727 pump not activating

[EccentricMagpies]

Then motor (360) and transmission were recently rebuilt and placed back into the car. Motor is running fine and I went to add oil to the transmission.
Prior to starting the car i placed 4 quarts of oil in the transmission.

After starting and idling in neutral I checked the dipstick prior to adding more oil. It seems that the pump is not engaging? The stick read full still

I thought to pull the transmission and have a shop take a look and someone mentioned that perhaps the torque converter isn't engaging with the pump?
Can the trans and motor even bolt up with the torque converter out of position?

is there an definitive way to test this out?
If I can save an appointment with a shop I guess that's all the better.

 

[David Stillie]

Does the car move?

 

[Fran Blacker]

Was there a 1/4" to 3/8" space between converter and flex plate when you bolted convertor to flex plate? If there was no space you might not have pump tangs engaged. When you install trans make sure convertor is engaged with tangs and put a c clamp along bottom until your ready to bolt convertor to flex plate, so it doesn't disengage while installing trans.

 

[EccentricMagpies]

Does the car move?

No.. when I checked the fluid in neutral and seen it reading full. I thought I might as well try reverse and drive. Nothing happened.

Was there a 1/4" to 3/8" space between converter and flex plate when you bolted convertor to flex plate? If there was no space you might not have pump tangs engaged. When you install trans make sure convertor is engaged with tangs and put a c clamp along bottom until your ready to bolt convertor to flex plate, so it doesn't disengage while installing trans.

Well, i'm in the middle of removing the transmission now. I have the starter pulled, flex plate bolts removed and of course the shield is off.
This evening I was going to pull the linkage, lines, driveshaft and then tomorrow finish removing it completely.

I can certainly take a photo of what it shows now?

 

[66Satellite47]

Getting the pump drive tangs engaged can be a pain. Before putting the converter into the trans, look to see where the tangs are oriented, then as you slide the converter on to the input shaft, be sure the slots are close to aligned with the tangs. Wiggle & turn the converter back & forth a little while pushing it lightly till you feel thud into place. May take numerous tries.

 

[EccentricMagpies]

First photo is directly after pulling the flex plate bolts.

second photo is after spinning the converter maybe one rev.

 

[EccentricMagpies]

Getting the pump drive tangs engaged can be a pain. Before putting the converter into the trans, look to see where the tangs are oriented, then as you slide the converter on to the input shaft, be sure the slots are close to aligned with the tangs. Wiggle & turn the converter back & forth a little while pushing it lightly till you feel thud into place. May take numerous tries.

So as it sits now it hasn't fallen into place? Wouldn't that leave a large gap between the flex plate and converter?

can this be accomplished while it's still mounted as the photo's show?

 

[Don Frelier]

Looks about normal if it wasn't engaged it would press firmly up against the flexplate.
The flexplate itself looks odd though?
Maybe just the picture.

 

[Dipstick]

If the tangs weren't engaged it would be the opposite, no gap between the flexplate and the lugs.

My guess is you broke the tangs on installation or they broke after startup.

 

[66Satellite47]

You need to drop the trans out & get a good look at the pump tangs to be sure they aren't broken.

 

[Fran Blacker]

Agree^^^ When you pull convertor take it straight no turning and note where tang slots are on convertor. Then look inside and see if tangs are where they were on convertor or if they're broken. If tangs look like they could have lined up might be another problem???

 

[EccentricMagpies]

Okay.. thanks everyone. I'll continue pulling and post more questions if they come up.

 

[Demonic]

Torquflites have 1/8" pipe plugs for checking pressures. A 100 psi gauge and a long hose with 1/8" npt threads are needed. The line pressure tap is the middle of the right side. The one by the dipstick is kickdown servo release, line pressure is behind it.

 

[Mick56]

Before pulling the trans, I would call whoever did the rebuild and see what ideas they might have.

 

[mopar 3 B]

If the pump drive looks ok. Could be the valve body did not get put together correctly and is blocking flow into the convertor. It has happened before.

 

[Fran Blacker]

Okay.. thanks everyone. I'll continue pulling and post more questions if they come up.

Questions, yes what find yes yes.

 

[Ernie ingling]

Good points made one question was the torque converter filled with tf before install?

 

[69Bee]

Looks about normal if it wasn't engaged it would press firmly up against the flexplate.
The flexplate itself looks odd though?
Maybe just the picture.

It is a B&M flexplate with the half-moon cutouts for balancing.

 

[69Bee]

If the tangs weren't engaged it would be the opposite, no gap between the flexplate and the lugs.

My guess is you broke the tangs on installation or they broke after startup.

View attachment 956364

And even if the tangs are there, the pump could be smashed internally out the back of the pump. I had a customer keep tightening the bolts because it would "pull the transmission to, or fk it up", it accomplished the latter...

 

[EccentricMagpies]

Good points made one question was the torque converter filled with tf before install?

No. I do not believe so. (I didn't put them together initially so I cannot be sure)