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David Claflin
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« on: December 24, 2006, 03:01:27 PM » |
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If an American is to amount to anything he must rely upon himself, and not upon the State; he must take pride in his work, instead of sitting idle to envy the luck of others. He must face life with resolute courage, win victory if he can, and accept defeat if he must, without seeking to place on his fellow man a responsibility which isn't theirs-TR
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sobots
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« Reply #1 on: December 24, 2006, 05:01:32 PM » |
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Man, that really sucks!  At least you know what the knocking was. Merry Christmas?  |
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I believe that if life gives you lemons, you should make lemonade. Then find someone who's life is giving them Vodka.....and have a party.
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David Claflin
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« Reply #2 on: December 26, 2006, 06:22:03 AM » |
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This doesn't look right to me, why would one bearing half be almost wiped completely out and the other side be barely touched!??! Is the crank warped/bent?  |
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If an American is to amount to anything he must rely upon himself, and not upon the State; he must take pride in his work, instead of sitting idle to envy the luck of others. He must face life with resolute courage, win victory if he can, and accept defeat if he must, without seeking to place on his fellow man a responsibility which isn't theirs-TR
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J. D.
Badass Supporter
Badass Member
Posts: 6774
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« Reply #3 on: December 26, 2006, 07:01:05 AM » |
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If I had to guess, maybe it's the pressure the rod put on one side vs the other side.
The rod is pretty much riding along on the good looking half until the engine fires, I'm guessing the good looking half is the outside or bottom bearing? Then after combuston it is being forced with great pressure on the other bearing on the down stroke. More wear there, assuming the bad bearing is the top or inside bearing.
But in reality, I really don't have a clue.
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David Claflin
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« Reply #4 on: December 26, 2006, 07:36:41 AM » |
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Oops, forgot to specify, the bad part was on the bottom, or the good part was in the block.
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If an American is to amount to anything he must rely upon himself, and not upon the State; he must take pride in his work, instead of sitting idle to envy the luck of others. He must face life with resolute courage, win victory if he can, and accept defeat if he must, without seeking to place on his fellow man a responsibility which isn't theirs-TR
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NUTTSGT
The official
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Posts: 10029
Vehicle: 1986 Ford Mustang GT
Sulphur Springs, Ohio
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« Reply #5 on: December 30, 2006, 06:11:43 PM » |
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I wouldn't have primed it til right before I was to start it.
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Don't race it if you're afraid to break it.
My wife is a Dispatcher, she tells me where to go .....and gets paid for it.
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David Claflin
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« Reply #6 on: December 31, 2006, 06:57:20 AM » |
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I wouldn't have primed it til right before I was to start it. Ideally I should have primed it again right before I started it like I did yesterday when I put the old engine back in.  I've always primed the engine on the stand, just to give myself a warm fuzzy I guess that everything is working like it should. With the problems that other engine had it wouldn't have mattered how many times I primed it. |
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If an American is to amount to anything he must rely upon himself, and not upon the State; he must take pride in his work, instead of sitting idle to envy the luck of others. He must face life with resolute courage, win victory if he can, and accept defeat if he must, without seeking to place on his fellow man a responsibility which isn't theirs-TR
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David Claflin
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« Reply #7 on: January 09, 2007, 10:48:43 AM » |
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I just spoke with the machine shop guy. He said the crank bore align specs are good so it wasn't a matter of studs being in there. THe big ends of the rods are all good so they really don't know what caused it, there is another shop looking at the crank and he hasn't heard back from them yet but should hear from them today. He said one old mechanic came in and asked if the motor had any detonation issues at all. I said it hadn't and if it was detonation why would it be just three rod bearings and one main? I still think there i something up with the crank as it wasn't even contacting the one half of the main bearing yet wiped out the other side of the bearing half as seen in the pictures. I'll post up more when I get more info.
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If an American is to amount to anything he must rely upon himself, and not upon the State; he must take pride in his work, instead of sitting idle to envy the luck of others. He must face life with resolute courage, win victory if he can, and accept defeat if he must, without seeking to place on his fellow man a responsibility which isn't theirs-TR
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quake101
Webmaster
Administrator
Badass Member
Posts: 5110
Vehicle: 1990 Ford Mustang GT
Ohio
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« Reply #8 on: January 09, 2007, 01:58:57 PM » |
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Wow, This is very odd. I want to know what the hell happen.... |
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679506stangs
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« Reply #9 on: January 10, 2007, 10:21:20 PM » |
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It SOUNDS like a bent crank.....  That sucks |
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90LX
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« Reply #10 on: January 11, 2007, 12:48:29 PM » |
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I think the damage started with the center main bearing, and debris was carried with the oil to the rod bearings. The rod bearings were probably fine, but became innocent victems.
Possible causes could be:
Debris under the main bearing shell.
Something preventing the bearing shell from fully seating.
Bent crank. (Possibly. Would think if bent it would wear both shells.)
Poor main bore alignments.
Is another shop verifying the bore alignment?
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90LX
13.87 @ 98
S/C 2327
7.89 @ 168
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David Claflin
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« Reply #11 on: January 12, 2007, 03:56:13 AM » |
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It's back at the shop, they said bore alignment was good. I was very careful about keeping things clean, even when I took it apart I found nothing out of the ordinary aside from the obvious damage and metal debris. The back of the shell had no damage indicating something was there.
