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Author
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Topic: Main bearing question
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afret
Gearhead Posts: 180
From: Lancaster, CA
Registered: Feb 2003
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posted 06-15-2003 03:00 PM
   
Pulled the 428 FE to check the bearings. #3 main bearing (Clevite) had worn to the backing and cut into the crank on the thrust surface toward the rear of the engine. Otherwise all the bearings looked reasonable. What could have caused this? It has a C6 with 5000 stall. Very few miles on the engine. Thanks for any ideas. I'm stumped.  Planning on trying FM bearings.
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clevelandstyle
Gearhead Posts: 1035
From: Connersville, IN
Registered: Jul 2001
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posted 06-15-2003 06:20 PM
My understanding is that the converter balloons and pushes forward on the crank which causes thrust wear.------------------
Ben
Grabber Green '70 Mach I 351C 4V
Robbin Egg Blue '79 Fairmont 351C 4V
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steve'66
Gearhead Posts: 8826
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 06-15-2003 11:59 PM
Yep,Ben's right the converter balloons and pushes the crank forward causing the wear on the thrust bearing. 99% of the time anyway.  SteveW
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afret
Gearhead Posts: 180
From: Lancaster, CA
Registered: Feb 2003
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posted 06-16-2003 12:33 AM
Thanks for the info. Does that mean the converter is defective?
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Fordwiser
Gearhead Posts: 390
From: Metamora, Illinois
Registered: Dec 2000
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posted 06-16-2003 11:44 PM
Did the converter have clearence when you first put it in? With the converter all the way into the tranny, should be 1/8 in. of clearence before you bolt it up, 3/16 max
Roger
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afret
Gearhead Posts: 180
From: Lancaster, CA
Registered: Feb 2003
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posted 06-17-2003 12:40 AM
I'm pretty sure it had a bit of clearance. We had just changed from a 10 inch converter recently and I recall the converter moving forward a bit when tightening the nuts on the studs. Don't recall if the 10 inch converter had fore/aft clearance though. The 10 inch converter always seemed really tight compared to the rated stall if that makes a difference. The trans and both converters were by A-1.
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Fordwiser
Gearhead Posts: 390
From: Metamora, Illinois
Registered: Dec 2000
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posted 06-17-2003 01:23 AM
Any signs of balloning of the converter, lumps, paint discolored, burnt fluid, did the stall change any over the time you were running it? Also check the hub where it goes into the tranny to see if it was grinding into the pump, if it was, could be metal floating around in your tranny.
Roger
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afret
Gearhead Posts: 180
From: Lancaster, CA
Registered: Feb 2003
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posted 06-17-2003 12:03 PM
Roger thanks for the tips on what to look for. Everything seemed ok. Hopefully there will be no problem with the 8 inch in there. Will get the crank fixed and put the 428 in storage and bolt in the spare 427 once the new FM bearings come in from Summit.  Thanks again.
Earl
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