I'd try the old screwdriver to the ear diagnosis trick......with the engine running, put a big screwdriver handle against your ear and move around the engine, pressing the blade end onto various parts of the casing....it'll be obvious where the noise is greatest....at which point it'll be easier to suss out the likely offender.....as davidoft suggested....a stuck cam follower would sound like this, but it's notoriously difficult to diagnose from vid sound tracks if you don't want to remove a valve cover, put the screwdriver blade against each pushrod tube in turn....mahoosive valve lash will be more than obvious
when new, was it a tur(n)key engine? FTFY ....would it have been so hard to type that in the first place ......Keep up at the back. Could it be a loose brush holder in the alternator .....damaged alternator bearings giving a bit of play causing fan to rub?
It sounds like my old injun when cam follower stuck slowly mashed the cam lobe and them had no adjustment on valves either side on that lobe ! Hope it's way more simpler mate !!
Wasn't going to get drawn into this.... but, it sounds very much to me that there is a flock of turkeys in that engine bay. Do I win a meat hamper.
So I have left it and given it a damn good ignoring and it seems to be OK now. However, after leaving it and not being able to get the sound to come back I took it for a test drive and again all was fine. So, I then let it sit and I checked the oil level, confession time, it was a bit low. As in just touching the bottom line. The noisy lifter is now quiet after a bit more oil. Could it be that simple? And yes I know I am that simple. Will use it tomorrow with radio up loud, i mean off,and see what happens!!
think it was another of our meat related puns!!! hopefully you've sorted it now I'll keep my fingers crossed for you
Completely missed that one. If it makes the noise again I will be looking at Alternator though. I think that was a pretty good shout.