Re: Noisy hydraulic tappet?

[Wolff <wolff_b@ix.netcom.com>]

> Hi Flemming;
> 
>     Noisy tappets are fairly common on Audi engines; in fact the Bentley
> mentions this and says it's not a problem unless the noise doesn't stop
> after the engine warms up. I think it mentions running the engine above 2000
> rpm to see if the noise stops. I've noticed noise from the tappets on my MC
> engine a few times; usually after it has not been run for a week or so. It
> always stops after the engine runs for 30 seconds or so.
> 

The viscosity of the oil makes a difference for me. Too thick or too
thin and you get tapping. Redline 10-40 is quiet from 40 deg F to 70 deg
F tested so far on startup of my 4kq. Syntec 20-50 was much noisier
under same temps.
Wolff