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[madmax]

changed aux tensioner today but noise still there sounds like rattle of some sort more noticable when starting from cold and i cant make out where its coming from seems to be front of engine passenger side had a new cam belt kit fitted at 136k done 146k and water pump, when i slacken aux belt the noise goes thats why i thought it was tensioner any ideas greatly appreciated!!!!

[Elite Pete]

Youve got the aircon compressor and the power steering pump on the passenger side both run by the Aux belt.

[madmax]

there is a tapping noise when i switch air con on might have got worse...

[madmax]

there is a tapping noise when i switch air con on might have got worse...

my dad says its something to do with crankshaft!!

[megaomega123]

Crankshaft is bottom centre. More likely to be power steering pulley or air con if passenger side.

[madmax]

its hard to tell sounds very rough when you blip engine but it seems to be vibrating through the plastic cover on cam belt  

[ffcgary1]

 Hi madmax, i would stop the motor and check that all is good with the cam belt and rollers..Did you change the rollers as well as the belt, as it is the rollers that fail.

[ffcgary1]

Just noticed that a kit was fitted, was it gen vx kit?

[Tafty]

I had something similar - but tapping noise (passenger front side too) would only appear when the engine was getting hot.  Root caused it to a loose centre upper idler (shown below )

.

Was causing the cambelt to flap and give off a serious smell of melting rubber too. Anyhow - fixed it by replacing the tensioners, belt etc.  I think I was really close to having the engine written off with that one. By the way my cambelt wasn't due to be changed for another 13K so even the 40k cushion doesn't always protect you Never assume!! 

[hotel21]

The engine will run with the aux belt removed.  Try it and see if the noise is still there or if it goes when removed.  If still there its directly engine related - crankshaft like Dad says or more probably something just as important such as timing belt/tensioners.  Try switching the aircon on and off to see if it makes any (noise) difference.

If noise goes with belt removed then its either alternator, water pump, aircon pump or power steering pump or indeed the tensioner itself as you have perhaps worked out.

Have a try then ask back.  Remember to take a picture of the run of the aux belt to avoid probs trying to get it back together again.

[madmax]

cheers for advice guys better keep it of the road till i can get a proper look....i cant remember if it was genuine vx cam kit i used normally get my parts from vauxhall spares centre in romford i have had a lot of gm parts from them....any one no the price for cam kit from main dealer!!!!!

[CaptainZok]

£143 retail £128.70 trade £89.08 TC all plus vat

[Markie]

...and if that noise persists with aux belt off dont drive it - come back and lt us know !!

[madmax]

thanx for the advice guys turns out it was waterpump should have realised really cos i had been topping up with coolant a bit more lately i think last year when my oil cooler went messed it up a bit cause its not that old, while everything is stripped down im gonna clean breathers and idle valve, never done it since purchasing car and there is some excellent advice on here on how to clean them!!!!!!ps you lot if you ever down in sunny essex the beers on me!!!