350i screamed like a banshee

[Pilo-Wedgebits]

After I changed the AFM pipe first thing I started the 350i up to warm her up prior to changing the oil. The engine screaches like a banshee when you rev it up - any ideas what the likely culprit is? waterpump?

Cheers

Shaun

[peaktorque]

Power steering or waterpump / alternator belt?

[Pilo-Wedgebits]

Its a new alternator belt because the old one snapped, as it appears to have been rubbing on the swan neck. I topped up ps fluid. I notice quite a lot of rubber "flakes" deposited around the engine bay but I think thats from the old belt and was being flung around by the new one. I will try to tension the belt a bit more when I have regained oil pressure. What is the best way to diagnose the fault if tightening the belt makes no difference?

Cheers

Shaun

[peaktorque]

A long bit of wood held between your ear and potential noise emitting components

Or a bit of a pain, but take of one of the two belts to see if the noise disappears...
It should point you in the right direction of the culprit.

Edited by peaktorque on Saturday 30th January 22:50

[Wedg1e]

Shaun: if the alternator belt is too tight, that'll also cause screaming as it puts excessive side loading on the bearings.