51packard -
You wrote:
Quote:
I was thinking the two round parts at the top were pumps because of the slotted looking fitting in them, but now I realize that they are not. You say there are no pistons in the valve body, but aren't those round things pistons? That is what the parts book called them and I assume they push the levers to lock the bands? Am I wrong?
No, you are right that there are two pistons in the valve body of your transmission and that they are used to apply the low and reverse bands.
Might be I was confused on this because my hands-on experience with Packard's automatic transmission has been limited to the Twin Ultramatic, and most of that with in-car service. Beginning with the Gear Start edition, in late 1954, those pistons were part of brake assemblies that were separate from the valve body castings.
Looks like we both learned something, but my real point was emphasis on care and handling of the spool valves.
Meanwhile, it sounds like you have been doing the required reading with the right material. Once you've become familiar with it all, go back and re-read the sections that apply specifically to service and overhaul of the trans in your 1951 (24th Series) car. Don't expect to retain it all, but don't be surprised, either, that all that reading helps you ask better-informed questions.
That said, I can't say what might be the problem with your transmission. Others - like
HH56 and, especially,
Ross - have far more knowledge than I.
Clearly, you're not in a position to do pressure tests in this case, but beyond checking adjustments, sometimes it takes disassembly (like an autopsy) to find what's wrong. As you disassemble the valve body, lay the parts out in order. Just be sure you do that work in a clean area and have a couple of towels laid out for the disassembly - one for dirty parts, the other for cleaned ones.
As for solvents, commercial shops may have fancy cleaning equipment with dedicated solvents, but it really isn't necessary. In fact, the best rebuilder of late-model automatics that I know of gives everything a final rinse with his favorite brand of aerosol brake cleaner. You can also clean out the hydraulic passage with a Q-tip or pipe cleaner.
At this point I don't think any luck is needed - just careful inspection and analysis. The real luck was not burning up anything trying to move the car, but the Ultramatic is better than what some people would have us believe.
Keep posting your findings as you progress with your work, and someone here will likely be able your questions, in due time.
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