147 Transmission Whine
Ever since I've had it my 147 has had a transmission whine at motorway speeds. It started at around 72 mph, only under load - lift off the accelerator & it stopped - & was present in 3rd, 4th or 5th gear.
Nobody could give a positive diagnosis - one Alfa technician did comment that they had come across this problem but found no fault with the gearbox when it was dismantled.
After a lot of head-scratching I decided the only way of curing it was to replace the gearbox, so I bought a second-hand unit from Autolusso (excellent service!) & had it fitted. Aaarrgghhh - the noise is still there, but starting at lower speeds!
So, have I just been unlucky & stumbled across two gearboxes out of many thousands with an almost unheard-of fault or does the fault lie somewhere else?
I've more or less (wrongly?) ruled out drive shafts as the noise doesn't vary with suspension movement - if it's a CV joint I'd expect it to change as the joint angle changes. It's something which is common to all gears, so I believe it's got to be in the final drive or drive shafts, not the gearbox itself - I thought crownwheel & pinion, but it's an amazing coincidence if I've found the same fault twice!
Clutching at straws, could it possibly be the intermediate drive shaft bearing? I'm sceptical about that, as I wouldn't really expect bearing whine to vary according to whether the shaft is under load or not.
I'm at my wits' end with this one (not, some would say, a very long journey!) so any clues, theories or suggestions would be more than welcome!
Where are we going & why am I in this handcart?