Still enjoying the
world of Alfa :-)
Join Date: Jun 2006
Location: United Kingdom
156 V6 24v - Tappety noise when cold at 1500rpm
Good day fellow Alfa drivers.
My trusty 156 has recently developed a tapping noise for the first mile or two of driving, only audible when the engine reaches about 1500rpm.
The other day I opened the bonnet and had a listen while I brought the revs up and I could confirm the noise was coming from the top of the engine.
If I run the engine for a minute or two on the driveway before I pull away it's fine, so clearly once it has warmed a fraction and the oil has got where it needs to go it sorts itself out.
The sound does sound like the old tappets sound on the old OHV engines, but I know the V6 is DOHC and I know there are shims in there.
Now in your experience, would the sound of worn or misadjusted cam gear cause it to tap constantly and at all engine speeds or is it tapping only at 1500rpm when stone cold a possibility too. Are they likely to just need adjustment?
It had an oil change last summer, and the oil level is on max. It did cross my mind that I might have an oil starvation problem, but then surely I'd get tapping at idle too.
Now I try to keep local driving to a minimum but as my gf doesnt drive I have found myself having to pick her up from local addresses in the dark so it has had a few short runs. Whether this could of had something to do with it I don't know.
Any advice or tips would be appreciated before I get anyone to look at it.