[chipmechanic]

I was doing a stall test on my new converter and it revved up once to full stall ( 4000 rpm ) with the transmission brake on then then the engine died. After a couple of attempts I managed to get it restarted but the transmssion wouldnt go into gear. Well the shifter went into gear but the transmssion wouldnt respond. No driveshaft movement. No line pressure...nada.

Heres the culprit ...

http://users.adelphia.net/~mikeandnatasha/brokedick.jpg

. It also looks like the bottom sealing ring on the pump wasn't sealing . Still has the paint stripe on it. I'm thinking the pump was starved for fluid when the transbrake was on and up to speed and the the outer pump gear locked up in the pump housing and took out the inner gear . The outer gear id FROZEN in place in the pump housing. Good news is that I have another pump to rebuild and a spare set of new pump gears although those gears were new too. I may reuse OEM's. Also it doesnt look like there is any other damage in the transmssion . I'll recheck the clearances and clean it all up but it looks good and clean inside. Anyway does anyone know of a source for teflon pump seals. I have always used cast iron rings and never thought the teflon were worth using. Maybe I was wrong.

 

[64 TBOLT]

what convetrer you runnin??

 

[clevelandstyle]

Teflon rings
JPT .....517-663-0578

You can also get teflon rings at PA, but they are nearly twice the price as JPT.

 

[chipmechanic]

Ive got an Edge racing 9 1/2 inch converter . Stalled right at 4000 rpm. I'm going to send it in to them to get checked since it did spin on the hub. They may decide its OK or they may want to weld a new bub on it but I'd rather be sure.

Thanks on the teflon rings.

 

[chipmechanic]

I talked to the cconverter manufacturer today. His opinion was that I preloaded the converter under full load with the transbrake and released the throttle without letting the charge go through the transmission. The hydraulic pulse from the converter went back through the pump and broke the pump. He said to ALWAYS let the transbrake application go through the driveline even if its for 5 feet.

 

[64 TBOLT]

i found out why mine stopped workin tooooo

this is a edge too.First 5500rpm shift and this happpened.Put the stock one back in and everything is fine

<font size=-1>[ This Message was edited by: 64TBOLT2 on 3/28/06 3:00am ]</font>

 

[chipmechanic]

Unfortunately the stock converter won't live very long behind my 700+ HP 438 inch windsor and it certainly wont stall at 4000 rpm. In either case I'm certainly surprised that the converter faired as well as it did. The hub did not shear off and is probably reuseable with a little dressing up of the scoring from riding over the broken pump gear. I will be sending it back in for rehubbing but I cant fault edge for the converter causing the problem. It was my lack of knowledge of how to use a transmission brake properly.

 

[clevelandstyle]

I've released the throttle with the 'brake on lots of times. Never had a problem. Never heard that you shouldn't do it either. I'm a bit suspicious of that.

 

[gregaust]

The converter does engage deep enough in the gear?? I have seen one break the gear like that and was told the converter was pulled too far forward . Maybe??

 

[fairmont510]

I agree with clevelandstyle!If your converter looks like the one pictured,It dont look like it has anti ballooning plates.Does yours?Did your pump support look ate into?Maybe When you put the brake on and hit the gas, the converter ballooned,and shoved the inner gear into the support and broke the pump gear?

81 Fairmont Futura
510 in BBf C-4
ET [email protected] 113 1.26 60ft. 3060lbs, 1/8 mile

PS Until you put some passes on that trans the sealing rings wont see much wear.

 

[chipmechanic]

The pump support looks good. I do have anti balloon plates and there is nothing weird on the hub that looks like it is suspect or hitting the pump. I will check the engagement of the torque converter hub to the gear though and if need be I can machine the gasket surface to draw the pump further into the case to give the hub more room to move assuming adequate pump gear engagement and then adjust the thrust washers accordingly. It'll be thoroughly gone through . I just have a hard time seeing how the pump gear can shatter like that without either having hydraulically locked of having foreign matter through it.

 

[Stuarta]

The convertor is not seated deep enough.

You can add some flat washers between convertor and flex plate to push it in farther.