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Re: Hey.. everyone loves an engine failure mystery - Brand X [Re: dvw] #3065304
08/04/22 08:33 PM
08/04/22 08:33 PM
Joined: Jan 2003
Posts: 8,120
Detroit, MI
CokeBottleKid Offline OP
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Originally Posted by dvw
How do you know? If it has enough pump volume the pressure shouldn't suffer much. And then its usually at idle. That factory Ford crank probably looks like spaghetti noodle under heavy power. It been proven many times. Clearance is clearance. If there's lack of lube or flex, parts touch. Then the bad stuff starts. Open the clearance until they don't touch. Provide enough clean oil to keep them separated. That's the bottom line.
Doug


Heh there's a limit... I didn't bother checking that main clearance but it's gotta be huge... it vibrates horribly at 4k+... enough to warrant pulling the motor laugh

Re: Hey.. everyone loves an engine failure mystery - Brand X [Re: CokeBottleKid] #3065324
08/04/22 09:14 PM
08/04/22 09:14 PM
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Alberta
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440_Offroader Offline
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I wouldn't think your extra clearance on your #5 would cause a vibration. Your oil pressure should cushion that. Did your oil pressure change when the vibration start? All your bearings (even your rod bearings) looked scrubbed to some degree. I just took apart a 1976 440 that had original bearings in it. The 440 bearings looked better than any bearing in your pictures. Maybe a vibration damper failure? Lack of oil pressure? I agree with the larger clearances as well, unless your running 0W20 oil, in your non-performance engine. Just my twocents

Re: Hey.. everyone loves an engine failure mystery - Brand X [Re: 440_Offroader] #3065377
08/05/22 12:21 AM
08/05/22 12:21 AM
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Detroit, MI
CokeBottleKid Offline OP
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It's definitely the source of the vibration, and yes oil pressure dropped

Re: Hey.. everyone loves an engine failure mystery - Brand X [Re: CokeBottleKid] #3065393
08/05/22 08:03 AM
08/05/22 08:03 AM
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MI, usa
dvw Offline
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You added extra clearance. How did you do that? It's "huge" but you don't know what clearance it has? But you are sure it's your issue. You took the time to take it all apart. Then made a change and didn't measure anything? Crack check anything? Put it all back in the car. Uhmm.
Doug

Last edited by dvw; 08/05/22 08:11 AM.
Re: Hey.. everyone loves an engine failure mystery - Brand X [Re: dvw] #3065396
08/05/22 08:46 AM
08/05/22 08:46 AM
Joined: Jan 2003
Posts: 8,120
Detroit, MI
CokeBottleKid Offline OP
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I mean come on, you find a massive wiped number 5 main and you're not going to attribute it to a high RPM vibration?...

And actually yes I did mag the block and the crank, I found a good deal on a 331 stroker though so none of that is going back in the motor laugh

Re: Hey.. everyone loves an engine failure mystery - Brand X [Re: CokeBottleKid] #3065407
08/05/22 09:18 AM
08/05/22 09:18 AM
Joined: Oct 2003
Posts: 11,327
W. Kentucky
justinp61 Offline
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Originally Posted by CokeBottleKid
I mean come on, you find a massive wiped number 5 main and you're not going to attribute it to a high RPM vibration?...

And actually yes I did mag the block and the crank, I found a good deal on a 331 stroker though so none of that is going back in the motor laugh


Are you going to measure the clearances on this one? BTW, what bearing clearance does ford recommend?

Re: Hey.. everyone loves an engine failure mystery - Brand X [Re: justinp61] #3065490
08/05/22 02:12 PM
08/05/22 02:12 PM
Joined: Jan 2003
Posts: 8,120
Detroit, MI
CokeBottleKid Offline OP
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Originally Posted by justinp61
Originally Posted by CokeBottleKid
I mean come on, you find a massive wiped number 5 main and you're not going to attribute it to a high RPM vibration?...

And actually yes I did mag the block and the crank, I found a good deal on a 331 stroker though so none of that is going back in the motor laugh


Are you going to measure the clearances on this one? BTW, what bearing clearance does ford recommend?


Yes just like I did the last one.

Re: Hey.. everyone loves an engine failure mystery - Brand X [Re: CokeBottleKid] #3065511
08/05/22 03:25 PM
08/05/22 03:25 PM
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Posts: 124
Conroe , Texas
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iapco103 Offline
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Conroe , Texas
Is this car m/t or a/t? iapco103

Re: Hey.. everyone loves an engine failure mystery - Brand X [Re: iapco103] #3065553
08/05/22 06:23 PM
08/05/22 06:23 PM
Joined: Jan 2003
Posts: 8,120
Detroit, MI
CokeBottleKid Offline OP
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Originally Posted by iapco103
Is this car m/t or a/t? iapco103


manwell

Re: Hey.. everyone loves an engine failure mystery - Brand X [Re: CokeBottleKid] #3065623
08/05/22 09:16 PM
08/05/22 09:16 PM
Joined: Oct 2018
Posts: 124
Conroe , Texas
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iapco103 Offline
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Conroe , Texas
Originally Posted by CokeBottleKid
Originally Posted by iapco103
Is this car m/t or a/t? iapco103


manwell


These engines have several variations of flywheel , I suspect that the one you have is incompatible with your crankshaft and this is the source of the vibration and bearing wear.

Finding the correct one can trying at the very best. You will need a very patient FoMoCo parts man to help you.

Best of luck , iapco103

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