94 E4OD head scratcher
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Joined: Jul 2002
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From: Bend,OR
94 E4OD head scratcher
1994 Ford Bronco 5.8/E4OD
gears, 35" tires , transgoshift kit installed setup by tranny shop
I had a motor rebuilt about 3yrs ago, balanced bottem end etc... motor ran great until this June when I lost the main bearings. the rod bearings where fine. I took the motor to a totally different machine shop and they checked everything out and scratched their heads as to what the cause was. they kept saying that the rod bearings should have also toasted given the extreme wear on the Crank Mains. the Thrust bearing was worn as well pretty heavy on both sides.
I have had a few people tell me that this damage may have been caused by my Torque converter swelling or possibly the pilot nose on the TC is to long and thus pushing excesivly on the crank.
now up till this point the tranny and motor both ran great. never slipping or anything.
Thoughts? going to drop motor back in and dont want it to fail again
gears, 35" tires , transgoshift kit installed setup by tranny shop
I had a motor rebuilt about 3yrs ago, balanced bottem end etc... motor ran great until this June when I lost the main bearings. the rod bearings where fine. I took the motor to a totally different machine shop and they checked everything out and scratched their heads as to what the cause was. they kept saying that the rod bearings should have also toasted given the extreme wear on the Crank Mains. the Thrust bearing was worn as well pretty heavy on both sides.
I have had a few people tell me that this damage may have been caused by my Torque converter swelling or possibly the pilot nose on the TC is to long and thus pushing excesivly on the crank.
now up till this point the tranny and motor both ran great. never slipping or anything.
Thoughts? going to drop motor back in and dont want it to fail again
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,704
Likes: 2,625
From: SE Florida
Do you have a stock flex plate? I've often wondered if a billet flex plate will cause this. Running higher than stock pressure to the converter will cause excessive swelling. If you have a modified valve body that raises the converter charge pressure over the stock 120 PSI you're going to have problems.
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Joined: Jul 2002
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From: Bend,OR
running stock flexplate, no visible crackes. I do have a transgo shiftkit installed, the tranny shop that did the install gave the valve body the lower setting as i didnt know what to expect.
this motor ran fine and hard for 3years almost to the month of original build. with shiftkit in the tranny this whole time.
this motor ran fine and hard for 3years almost to the month of original build. with shiftkit in the tranny this whole time.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,704
Likes: 2,625
From: SE Florida
I'm not talking about shift firmness settings. If someone did something wrong and changed the torque converter charge pressure you'd have a problem. But I would expect it to take a lot less than three years to develop.
Is there rust on the pilot on the front of the torque converter? How about in the hole that the pilot mates to in the end of the crankshaft?
It is also possible that the torque converter limit valve stuck and overpressurized the torque converter. A really good trans shiop should be able to tell if the torque converter has permanently ballooned.
Is there rust on the pilot on the front of the torque converter? How about in the hole that the pilot mates to in the end of the crankshaft?
It is also possible that the torque converter limit valve stuck and overpressurized the torque converter. A really good trans shiop should be able to tell if the torque converter has permanently ballooned.
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