the cover?

Yes the CAS has spacers, it's also only temporarily removed for diagnosis of the noise.

Edited by nicr4wks
Dobz Experienced

Dobz

Posted
Posted

It does sound like a humming of the belt teeth but the sound quality makes it hard to distinguish. I've heard a/c idler bearing make the same sort of noise when they're on the way out but you say it's up at the cam pulleys.

How tight is the belt?

nicr4wks Experienced

nicr4wks

Posted
  • Author
Posted

It does sound like a humming of the belt teeth but the sound quality makes it hard to distinguish. I've heard a/c idler bearing make the same sort of noise when they're on the way out but you say it's up at the cam pulleys.

How tight is the belt?

http://www.sau.com.au/forums/topic/397602-how-to-replace-a-timing-belt-202526-pics/

As described in this guide, I can get roughly 1/4 turn out of the belt. It doesn't feel overly tight.

Dobz Experienced

Dobz

Posted
Posted

That method of a 1/4 turn isn't the most accurate. There are too many variables that can change like hand strength, how you hold the belt when you twist and if you can position yourself to get better leverage on it.

The best way I was taught and I feel its the most consistent is to pull the slack of the belt in between the cam pulleys so the rest of the belt is tight. The slack inbetween the pulleys can now be measured. Putting a ruler behind the belt it should only have about 6mm movement, that's +3, -3mm from centre.

nicr4wks Experienced

nicr4wks

Posted
  • Author
Posted

Loosened up the belt last night, noise gone!

Dobz method seems pretty solid, I also found the belt "feels" the tightest between the two gears, I guess this is due to it being the shortest run between two points.

mr skidz Veteran

mr skidz

Posted
Posted

my recent squeal once car warmed up turned out to be the tensioner bearing and possibly the gates belt which was on the car already which doesn't flex as well as the original one so some excess tension was put on the bearings causing them to squeal due to the expansion of the engine as it warmed up something to think about

tridentt150v Grand Master

tridentt150v

Posted
Posted

Thats just the killer wasps!!!

Thankfully mine doesn't make that sound......when I did it I just ordered a kit for the water pump, idler, tensioner, and belt. Belt that came was a Gates........I didn't think about it, but prob should have requested OEM.

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