Re: cause for thrust bearing failure? 440
[Re: aspenrt360]
#1447334
06/04/13 08:12 AM
06/04/13 08:12 AM
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Joined: May 2004
Posts: 12,383 Taxes & Virus's R-US, NY
Dragula
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Quote:
hmm the converter does have fairly thick pads on it i have not really looked at it to hard yet as i have been tearing down the engine and getting it to my machinist to have it speced out. so if the pads are to thick it does what? pushes the converter forward?
Not saying that is your cause, but if the pads are too thick, it pushes on eveything. It will push the back of the crank and you will loose one side of the thrust...Take a look and see what it looks like. Post a pic if you can.
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Re: cause for thrust bearing failure? 440
[Re: aspenrt360]
#1447335
06/04/13 10:17 AM
06/04/13 10:17 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
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Romeo MI
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If you have good torque and the conv doesnt have balloning plates the conv will grow and push on the pump and forward on the crank... weak leak is the thrust bearing.. as said if it didnt have some play to the flex plate it will eat the bearing
Last edited by MR_P_BODY; 06/04/13 10:18 AM.
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Re: cause for thrust bearing failure? 440
[Re: aspenrt360]
#1447339
06/04/13 02:48 PM
06/04/13 02:48 PM
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Joined: Jan 2003
Posts: 25,747 Rio Linda, CA
John_Kunkel
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In some rare cases the reaction shaft spins in the pump support and sends full line pressure to the converter instaed of a lower regulated pressure. This keeps a constant forward pressure of several hundred pounds on the crank.
The INTERNET, the MISinformation superhighway
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Re: cause for thrust bearing failure? 440
[Re: dmking]
#1447342
06/05/13 09:24 AM
06/05/13 09:24 AM
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Joined: Jan 2003
Posts: 13,354 Marion, South Carolina [><]
an8sec70cuda
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I've seen an externally balanced 440 w/ an internally balanced flexplate eat up thrust bearings. Changed the plate and no more problems.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: cause for thrust bearing failure? 440
[Re: dmking]
#1447344
06/07/13 01:57 PM
06/07/13 01:57 PM
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Joined: Jan 2003
Posts: 74,974 U.S.S.A.
JohnRR
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Quote:
i also seen a block that had the mains line honed and the caps were not cut on a 90. loosen the cap and good end play. torque it down and it gets tight.
I had a similar problem after a linebore only it locked the crank solid when the #3 was torqued down.
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Re: cause for thrust bearing failure? 440
[Re: blue_stocker]
#1447346
06/07/13 02:20 PM
06/07/13 02:20 PM
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Joined: Jan 2003
Posts: 74,974 U.S.S.A.
JohnRR
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Quote:
I had one 440 that had a constant thrust-destroying problem in my stocker when I was running it in a stick-shift class. I never did find what was causing that dilemma?!
Could it have been the constant pushing of the clutch pedal ?
I'm adding a oil channel in the #3 bearing on my latest builds , going in stick cars, to help put more oil between the crank and the bearing.
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Re: cause for thrust bearing failure? 440
[Re: aspenrt360]
#1447347
06/07/13 03:02 PM
06/07/13 03:02 PM
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Joined: Nov 2003
Posts: 2,715 closer to Canadian beer!
torkrules
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Quote:
so we are getting the crank fixed right now the thrust bearing failed big time! i have never even heard this engine run but it seems to have been put together ok. i am having the block tanked to get all the oil passages cleaned out then new bearings throughout. we will give it a hone and a fresh set of rings while we are at it. it only had 4000 miles when it lost the thrust bearing. the converter looks fine but i am worried about the trans i don't know much about it and i am concerned it may have had something to do with the bearing issue.what could be some of the possible causes and what can i look for? thanks guy's
Typical candidates are:
Rough on the thrust face of the crank. When the crank is machined it leaves "star burst" lines radiating outward. Very difficult to polish
Ballooning torque converter from excessive pressure in the converter
Lack of play between flex plate and converter
Excessive clutch pressure (4 speeds). The heavier the clutch, the more pressure needs to be exerted to release it. This force pushes the crank forward against the rear thrust surface. I try not to start my car with my foot on the clutch because there is 0 oil pressure. I also try to shift to neutral and have my foot off the clutch at stop lights.
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Re: cause for thrust bearing failure? 440
[Re: BIGSPEED]
#1447349
06/10/13 10:18 AM
06/10/13 10:18 AM
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Joined: Jan 2003
Posts: 74,974 U.S.S.A.
JohnRR
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Quote:
99 and 1/2 percent of thrust bearing failures are related to the convertor,trans,trans cooler ,flexplate etc.NOT THE ENGINE BUILDER,HAVE YOU EVER SEEN A THRUST WEAR OUT ON THE FRONT SIDE?43 years in the engine building business never seen one thrust failure on the front side!Bill C.
I don't think he was talking about the PROFESSIONAL engine builder
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