Re: Pneumatic clutch

Posted by HH56 On 2017/8/30 9:08:26

The big issue on a non operating unit is if over the years any of the components have been removed. Back in the days when Packard parts and expertise were hard to come by, rather than try to fix a non operating unit it was turned off or otherwise disabled. Since some of he components block access to other items that might need service an EC component was frequently removed and not replaced if the unit was disabled and not working.

The major failure items on postwar units is the rubber diaphragm and the steel cable on the power unit which operates the clutch linkage. Both items are reproduced. The other item which may have issues is the solenoid valve which controls the vacuum supplied to the unit. If the rubber seal on that has hardened or cracked it will need replacement. I have seen the valves on ebay so they are available but don't know how plentiful they might be. With exception of one other rubber piece the rest of the unit is all metal and should give very little problem if a unit is placed back in operation.

The postwar unit is quite different in how it operates than the prewar unit. Postwar is much simpler electrically and mechanically so not as much to act up. Adjustments can be a bit finicky but once done they seem to hold fairly well. IMO, the biggest disadvantage to the Packard unit is there is only adjustments for one driver. A second driver may not expect or like the action as it is dialed in and may not appreciate the way it works or feels. For either driver, turning the unit off is as simple as pushing a button and the car operates as if the option was never there.