Re: need sticking valve solution

Posted by Tim Cole On 2014/7/20 6:22:34

Hi bujak:

The big risk is the valve sticking partially open and damaging the cam rollers.

With a worn motor your problem is the result of corroded/pitted stems and guides. So given how expensive Packard motors are I would consider replacing the valves and guides.

Before new parts were available the old timers used to clean the guides and polish the stems. So you can try that as well.

Also, heavy oils don't mist as well as lighter oils. The manual specifies 20w for your car up to 85F so you can try 10w-30 if the motor is using detergent. Marvel oil has the same effect. Note as well that Packard explicitly stated using the next lighter grade over the next heavier grade. As long as you are not running the car over 45-50mph and not lugging the lighter grade should not be causing problems at the rod bearings.

Hope this helps.