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[dubiez]

The engine sounds a bit rough at idle on the side of cams 3 and 4 (valve like sound), that clears up when revving up. Clackety sound comes comes back as soon as idling back.
Any idea what it could be?

I found the cause of the noise, I had forgotten to tighten the pulleys after fitting the belt 
I realised just in time, I'd already lost a bolt on the crank pulley 

[Entwood]

The engine sounds a bit rough at idle on the side of cams 3 and 4 (valve like sound), that clears up when revving up. Clackety sound comes comes back as soon as idling back.
Any idea what it could be?

I found the cause of the noise, I had forgotten to tighten the pulleys after fitting the belt 
I realised just in time, I'd already lost a bolt on the crank pulley 

Ouch .. that could have been VERY expensive, hopefully nothing moved very far ....   

[dubiez]

All the pulleys stayed on, i'd only gone as far as backing the car out of my garage when the noise got worse, i open the bonnet to investigate and saw the power steering pulley wobbling a bit. I then ran into the car to switch the engine off.
Would have been also MUCH easier to tighten the all the bolts before putting the air intake back in!

[footloose]

Also make sure the notches in the cam pulleys line up with the notches on the cam cover back plate.

[TheBoy]

Also make sure the notches in the cam pulleys line up with the notches on the cam cover back plate.

Not accurate enough. As OP has recently done belt, presumably has the correct timing kit, which I'd recommend using to double check nothing has slipped.

[Andy H]

Also make sure the notches in the cam pulleys line up with the notches on the cam cover back plate.

Not accurate enough. As OP has recently done belt, presumably has the correct timing kit, which I'd recommend using to double check nothing has slipped.

Why would the cambelt be affected?
The pulleys that are held on by little bolts are the aux belt pulleys. The aux belt didn't jump off so presumably didn't make contact with the cambelt cover.

[dbug]

Also make sure the notches in the cam pulleys line up with the notches on the cam cover back plate.

Not accurate enough. As OP has recently done belt, presumably has the correct timing kit, which I'd recommend using to double check nothing has slipped.

Why would the cambelt be affected?
The pulleys that are held on by little bolts are the aux belt pulleys. The aux belt didn't jump off so presumably didn't make contact with the cambelt cover.

Yep think op meant pulleys on auxillarys, ps pump etc, not cam belt pulleys

[TheBoy]

Also make sure the notches in the cam pulleys line up with the notches on the cam cover back plate.

Not accurate enough. As OP has recently done belt, presumably has the correct timing kit, which I'd recommend using to double check nothing has slipped.

Why would the cambelt be affected?
The pulleys that are held on by little bolts are the aux belt pulleys. The aux belt didn't jump off so presumably didn't make contact with the cambelt cover.

Ah, my bad, saw pulleys and people talking of cambelts....