Re: Thrust bearing/crank failure
[Re: 74RALLYE]
#1147989
01/01/12 11:51 AM
01/01/12 11:51 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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Can you see any protrusion that was cutting that groove
live every 24 hour block of time like it's your last day on earth
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Re: Thrust bearing/crank failure
[Re: JohnRR]
#1147999
01/02/12 09:18 PM
01/02/12 09:18 PM
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Joined: Sep 2004
Posts: 491
BLACKHEMIRR
mopar
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mopar
Joined: Sep 2004
Posts: 491
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A cast crank should definitely have the wide flange thrust bearing to reduce the wear on the crank. The '74 and later blocks used the larger thrust bearing, but it looks like you have the smaller bearing in your engine. It's VERY important that the thrust bearing main cap is aligned/set during assembly, too. Make sure you're good as far as a pilot bushing if you're going to put a 4 speed behind a cast crank.
Last edited by BLACKHEMIRR; 01/02/12 09:23 PM.
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Re: Thrust bearing/crank failure
[Re: 74RALLYE]
#1148001
01/02/12 10:20 PM
01/02/12 10:20 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:
Narrow flange bearing ate the wide flange crank! Now I've learned something new. Thanks! I wonder what the chances of this happening with the correct thrust bearing installed? The damage is on the rear thrust side. It was connected to an auto trans. The motor has 1,000 miles or less. I've never had it on the track, but I do like to accelerate at WOT when I have the space. The only questionable incident I can think of is when I hit a small patch of mud and lost traction. The replacement crank is steel.
There is only a few things that can cause that... lack of end play when it was assm, burr on the crank, or and most likely your converter is ballooned... if you measure the front and the rear sides of the thrust bearing you will get a idea of how much wear there is on the rear(within reason) but with all the wear being on the rear something was pushing the crank forward.. and that is usually the converter... when you un-bolted the converter how much did it slide rearward... I would still measure the converter to see where the snout is in relation to the pump hub
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Re: Thrust bearing/crank failure
[Re: MR_P_BODY]
#1148002
01/02/12 10:31 PM
01/02/12 10:31 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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Besides what the guys are saying about the wide vs narrow bearing I swear that in the first pic the left side has way more wear than the right side BUT that may be the pic or angle of the pic
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