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Old 04-01-2017, 06:24 PM   #1
espbassist88
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Alrighty. ..I have hit a major headache. After rebuilding my OD, it does WORSE than it did before. Pressure before the rebuild was about 450. When cold, it worked flawlessly but when warm, you can forget about using it. The pressure now sits at 250. I used the IPD kit. I was so sure that I had my OD fixed but I've somehow managed to make it worse. I think my next move is to replace the solinoid with another one I have, and to check my releif valve. Anyone have another ideas? I have the J type overdrive. It's from a 1986 740 Turbo. M46 trans. Any help is appreciated!
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Old 04-03-2017, 12:43 AM   #2
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Tell us exactly what you did for the rebuild. Replace the piston seals? Open up the PRV? What position did you set that little (pump pressure) piston on its eccentric? Which fluid? Does the solenoid rattle when you shake it?
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Old 04-03-2017, 09:36 AM   #3
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I did replace the piston seals. I did replace the Pressure Releif Valve orings. I'm fairly sure I added the shims back as well. As for the pump, I'm not quite understanding that question. Not sure about the fluid because my mechanic was replacing some bearings in the main trans so I had him remove the OD so I could rebuild it. He reinstalled it, an the trans as a whole. I don't recall the solinoid rattling. I did test it before reinstalling. Im going to look into it alot more this weekend, if I have time.

If you could elaborate more on the pump question, I'll do my best to answer.
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Old 04-03-2017, 03:13 PM   #4
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Using this parts diagram
I am referring to #10, the sleeve for the fluid pressurizing piston. There is a flat and slot to one outer side of the sleeve. The sleeve must be reinstalled in the same orientation with the slot toward the hole the screen fits into in the bottom of the unit. Otherwise the fluid cannot flow through to the passages. Also, there is a check ball and screen (#17, 18) that likes to fall out of place when reinstalling.
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Old 04-04-2017, 05:59 AM   #5
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Ahhh gotcha! Im fairly sure the spring and ball are installed. I took my time with it. I do question number 10 however. I didn't know they needed to he lined up. So that REALLY makes me wonder.
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Old 04-20-2017, 09:19 PM   #6
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Well I opened the OD up tonight via the cover on the bottom. I looked at everything. Everything looked normal. The sleeve that goes over the pump piston was in line with the piston's flat. I drained the fluid all together and put in 2.4 quarts of Type "F" fluid. Still no engagement. Not even a sputter like it's trying to. Haven't done a pressure test so im not sure where it's at. Last pressure was at 250. I dont understand it. I really don't want to drive this thing around, doing 60 MPH at 3,000 RPM.
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Old 04-20-2017, 09:45 PM   #7
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Quote:
Originally Posted by espbassist88 View Post
I don't recall the solinoid rattling. I did test it before reinstalling.
This is the key. The solenoid can get dirty; take it apart and clean it. Did you replace the solenoid O-rings? You can get a set for less than $10. There is a post on here (if I'm recalling correctly) that details all the sizes.

You can also test the solenoid by turning the key to position 2 with the engine off, shift into 4th, then hit the OD button. Do this with the door open and lean out as much as you can. If the solenoid is working you'll hear it click from underneath the car as you turn it on and off.

As a side note, do you have the solenoid sealing washer? That is vital to retaining all your ATF when you're in overdrive.
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Old 04-21-2017, 02:22 AM   #8
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Quote:
Originally Posted by 504 View Post
This is the key. The solenoid can get dirty; take it apart and clean it. Did you replace the solenoid O-rings? You can get a set for less than $10. There is a post on here (if I'm recalling correctly) that details all the sizes.

You can also test the solenoid by turning the key to position 2 with the engine off, shift into 4th, then hit the OD button. Do this with the door open and lean out as much as you can. If the solenoid is working you'll hear it click from underneath the car as you turn it on and off.

As a side note, do you have the solenoid sealing washer? That is vital to retaining all your ATF when you're in overdrive.
WRT the door open, do it from the passenger side. Less likely to hear Dingggg...Dingggg*snap*Dingggg..., etc. Instead you'll be able to hear it snap and pop as it engages and disengages. Typically, just rolling the window down is enough, since it's pretty loud, but not loud enough to avoid being drowned out by either the dinger or the dying cow used on the 1980-83 cars.

On the washer, that's important, as well as not having a hole in the solenoid where the wires attach. Had a pinhole in a solenoid once. Overdrive lasted about 30-40 miles before it didn't really want to go in.

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Old 04-21-2017, 05:58 AM   #9
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I did chage out the o-rings on the solenoid that was in use with the OD at the time of the rebuild. Once I found out that the OD acted up, I changed it out for another one i had. I didn't change the rings on it but I did test it to see if it worked, simply by hooking up the battery to it. It did move but I don't know exactly how much is too little or anything like that. I do have that washer in use as well. The solenoid I was first using does rattle a little when shaking back and fourth. I don't know if the solenoid I am currently using does that or not. I didn't check the rattling before installing.
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Old 04-21-2017, 06:43 AM   #10
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So as dumb of a question as this is...if the solenoid has a rattle, does that mean it is bad?
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Old 04-28-2017, 04:42 PM   #11
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Anyone else have any ideas? Things to check?
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