Thrust Bearing Failure
#1684390
10/11/14 12:01 AM
10/11/14 12:01 AM
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Joined: Mar 2008
Posts: 57 florida,usa
rdakota340
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Posts: 57
florida,usa
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I could not find my old post. So anyway built motor it ate the thrust bearing with in 300 miles and the crank was junk.I had done some checking found out that the -6 fitting I used was restricting the cooler flow and pushing the converter forward so took the tranny apart and drilled the cooler circuit out to 1/4"NPT to -8 line thought that was fix turns out it didn't. Bought new crank "Scat" got motor back in drove it 100 miles check the end play it has.037 so it too is wearing the bearing again, Well I finally talk to someone the builds a lot of trannys and big block mopars. He ask for all my clearances and when I told him I had 1/8" between converter and flex plate he said that's my problem he has always had 3/16" to a 1/4". I told him my input endplay was .012" he said that too is a problem I need more and yes I looked it up and there should be .036" to .084". I'm working on checking to see if the crank is ok tomorrow if so then I hope to have it running in two weeks so we shall see!
Turbos The Only Power Adder!
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Re: Thrust Bearing Failure
[Re: rdakota340]
#1684394
10/11/14 07:22 PM
10/11/14 07:22 PM
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Joined: Mar 2008
Posts: 57 florida,usa
rdakota340
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Can scat crank be welded up on the thrust surface.
Turbos The Only Power Adder!
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Re: Thrust Bearing Failure
[Re: rdakota340]
#1684399
10/15/14 10:38 PM
10/15/14 10:38 PM
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Joined: Mar 2008
Posts: 57 florida,usa
rdakota340
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Did some checking and found the pilot snout on the converter is bottoming out before the pads touch the flex, So is this my problem?
Turbos The Only Power Adder!
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Re: Thrust Bearing Failure
[Re: rdakota340]
#1684401
10/15/14 11:28 PM
10/15/14 11:28 PM
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Joined: Apr 2007
Posts: 289 Lowes
steve660
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Lowes
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Had same problem. Converter hub was bottoming/ballooning out on crank. I put .025 shim between crank and flexplate and .025 shims between flexplate pads and converter. You want as much clearance as possible between converter hub and the crank. With engine out of the car I bolted the converter up with flexplate on and used clay to determine clearance between converter hub and the crank. You could also use a small wad of aluminum foil to determine clearance. Without the shims it had ZERO clearance. Solved my problem...hope this helps..
PSO headed 632 from MM. Cracked cylinder, loose valve seats, low oil pressure, low cylinder pressure. ..... Now its a door stop....
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Re: Thrust Bearing Failure
[Re: rdakota340]
#1684403
10/15/14 11:42 PM
10/15/14 11:42 PM
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Joined: Apr 2007
Posts: 289 Lowes
steve660
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That should help. While my crank was out i had in machined for more clearance for the converter hub, but it still bottomed out. Sometimes aftermarket cranks and converters don't fit together right. I always check the clearance if im trying a a diff converter. Tearing out thrust bearings SUX!!!
PSO headed 632 from MM. Cracked cylinder, loose valve seats, low oil pressure, low cylinder pressure. ..... Now its a door stop....
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Re: Thrust Bearing Failure
[Re: rdakota340]
#1684405
10/16/14 08:48 PM
10/16/14 08:48 PM
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Joined: Mar 2008
Posts: 57 florida,usa
rdakota340
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Did some checking today and found that there is a .40''gap between converter pads and flex plate so the snout needs to be cut down .100 to get my clearance and hope this fixes it.
Turbos The Only Power Adder!
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