Pressure comes from inside the trans, Right. Nothing holds the converter sealed to the trans(input/pump shaft) except the flexplate. If you applied 200psi (or whatever the converter actually sees) with the trans sitting on a bench the converter would blow off. There is a lot of surface area on the backside of the converter, it makes sense to me that the back cover would bow out some, since pressure is equal in all directions. Thats JMHO.
Contact between crank bolts and torque converter
- Thread starter ZR1160
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That's at 100psi. What is the apply pressure for the TC clutch? 2-3x that?
If you bolt up the trans and TC, then remove it without ever running the engine, will the marks be there?
I don't think the TC cover bows. I was thinking that the flex plate would slightly bend around the perimeter, with the center staying put because of the crank. It only has to move what, like 1/8"?
One thing that is wrong with Ben's drawing is that the little men (hydraulic pressure) are actually pressing against the inside of the trans out to the TC clutch. The pressure isn't contained to the inside of the TC.
Is that not what I just said?
The flexplate is there to absorb the impact of TCC apply. The cover bows out as well, although it is not the sole source of the problem. So it is a combo of both the flexplate giving in and the cover pushing out.
Fluid flows from the pump to the TC, so pressure is not contained in the TC, that is why it will pop off with out something else holding it in. (the flexplate in this case).
I would think 100psi would be more than enough to pop the TC off.
At work we were using the tail stock of a flat bed lathe to hold an end cap on a vessel we were pressure testing, 60 psi of air pressure blew a 200 pound tail stock 30 ft. The tailstock was clamped to the bed ways with three 1 inch bolts. So it doesnt take much to do some serious damage. Needless to say that tail stock is scrap now and we have built a camber with heavy welded I beam frame to test with now.
At work we were using the tail stock of a flat bed lathe to hold an end cap on a vessel we were pressure testing, 60 psi of air pressure blew a 200 pound tail stock 30 ft. The tailstock was clamped to the bed ways with three 1 inch bolts. So it doesnt take much to do some serious damage. Needless to say that tail stock is scrap now and we have built a camber with heavy welded I beam frame to test with now.
I test transmissions on the bench with the converter installed and move gear shift lever to test different components for leaks. Converter itself does not see full mainline.
Another test we do is disconnect converter from flex plate and start engine to check for noise. Never had a converter move. Try it yourself.
Another test we do is disconnect converter from flex plate and start engine to check for noise. Never had a converter move. Try it yourself.
Yes they will. The converter rebuilder is just using up all the space he can for the converter. Nothing wrong with crank bolts touching converter.
As far as blowing air into converter or pressure; only the converter clutch piston is sealed. The rest of the converter is not. No way can you blow the converter off the trans.