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Re: thrust bearing issues
[Re: goldmember]
#1031924
07/13/11 02:43 PM
07/13/11 02:43 PM
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Joined: Aug 2003
Posts: 43,176
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,176
Bend,OR USA
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Quote:
Quote:
Their is only one thing that usually causes thrust bearings to die, that is pressure(forward or rearward thrust  )on the crankshaft  
Naa,there are other causes as well. I do agree that is a possibility however.At least the crank being pushed forward(never seen a crank sucked back,but I haven't seen everything). Did this block have aftermarket main caps installed?
Belt driven superchargers can cause a lot of problems when thier not installed correctly, not saying his is but they can and have cause lots of problems on crankshafts  Two different sets of main bearings with the same problem Time to find the cause All problems on cars are fixable, some are harder to diagnose than others
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: thrust bearing issues
[Re: Cab_Burge]
#1031927
07/13/11 02:56 PM
07/13/11 02:56 PM
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Joined: Feb 2004
Posts: 4,501
Gainesville,FL
goldmember
master
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master
Joined: Feb 2004
Posts: 4,501
Gainesville,FL
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Quote:
Quote:
Quote:
Their is only one thing that usually causes thrust bearings to die, that is pressure(forward or rearward thrust )on the crankshaft
Naa,there are other causes as well. I do agree that is a possibility however.At least the crank being pushed forward(never seen a crank sucked back,but I haven't seen everything). Did this block have aftermarket main caps installed?
Belt driven superchargers can cause a lot of problems when thier not installed correctly, not saying his is but they can and have cause lots of problems on crankshafts Two different sets of main bearings with the same problem Time to find the cause All problems on cars are fixable, some are harder to diagnose than others
Yep,I left out "the belt driven supercharger" as he doesn't have one. You are right that this problem needs to be found cause it would sure stink to do this over again.I had a mild 360 come through last year that was built by a local guy. The thrust bearing was trashed in less than 100 street miles,I could not believe what I found,but it was improper assembly that caused the problem.
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Re: thrust bearing issues
[Re: 526ciduster]
#1031928
07/13/11 02:59 PM
07/13/11 02:59 PM
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Joined: Feb 2004
Posts: 4,501
Gainesville,FL
goldmember
master
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master
Joined: Feb 2004
Posts: 4,501
Gainesville,FL
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Quote:
Make sure the converter is not hitting the crank bolts. You can have flexplate clearance and the converter will hit the bolts. 
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Re: thrust bearing issues
[Re: TheOtherDodge]
#1031929
07/13/11 03:33 PM
07/13/11 03:33 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Yes, second time this has happend, but the first time, we changed converters and dont know if the thrust problem was there at that time.
The converter turns freely when not bolted to the flex plate.
The block does have aftermarket billet caps.
Should have about 3/8" movement fore and aft on the
converter(not bolted up)... if not it cant grow
with the heat and torque which can cause ballooning
in the conv to allow it to move rearward
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Re: thrust bearing issues
[Re: 526ciduster]
#1031935
07/13/11 04:48 PM
07/13/11 04:48 PM
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Joined: Jan 2003
Posts: 25,796
Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,796
Rio Linda, CA
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Even if the converter is hitting the crank bolts or if there is a flexplate pull-up problem, this is local to the rear flange and shouldn't cause forward thrust on the thrust main.
The INTERNET, the MISinformation superhighway
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Re: thrust bearing issues
[Re: John_Kunkel]
#1031936
07/13/11 04:58 PM
07/13/11 04:58 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Even if the converter is hitting the crank bolts or if there is a flexplate pull-up problem, this is local to the rear flange and shouldn't cause forward thrust on the thrust main.
Only if the conv has enough room to grow and not bottom
out in the pump drive... other wise it bottoms in the
pump drive and then pushes forward on the crank
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Re: thrust bearing issues
[Re: TheOtherDodge]
#1031937
07/13/11 06:02 PM
07/13/11 06:02 PM
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Joined: Oct 2005
Posts: 976
ontario canada
mac56
super stock
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super stock
Joined: Oct 2005
Posts: 976
ontario canada
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Quote:
"Make sure the converter is not hitting the crank bolts. You can have flexplate clearance and the converter will hit the bolts."
How would the converter hit the crank bolts unless it is really balooning..or am I missing something?
I had one converter that had an anti balloon plate welded around the snout and it would hit the bolts before it closed the gap for the flex plate bolts so even though it looked like a gap it really was up tight.
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Re: thrust bearing issues
[Re: mac56]
#1031938
07/13/11 06:31 PM
07/13/11 06:31 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Quote:
"Make sure the converter is not hitting the crank bolts. You can have flexplate clearance and the converter will hit the bolts."
How would the converter hit the crank bolts unless it is really balooning..or am I missing something?
I had one converter that had an anti balloon plate welded around the snout and it would hit the bolts before it closed the gap for the flex plate bolts so even though it looked like a gap it really was up tight.
Even if the flex plate had some bind it wouldnt push
forward... it has to bottom out in the pump drive
to push the crank forward
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