Ford E4OD in Pushing Fluid out when Hot

jd

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#1
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MAKE:Ford
MODEL:E350
YEAR:1993
MILES:81000
ENGINE:460 MPI
DESCRIBE ISSUE.... Owner removed driver side cylinder head to replace broken manifold bolts. Now notices engine temp gauge a little warmer than before...

....AND... Losing transmission fluid from the bellhousing area. This is after a trip, usually when backing into the driveway at home. This is a dual rear wheel E350 under a Class C motorhome, so it's always working hard dragging all that around.

I wonder if this E4OD has a Locking Torque Converter that isn't Locking. Does it have one? If so when does it Lock, and How do we tell? If not why not... How do we check it, fix it?

He usually tows a car with this rig, and normally does NOT use the OD function, so this is happening when the transmission's running in Third Gear.

THANKS!!!
 
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bp042665

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#2
ok first off yes it has a lock up converter and it applys after third gear depending on throttle and load on engine with the heat the pump expandes and the seal will leak also if the engine has over heated the transmission pump could've expanded enough to let the pump bushing move and cause this problem
 

jd

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#3
He isn't including overheat in the symptoms. Just higher in the gauge range. His apparently is marked N-O-R-M-A-L and was getting to "A". On our newer E-Series, that's about at the beginning of the Red part of the range under "H" for Hot.

He's added a Transmission Temperature gauge, connected at a service port he found, shows about 215/220F in OD and about 200 when not in OD.

What commands the Converter to Lock? From years back, there was a simple connector at the transmission, but I don't know where its Lock/Unlock orders came from.

Is there a way to test this locking converter function?
 

jd

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#4
THANKS!!! Just set this thread to "watch" and "send email" so can stay up on any help you can offer.
 

jd

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#5
Is there a way for the average home mechanical guy to check that the TC is locking when it should?
 

billr

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#6
Live-data is the easy way, but not so "easy" with OBD1. Maybe nickb2 can direct you to an ELM327 type of scan.

Use a tach to watch the engine rpm suddenly come down 500-1000 rpm as the vehicle speed and trans gear remain unchanged. Want to see if it is locking up fully? Find out your trans and final-drive (diff) ratios and calculate if the engine rpm matches a "lock" to the vehicle speed. Some TCCs have both PWM and "full on" modes, yours may not lock up fully at all times, or may not lock immediately.