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Re: [GMCnet] Reviving the Cad 500 [message #163589 is a reply to message #163524] Mon, 19 March 2012 23:17 Go to previous messageGo to previous message
Adrien G. is currently offline  Adrien G.   United States
Messages: 474
Registered: May 2008
Location: Burns Flat, OK 73624
Karma:
Senior Member
>1. You want the radiator heat exchanger to be the last thing in the
hydraulic circuit before the fluid is returned to the transmission. If you
add an external fluid cooler (a really good idea), place it before the heat
exchanger so that the radiator heat exchanger has the "last word".

>2. Keep the restriction in any cooler low. Since a high volume of oil
flows in this circuit at times, you need low restriction to avoid having
pressure build up in the torque converter. That pressure buildup is bad for
a lot of things, including the engine's thrust bearing, the torque
converter, and the various bearings and washers in the transmission which
handle the axial thrust load. In a really bad case, excess converter
pressure can crack a transmission case.

>3. Do not block the hydraulic lines in any manner. This includes
thermostats and shutoff valves. Blocking the fluid flow not only results in
very high converter and line pressures, it also causes a lack of lubrication
inside the transmission which will quickly lead to transmission failure.

Ed,
I think that's a good point.

I wonder how much axial expansion a TC does per lbs of oil pressure. How much pressure would be required to balloon the TC?

If the TC has internal problems that normal internal pressures cause it to expand (balloon) picking up the axial free play plus (?). That could put pressure on the thrust bearing.

I wonder if oil pressure built up between the TC and the oil pump, may be thrusting the TC forward. Just thinking out loud.

If the thrust bearing is worn on the rear side (flex plate end side), I think it would make the TC a strong candidate to consider.

Ken,

I'm sorry to read that after all that work, it ended in a demoralizing disappointment. But from this challenge (and inputs), new knowledge will be gained for the good of our GMCMH interest.

IMHO, for what it's worth.



Adrien & Jenny Genesoto 75 Glenbrook (26-3) Mods LS3.70 FD / Reaction Sys / 80mm Front&Intermidiate / Hydroboost / 16" Tires / Frame Rebuild / Interior Rebuild Yuba City,Ca. Text 530-nine-3-three-3-nine-nine-6
 
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