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E4OD HUGE leak

5746 Views 8 Replies 6 Participants Last post by  Mr_Roboto
Was pulling an excavator back to rental place on Friday. Brother was driving my IDI and got about 20 minutes into the drive and noticed that temp guage was maxed out. Stopped for 5 minutes and decided to keep going because it was only approximatly 10 minutes to the place. I know this was not the best decision but he had to get back to work. I forgot about the above 3000 rpm pulling tip so that contributed to the overheat. QUESTION: is this normal? We were pulling about 6500 pounds very few, slight hills. Kept it mostly out of overdrive doing about 1800-2300 rpm. Does this indicate a bad thermostat or was it just the operator? It never overheated before(drove it home from 2 hours away) and cooled to lower half of temp. zone after trailer was off. Oh, the overdrive DOES work.

OK-now the bad problem. When we got to the rent place, I noticed a nice pool of some atf under the tranny. (funny- a newb there thought it was offroad diesel and got all worked up about it) It was leaking bad. Maybe a drip or more a second. half hour drive home it did fine and didnt even slip. Checked oil level and looked fine. Checked the next morning and still looked fine. Went on a hour long WVO run and leaked again. Got it home and up in the barn, took the plate thats on the front of the transmission off. That is where its leaking, the space where the engine goes to the torque convertor. Fearing a cracked TC but cant tell till I separate the tranny. I think the intense heat ruined something. IDEAS?

To clarify things, BASICALLY: the torque convertor acts as a flywheel and ATF pump, no? Pumps it to the valve body which actuates hydraulic pistons to move the planetary gear system. This is what i have gathered so far so correct me if im wrong.

All in all what are the possible problems with the transmission? Cracked lines, or TC?

Thanks~! /ubbthreads/images/graemlins/frown.gif
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Heres is my two cents... /ubbthreads/images/graemlins/grin.gif

First you have to remove the driveaxel (loosen two U bolts on the back axsel side of it and then pull it out of tranny...) then loosen the cross member in the rear of the tranny and then all (4 or 6 ) studs in the TC to free it from the flywheel. (Use a pry tool or a big flat screw driver and push the fly whel until you see the bolt, repeat that until you have taken them all off. (You have to bring down the TC too, coz aligning the TC with the gerator pump is close to hopeless when you put it back up...) Then you have to unhook the shifter asembly on the driver side of tranny (Be carefull with this when you lower the tranny, coz it is easy to bend this rods and get funny shifting afterwords...) and then disconnect the smal hoses for the cooler. (It sips oil out of it so considder yourself warned /ubbthreads/images/graemlins/laugh.gif ). It is rather easy to hook off all the electric wires so I recomend that you do that. You never know, maybe the tranny tips over or something like that and then, suddenly, you have a set of overstreched wires that may or may not work.... Unhook the manuel lever position sensor too, (MLPS), or you might end up doing the same thing as me when I crushed it and had to buy a new one. (Not that it matted, coz I would have done bought it anyway, but it is reather expensive so if you don't need to buy a new one...... /ubbthreads/images/graemlins/laugh.gif
And offcause you have to remove all the bolts in the bell housing and remove the govenor wire that sits close to the speedo wire at the tranny rear end...

I have done this 5 times by now and the first time I did it I even removed the exhaust pipes... and was forced to weld them back on afterwords!! (They where really stuck so I had to cut them off...)

I have had a major rebuild on the tranny just because it was sipping oil, just like your tranny, and I had changed every single oil seals in this tranny, but it still sips oil /ubbthreads/images/graemlins/confused.gif.... So I have started to suspect the inner gerator, or pump wheel, the end play was maybe a little to mush...... Time will show, when I bring it down again.... The weight on this thing is hardly anything /ubbthreads/images/graemlins/rolleyes.gif, I'll roughly guess it about 75 kilos.... So good luck to ya!!

Hope you find it! /ubbthreads/images/graemlins/laugh.gif

Best regards
Hans Petter
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