5.0 rear main bearing... is it going out???

[SC74]

Son of a ***** that's a lot of work all for nothing!! I feel for ya man - I know that trans has only been in a short time too. As for help, no clue here. I don't see how the pump would make the noise you are describing, but I've been wrong before.

[Bronco Biff]

Third time tryint to post this!!!! Have you tried what Aisel suggested checking the crank for end thrust? Sounds like he might be on to something gained from experience especially with seeing the flex plate rubbing the spacer.

[chuzie]

Not completely. Pried it forward but not aft. I am out of time this trip so the Bronco will be living in SC for another month until I return on 14 January.

I plan on just replacing the thrust bearing if I do not see additional damage elsewhere. From my understanding, it should be a pretty quick and painless job once the oil pan is off as I can do it with the crank installed.

[chuzie]

Couldn't resist so I sneaked over to Chuck's during lunch to check the end play. I just had to know or I would have gone nuts over the next 4 weeks

I measured from the face of the flex plate. Tapped the balancer all the way aft, zeroed out the dial indicator, then pried the balancer forward. I ended up with .0125. I believe that is just out of limits but wonder if that is truly enough to be eating through the bearing and making such noise? I cranked it up and there was no sound until it warmed up and I punched the throttle; then it started the noise. I tried to see if moving the crank full forward or aft would change the sound. Each time, it took approximately 4 seconds after engine start for the sound to begin. I crawled under the oil pan with a stethoscope and spent a decent amount of time trying to locate the sound and I am confident it is most prevalent near the middle of the oil pan. That is the only area I can pick up the squeaking on the stethoscope although my ears tell me it seems to be originating from the flex plate area. I get no squeaking when I place the scope on the oil pan bolts near the rear main.

With the endplay out of limits and the apparent location of the sound, I am inclined to go with thrust bearing. I will pull the pan when I get back in town next month and replace it so stay tuned.


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[chuzie]

Need purchasing guidance for bearings.

Crankshaft undersize?
Groove location?
Groove style?
Bearing material?

Any suggestions?

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[blazinchuck]

stock 5.0 clevite 77

[chuzie]

Thanks bro. That is what Moody said too.

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