Re: 1939 Packard Twelve valve noise

Posted by rhanna On 2016/9/23 11:18:10

Update. I know it has been a while but good things take time. Figured out the valve noise. Turns out someone had previously installed the forward most rocker shaft and silencer assembly backwards. After taking both heads off and the intake / exhaust manifold off I found the problem. Then I realized that I would have to remove the valves, springs, retainers and guides to get the unit turned around so I decided to remove all valves and guides to service all of the silencers. Anyways after 40 hours of work, 2 new valves, all new stem keeper keys 1/32 higher as in the shop manual. It runs perfect and silent. Success..... These are great engines! The root cause of the noise was that the front rocker assembly was not getting oil supply as in the pics.

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