Pressure vs thrust damage

[gnxtc2]

There has been some past talk of cooler line pressure or line pressure (I forget which) that destroys the thrust bearing in our motors.

Is there any way of testing the pressures? If so, where does the gauge tap into?

Billy T.
gnxtc2@aol.com

 

[Otto J]

test pressure in the cooler line

 

[gnxtc2]

Good.....come over and test it out for me :biggrin:

I was in CT this past Saturday, too bad you weren't around. I would've came over.

Billy T.
gnxtc2@aol.com

 

[Otto J]

has to be running first

 

[Otto J]

you plan on going to reynolds?

 

[J-B Racing]

Again

I changed the Main Bearing because of Thrust Wear 3 weeks ago. I checked the Crank end play today and it's starting again.
What the Hell is the solution to this nightmare that I didn't have a few years ago??

 

[wickedtt]

What converter are you using, I think the converter also will have something to do with this.

 

[SNOWBIRD]

What should cooler line pressure be on a 200 and what controls this preassure.....my main line pressure is 270 at wot and 90 at idle...can some coolers restrict pressure and cause a problem....will sitting at the line with a big turbo trying to build boost put more load on the trust...if you run .150 clearance between torque and flywheel will it eliminate ALMOST all chances of TRUST FAILURE anybody

 

[J-B Racing]

I don't think so. It's a problem that has started a few years ago after it's rebuild. I am using a 19930 AC with Front and back ballooning Plates. I even measured it for straightness before putting it back on.
I might think that the Boost valve may have something to do with it..
" Bigger Is Not Always Better"

 

[J-B Racing]

What should cooler line pressure be on a 200 and what controls this preassure.....my main line pressure is 270 at wot and 90 at idle...can some coolers restrict pressure and cause a problem....will sitting at the line with a big turbo trying to build boost put more load on the trust...if you run .150 clearance between torque and flywheel will it eliminate ALMOST all chances of TRUST FAILURE anybody

I think that trying to make more Oil Presure is not always a better way to go..

 

[SNOWBIRD]

I believe main line pressure and cooler line pressure have nothing to do with each other TRANS EXPERTS PLEASE

 

[bison]

With the converter unlocked the cooler line is a good indication of the pressure in the torque converter. Less than 50psi should be the goal. All could be good when hot but may be a problem when the oil is cold and on the t-brake.

 

[ijames]

Here's one old thread on this, for th400's: http://www.turbobuick.com/forums/tr...bearing.html?highlight=cooler+pressure+ijames, and an older one on the 200-4r's: http://www.turbobuick.com/forums/tr...l?highlight=transmission+cooler+line+pressure

 

[quickt]

With a 200 guys its not as simple a fix as a 400. Any of you guys using steel main caps?

 

[Alky V6]

TH-400s are more known for causing main thrust bearing damage. Even in OEM configurations. They are easily fixed by restricting the converter feed.

If a 200-4R is causing a thrust problem, it will be caused by a modification in the trans or possibly a restriction to cooler line flow. I have never seen an OEM 200-4R cause a main thrust problem.

The next question that needs to be asked is, if the trans being discussed is a 200-4R, what kind of mods have been done to it? In particular, the pump assembly.

 

[J-B Racing]

TH-400s are more known for causing main thrust bearing damage. Even in OEM configurations. They are easily fixed by restricting the converter feed.

If a 200-4R is causing a thrust problem, it will be caused by a modification in the trans or possibly a restriction to cooler line flow. I have never seen an OEM 200-4R cause a main thrust problem.

The next question that needs to be asked is, if the trans being discussed is a 200-4R, what kind of mods have been done to it? In particular, the pump
assembly.

Don..I cannot answer you on that as I am not the one who rebuilt it.
Lonnie...I do have steel Mani Caps. If that's what you are refering to..
Could the Pump be modified too much that's causing the Converter to push hard against the Crank with too much Oil Pressure?

 

[quickt]

Don..I cannot answer you on that as I am not the one who rebuilt it.
Lonnie...I do have steel Mani Caps. If that's what you are refering to..
Could the Pump be modified too much that's causing the Converter to push hard against the Crank with too much Oil Pressure?

I have never seen a 200 cause a thrust problem problem unless you have a cooler restriction or something odd like that. I have see it once with a JW wheel and vigilante Converter where the bolts hit the back of the converter. I have seen many steel cap engines have thrust issues. If there is enough pump pressure causing hi converter charge I guess it could cause it but I would not think so.

 

[J-B Racing]

I have never seen a 200 cause a thrust problem problem unless you have a cooler restriction or something odd like that. I have see it once with a JW wheel and vigilante Converter where the bolts hit the back of the converter. I have seen many steel cap engines have thrust issues. If there is enough pump pressure causing hi converter charge I guess it could cause it but I would not think so.

How do you increase Pressure in the 200's...Bigger Boost Valves!!
I have been running this car for over 15 years and this has started last year. Mind you that my Transmission has been rebuilt about 4 times within the years. So some kind of new mods have been made to cause this, and I will have to find out from the Tranny Builder.

 

[quickt]

PR spring is main pressure increase and Boost valve. If you have had steel caps for that long I would say you might be on to something. Also look at the stator shaft to make sure there is no wear that can hang the converter up sometimes and might cause it.

 

[J-B Racing]

PR spring is main pressure increase and Boost valve. If you have had steel caps for that long I would say you might be on to something. Also look at the stator shaft to make sure there is no wear that can hang the converter up sometimes and might cause it.

OK Budd..
Thanks