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If an American is to amount to anything he must rely upon himself, and not upon the State; he must take pride in his work, instead of sitting idle to envy the luck of others. He must face life with resolute courage, win victory if he can, and accept defeat if he must, without seeking to place on his fellow man a responsibility which isn't theirs-TR
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90LX
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« Reply #12 on: January 12, 2007, 08:59:14 AM » |
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If no debris or anything else was keeping the bearing from registering properly, I think something else is up with the bearing or the cap. Are both bearing shells correct for the same size main journal? A wrong bearing half (under ground sized) packaged with the wrong kit (standard size) has happened before. We always check the bearing shell sizing on the back of all shells to make sure. Did you measure all the main bearing clearances during assembly? It definately looks like it was tight on the bearing cap half. Failure diagnosis can be very intriguing after the initial  subsides. |
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90LX
13.87 @ 98
S/C 2327
7.89 @ 168
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David Claflin
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« Reply #13 on: January 12, 2007, 07:14:12 PM » |
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The machine shop has everything now, so am waiting on word back from them.
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If an American is to amount to anything he must rely upon himself, and not upon the State; he must take pride in his work, instead of sitting idle to envy the luck of others. He must face life with resolute courage, win victory if he can, and accept defeat if he must, without seeking to place on his fellow man a responsibility which isn't theirs-TR
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Ralph
Supreme Regulator
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Posts: 14444
Vehicle: 2002 BMW 3 Series
DOT's my b****
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« Reply #14 on: April 26, 2007, 02:24:10 PM » |
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Thrust washer failure? That took out my buddy's 5.4 in a very similar manner.
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David Claflin
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« Reply #15 on: April 27, 2007, 12:28:59 PM » |
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Thrust washer!??!
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If an American is to amount to anything he must rely upon himself, and not upon the State; he must take pride in his work, instead of sitting idle to envy the luck of others. He must face life with resolute courage, win victory if he can, and accept defeat if he must, without seeking to place on his fellow man a responsibility which isn't theirs-TR
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Ralph
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Posts: 14444
Vehicle: 2002 BMW 3 Series
DOT's my b****
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« Reply #16 on: April 27, 2007, 12:40:57 PM » |
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Yeah, in front of the first main bearing, or behind the rear main I can't remember which. Keeps the crank from walking.
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Dave88LX
It's all Nuts and Bolts
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Posts: 9553
Vehicle: 1997 Pontiac Firebird
Crush the Chargers.
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« Reply #17 on: April 27, 2007, 02:52:55 PM » |
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It's not a thrust washer, rather a thrust bearing. I have Ford and SBC mixed up right now, I can't remember if it's 3 or 5, but that's the one tha keeps the crank from moving front-to-back. I think the measurement is supposed to be in the ~.007" range, but check a book/source to make sure of that. I had a little over 55 PSI on the gauge I hooked up on the stand. I did not prime it again before I started it the next day, should I have?? In my opinion and others when I had the same question, no. You primed it while cranking the engine over, ensuring that you had oil running completely through the block. I assume you had the valve covers off, and watched for oil to come out of each pushrod? Reason I say no is because if you let your car sit for a day, you don't prime it before you start it again do you? What about after it sits for a week? Nope.  Also I torqued the rod bolts to 40 ft. pounds, with 3/8 ARP bolts should I have gone more?? If you need a closer look at something let me know. What did the ARP box/package say to torque them to? How many TIMES did you go through the torque sequence on them (to polish the threads to get an ACCURATE reading)? IIRC, ARP reccomends torquing them 3-5 times, 5th or so being the final torquing. JMO.  |
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David Claflin
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« Reply #18 on: April 27, 2007, 08:43:35 PM » |
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They never fessed up to screwing something up but they cleaned the whole block, vatted all the internals pieces, put screw in plugs in the oil galleyand reground the crank. They only charged me for regrinding the crank. I think there was nothing wrong with the oiling system, but instead something was wrong with one of the bearings I got from him.
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If an American is to amount to anything he must rely upon himself, and not upon the State; he must take pride in his work, instead of sitting idle to envy the luck of others. He must face life with resolute courage, win victory if he can, and accept defeat if he must, without seeking to place on his fellow man a responsibility which isn't theirs-TR
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Ralph
Supreme Regulator
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Posts: 14444
Vehicle: 2002 BMW 3 Series
DOT's my b****
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« Reply #19 on: April 29, 2007, 08:17:38 PM » |
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What Dave said, I got myself thinking Mod motors, sorry David.
The #3 main bearing, you know how it's flanged on both sides? That's to prevent the crank from walking forward and backward. I think the max travel is .008", much more than that and it will eat bearings.
A local guy had a 347 that chewed bearings up like crazy due to the lands on the crank where that 'thrust' feature is being worn from a previous meltdown. If they reground the crank at some point they may have touched that land feature up and it may be walking too far.
I have no idea if there's an over-width flange bearing available (like an undersize journal type) that would control that.
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David Claflin
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« Reply #20 on: April 30, 2007, 08:03:53 AM » |
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It's good now, been running fine for 3 months now. The crank before had been polished not ground.
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If an American is to amount to anything he must rely upon himself, and not upon the State; he must take pride in his work, instead of sitting idle to envy the luck of others. He must face life with resolute courage, win victory if he can, and accept defeat if he must, without seeking to place on his fellow man a responsibility which isn't theirs-TR
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