Re: 1939 Packard Twelve valve noise

Posted by fredkanter On 2016/8/9 7:35:44

If the oil pressure at speed is low the problem could be the metering valve, but unlikely. The valve train should be virtually silent on a V12, do you have a few valves ticking or all of them?

Usually the noise is caused by a stuck valve silencer and that usually happens after long periods (years) of unuse.
These are not valve lifters but a novel system of taking up all valve clearance. I would think that a solvent/cleaner like Rislone would do the trick but the car I tried it on had no effect.

If this is the case you need to remove all the valves, make a puller for the valve guides and rebuild the cam follower blocks and silencers. You could have bad cam followers which I recall run on needle bearings.

This project is not for the faint of heart.