I know a guy that used to build th400's for me, he always dilled and tapped an 1/8" pipe plug into the edge of the converter. I never had any problems and when changing the fluid and filter you could get all 10 quarts.murrsue said:I was going to take a torque converter in to the tranny shop to flush it. It has no drain plug. I've heard of people drilling a drain hole and tapping it and installing a plug. Is this possible? Where to drill? What size plug? (It's a 700r4)
you would need to drill into the converter a couple of inches to hit the stator. You would damage the turbine and fins first.cucumber1949 said:Yeah, you can drill a hole in the converter and reseal it with a closed-end pop rivet and some gasket sealer. You run the risk of damaging a stator if you don't drill in the right place. Instead of draining the converter, you can do a complete flush via the cooler lines without removing the converter.
I was just thinking about the same thing. ~25 years ago, I rebuilt trannys for a living at double-A-beep-beep, and it was standard practice to drill, tap, flush and install an 1/8" pipe plug afterwards. The shop I worked at had no "flushing machine", but we'd pump solvent through them and spin the turbine with an input shaft. Probably did several hundred that way and never had a balance problem, but to be honest, I was never really fond of that method. Balance questions still remain in the back of my mind. I don't do that for a living any more, but still rebuild one every now and then for family and friends.Crosley said:you would need to drill into the converter a couple of inches to hit the stator. You would damage the turbine and fins first.
the 700 converter or any lock up style converter can not be drilled on the front ( fly wheel side) since the converter clutch apply area is there at the outer edge of the shell
Chazmac,Chazmac said:Flushing a converter is so arcane I cannot come up with a proper analogy.
Converters with lockup clutches (TCC) have so much more mechanical parts in them than does an older non lockup style converter. Trans failure = converter REBUILD !
How many of you drain out old oil from an oil filter and reuse it?? Do you flush oil filters??
Converters trap trans debris. Period. Fresh trans fluid, especially hot, is one of the best solvents available to clean trans parts, including the converter AND cooler. Moreover, the TCC clutch will be impregnated with debris, there will be a worn lining, collapsed orings or seals and worn, overheated or failed thrust washers. How are you going to clean the roller clutch in the stator assembly? Fears of imbalance are minimized by the potential trans woes introduced by re-using an old converter. Seems to me that UPS and FedEx can get anywhere in this country and the coasts are only 5 days apart, at worst. Shipping is no excuse. Quality rebuilt converters are affordable and the only choice for anyone who cares about finishing a rebuilding effort correctly.
Also, if you have that many destroyed hard parts, (4T60E) dispose of the trans cooler and install a new one.