quack noise... but can't find a duck!

[TVR Beaver]

Quaaaaack... as we pass through 1800 RPM when hot and under load... it's a bearing I'm guessing but nothing at standstill yet... just when running and hot??.. its getting worst so will become apparent I guess... but anyone any ideas?....
Is it a water pump noise?.. alternator... PAS pump.. or tensioner (please ) .. taken the belt off and they all appear okay.. the water pump stops on the seals and does have a tad of movement.... not that I'm off far... but would like to get it before it gets me

Edited by TVR Beaver on Monday 25th July 18:28

[bluezeeland]

Why would a bearing/pump/alternator 'quack' at 1800 rpm ? Sounds like something vacuum related.....

[TVR Beaver]

Have you never heard a dry bearing on its way out?... they can make all sort of funny noises at one frequency or another... and its getting worst.. so something is going?... what vac could make the noise?... BTW car is running spot on other that the quaaaack

[bluezeeland]

at 'just' 1800 rpm ? simply hinting towards 'other' poss

You'll figure it out, after all your the beaver..........

[TVR Beaver]

well as it gets worst I'm sure I'll locate it.. but at the moment I can't even get it to do it by reving it.. guess it rate of rise of RPM.. tension on the belt maybe... got to be spot on to get it going... by 2K its gone....
annoying....