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Re: Back to the Ultramatic Lockup
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Home away from home
 
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First, here's the hydraulic charts. Note that some valves changed with time. These show the later Direct Shift Valve, for instance. Not sure which one you would have, perhaps the older one.packardinfo.com/xoops/html/modules/newbb ... 7475&post_id=262827#forumpost262827
These are clearer and show the 1949 everything.packardinfo.com/xoops/html/modules/newbb ... =534&post_id=274984#forumpost274984 Then the parts diagram...packardinfo.com/xoops/html/modules/parts ... PlateNumber=143&partslist=1948-1954 As you can see on the charts there is only so much going on in the circuit. If the pin in the valve body, separating the DD valve from the modulating valve, has been removed, then this symptom is expected. Do you remember if you had to remove it and if so, if you reinstalled it? If that's OK, I would check and make sure the converter inlet valve is there, as if not, it will short the DDC circuit to the converter circuit. Keep in mind that bourdon gauges will read 0 at under 5 PSI.
Posted on: 6/2 7:36
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1955 400 | Registry | Project Blog
1955 Clipper Deluxe | Registry | Project Blog 1955 Clipper Super Panama | Registry Email (Parts/service inquiries only, please. Post all questions on the forum.) service@ultramatic.info |
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Re: Back to the Ultramatic Lockup
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Home away from home
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Quote:
To confirm, “then up to the lockup pressure” indicates that that the pressure is in the Direct Drive is in the engaged range. What value did you get? Quote:
Did you measure the governor pressure to know that it is working correctly? Quote:
On 3/20, you wrote “ I have type F in it right now”. Did you change the fluid, you hadn’t listed in it previous posts? If so has the fluid gotten blacker as though it was removing “ a ton of black looking oil” from other places, not just the modulating valve? Finding gunk causing one operation to fail should make you wonder if there is more gunk other places that you can’ see. Quote:
Did the DDC pressure go “up to the lockup pressure” as in the previous test? If there is an “open hole”, it wouldn’t go “up to the lockup pressure”. Have you run pressure tests on the rest of the transmission to determine the rest of the condition?
Posted on: 6/2 11:41
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Re: Back to the Ultramatic Lockup
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Home away from home
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Good point Mike...
Paul, where are you getting the 15-20 PSI figure from? The DDC pressure is supposed to be zero on disengagement. The engagement pressure is 75-90. Engagement is at perhaps 20 mph on light acceleration.
Posted on: 6/2 12:42
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1955 400 | Registry | Project Blog
1955 Clipper Deluxe | Registry | Project Blog 1955 Clipper Super Panama | Registry Email (Parts/service inquiries only, please. Post all questions on the forum.) service@ultramatic.info |
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Re: Back to the Ultramatic Lockup
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Quite a regular
 
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Quote:
I have drained the fluid several times since i got the car running, but I just got around to working on the transmission... I have probably put 1500 miles on the car since i got it.. The transmission seems to function normally it just dosent go into direct drive... by that i mean all the gears seem to engage well and there is no slippage of the clutches.... To your point the black oil from the modulation valve may mean others are stuck as well... I can say that the governor, the direct drive valve are free because i removed and cleaned them... also i can see where the book calls "vent" to me means, ported to exhaust or as i said "open hole" so i can see where the pressure could be zero... I thought i read somewhere in a chart where it said 15-25 lbs disengaged, and 60-80 when the direct drive clutch is activated... Anyway is there any other possible cause that does not require removal of the transmission, that i have overlooked.... Thanks to all Paul
Posted on: 6/2 14:43
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Re: Back to the Ultramatic Lockup
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Home away from home
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All the gears? There is only one! Maybe your transmission is working just fine???
Posted on: 6/2 15:04
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Re: Back to the Ultramatic Lockup
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Home away from home
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Quote:
Well, everything that I already mentioned only requires you to double check the valve body and do the DD pressure test correctly. I mentioned them as they are both logical possible causes and not very difficult to check. Are you planning to check on those? Another possibility is your throttle pressure being extremely out of whack. If you are in kickdown then it won't go into direct. Loosen the front jam nut on the transmission throttle linkage, set the carb to low idle, and see how far forward you can push the transmission linkage with normal finger pressure. If there is a huge distance then it just needs to be adjusted forward a bunch. The throttle pressure problem can also be caused by some mistake in the reassembly of the throttle valve. Quote:
I assume this means that H, L, and R make the car drive well? If you are feeling a "shift" in H or L at 20 to 50 MPH, that is your DDC engaging.
Posted on: 6/2 16:25
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1955 400 | Registry | Project Blog
1955 Clipper Deluxe | Registry | Project Blog 1955 Clipper Super Panama | Registry Email (Parts/service inquiries only, please. Post all questions on the forum.) service@ultramatic.info |
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Re: Back to the Ultramatic Lockup
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Quite a regular
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Hello, by all the gears i mean H, L, R.... It does not attempt any type of shift while driving...
Thanks Paul
Posted on: Yesterday 5:44
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Re: Back to the Ultramatic Lockup
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Quite a regular
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After looking at the hydraulic schematic, it appears to me that the converter inlet valve could possibly be stuck.. I think that would give the same symptom as well.
My thinking, if the converter does not dump, then you have the same pressure on both sides of the direct drive clutch.... Much the same as what happens when you have bad bushings and too much pressure leakage into the converter.... Is this possible?? i have pretty much cleaned everything else... thanks Paul
Posted on: Yesterday 8:03
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Re: Back to the Ultramatic Lockup
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Home away from home
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That's correct but it won't explain why you would have 0 pressure on the DDC circuit at speed, if that's what is happening.
If you have the correct pressure on the DDC circuit at speed and still no engagement, then I think you have made a prescient diagnosis on the inlet valve. Or the bushings like you said.
Posted on: Yesterday 8:09
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1955 400 | Registry | Project Blog
1955 Clipper Deluxe | Registry | Project Blog 1955 Clipper Super Panama | Registry Email (Parts/service inquiries only, please. Post all questions on the forum.) service@ultramatic.info |
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