172 cup belt noise

[RIC172]

Hi I was driving home earlier and noticed a loud tapping noise coming from the engine (increasing the revs made the tapping noise a lot louder).

I stopped the car straight away and looked under the bonnet to see feint pieces of thread on top of the engine. I immediately looked at the aux belt and noticed it was catching on one side of the pulley and was therefore being slowly stripped apart :-0

I understand it’s a quick and easy job to replace the aux belt on a 172 cup but the noise was the concerning thing. Also can someone take a look at the attached photo as the pulley looks as though it may be faulty seen as there is no groove for the belt to run on?

 

[bloke]

the belt is on so you won't be able to see them.

 

[RIC172]

the belt is on so you won't be able to see them.

Oh ok fair enough, are the grooves just in the inner part of the pulley as I can see part of the pulley in the photo

 

[bloke]

are you talking about the waterpump pulley?

 

[RIC172]

are you talking about the waterpump pulley?

Ah I probably am as I don’t know what I’m looking at. It’s the pulley at the rear of the photo where the barcode is on the belt. It looks like the belt could just skip straight off as there are no grooves. Does the belt run both the water pump and alternator on a cup?

 

[bloke]

ah, that's the crank pulley, it is grooved but as the belt is on it you can't see them. the smooth pulley is the waterpump pulley, the belt comes off the crank pulley and then goes under this one so is smooth as it's driven by the back of the belt.

 

[RIC172]

Oh I see, cheers mate. So if the aux belt needs changing, would you recommend the water pump gets done at the same time? The timing belt was only done a few months ago.

 

[bloke]

I normally see how the pump feels on them, dead easy to do it on a cup compared to normal one.