Re: 1952 Ultramatic

Posted by HH56 On 2020/3/6 15:52:45

Can't answer the question on the double seal installation either other than to say it is possible on some Twin Ultras but do not know if there is enough depth in the bore on the regular Ultras which a 52 would be. If you try to install a second seal just be sure the shaft is clean and very smooth where the lip of the new seal will be riding.

Supplementing Don's answer on the difference in shift indicators, regular Ultras have 5 positions and the Gear Start has 6 positions, the 6th being a dot to the left of the drive position which I think may have been changed to a D instead of H on the Gear Start indicator plastic.

On the seals, according to a Packard part number to commercial seal interchange chart someone put together years ago Gr. 3.587 or the throttle shaft seal part number 421372 is the same as an old Victor number 48816. That Victor number crosses to a modern SKF seal 3683. Gr. 3.596 lists as a gasket for the start interlock switch but Gr. 3.590 is the control shaft seal, part 421326 which crosses to a Victor 46016. That Victor number in turn is an SKF 5569.

Napa generally carries SKF seals by their SKF number but if they do not stock them, with the cost of the seal and added freight Napa tacks on to get them into the store it may be that our vendors could match the price or possibly do better.