Re: thrust bearing fail
[Re: Monte_Smith]
#1808350
04/21/15 03:16 AM
04/21/15 03:16 AM
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Joined: Nov 2004
Posts: 2,825 Sk. Canada
RemCharger
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master
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Posts: 2,825
Sk. Canada
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An automatic trans is ALWAYS trying to push the converter out the front, when the line pressure gets up, that's just a fact. Now, if you are pushing more fluid in the converter than it can exhaust, it will burn the thrust out of the motor. So what can cause that? If the converter has a sprag, it could be going out. Otherwise something in the trans is not allowing the converter to exhaust fluid properly.
Guys talk about "ballooning" all the time. You would need virtually zero snout clearance and an incredible amount of core expansion for that to actually hurt a thrust. Its normally always a fluid issue
Monte Doesn't it go from converter to cooler? ie; cooler's plugged? I always wondered what the symptons of a pinched line would be.
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Re: thrust bearing fail
[Re: 572charger]
#1808992
04/21/15 10:02 PM
04/21/15 10:02 PM
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Joined: Jan 2003
Posts: 4,270 Morrow, OH
markz528
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Morrow, OH
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Dealing with this issue in my cousin's 67 Firebird with a stroker 400. It now has wiped the thrust bearing twice. First time blamed the pressure in the tranny as the tranny had been rebuilt. This was a new build with the new stroker crank - old stock crank was fine.
In 125 street miles lost 0.010 inches in the thrust with the rebuilt motor. We are trying to cover all bases this time.
We want to know for sure if the tranny is causing excessive thrust on the crank so I believe we will measure the thrust force on the crank before we tear it apart. We have a plan...........
67 Coronet 500 9.610 @ 139.20 mph 67 Coronet 500 (street car) 14.82 @ 94 mph 69 GTX (clone) - build in progress......
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Re: thrust bearing fail
[Re: 572charger]
#1809212
04/22/15 07:44 AM
04/22/15 07:44 AM
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Joined: Mar 2003
Posts: 1,629 pa
572charger
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mark i know for a fact that a turbo 400 will wipe out the thrust bearing in the engine it is behind, if the convertor charger hole in the pump is not taken car of go to yellow bullet hutch trans section !!!!!
606 hemi pump gas best 9.60 at 142mph on motor 05 hemi daytona 1500 go-mango 4wd quadcab 2007 hotrod mag pump gas drags runner up, roadkill nights dodge big tire winner 2018 2019 back to back
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Re: thrust bearing fail
[Re: 572charger]
#1809215
04/22/15 07:54 AM
04/22/15 07:54 AM
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Joined: Mar 2003
Posts: 1,629 pa
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thanks for the input BOB i will check that before i reinstall it i sent it back to ati it hasn't been freshened since 2008 [i found paper work on it] cant hut to have it checked ?? its just weird that it happend so fast ?? one pass NO NO2 !! i noticed it lost about 20 psi of oil pressure so i put it on the trailer, took it apart 2 days later and i found metal in the oil pan only thing wrong was the back of the thrust bearing was destroyed all the other bearings were near perfect
606 hemi pump gas best 9.60 at 142mph on motor 05 hemi daytona 1500 go-mango 4wd quadcab 2007 hotrod mag pump gas drags runner up, roadkill nights dodge big tire winner 2018 2019 back to back
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Re: thrust bearing fail
[Re: 572charger]
#1809426
04/22/15 02:19 PM
04/22/15 02:19 PM
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Joined: Nov 2004
Posts: 6,890 North Alabama
Monte_Smith
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North Alabama
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Same crank, same trans, same converter that you have ALWAYS run, with no issues. So look at it logically. Did the converter to crank hub fitment suddenly change? Highly unlikely.......So what else was changed? You freshened motor and trans. So looking at it from that standpoint, you either set the thrust up WAY tight or something in the trans is not letting the converter exhaust the fluid fast enough............Or, like I said, the element in converter COULD be going away, but I am still betting something in trans. Ten year old converter though, so it sure wouldn't hurt to have it looked at and freshened
Monte
Last edited by Monte_Smith; 04/22/15 02:23 PM.
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Re: thrust bearing fail
[Re: 572charger]
#1809976
04/23/15 08:00 AM
04/23/15 08:00 AM
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Joined: Mar 2003
Posts: 1,629 pa
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yeah , monte im going to take the trans a apart , check my trans cooler and lines and i sent the convertor back to ati , i checked my my records the thrust was .006 , ill post back what i find !!!!
606 hemi pump gas best 9.60 at 142mph on motor 05 hemi daytona 1500 go-mango 4wd quadcab 2007 hotrod mag pump gas drags runner up, roadkill nights dodge big tire winner 2018 2019 back to back
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Re: thrust bearing fail
[Re: 572charger]
#1811197
04/24/15 10:06 PM
04/24/15 10:06 PM
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Joined: Jan 2003
Posts: 4,270 Morrow, OH
markz528
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Morrow, OH
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mark i know for a fact that a turbo 400 will wipe out the thrust bearing in the engine it is behind, if the convertor charger hole in the pump is not taken car of go to yellow bullet hutch trans section !!!!! Thanks! I did not know Yellow Bullet had a tranny forum. Did find some interesting info.
67 Coronet 500 9.610 @ 139.20 mph 67 Coronet 500 (street car) 14.82 @ 94 mph 69 GTX (clone) - build in progress......
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