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New weird problem HELP!!!
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Knarley Darley
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PostPosted: Fri Feb 15, 2013 11:05 pm    Post subject: New weird problem HELP!!! Reply with quote

2010 Ford Ranger. Customer runs it low on oil, and fries the rod bearings with 68,000 miles on it, I find the exact day, month and year (produced on the same day as the original engine) used replacement with 15,000 original miles, goes in smooth, runs great, 200 miles later the flex plate breaks in a perfect circle around the crank bolts. No noise or warning of any kind. Took the original flex plate from the blown up engine, checked all the bell housing, and flange surfaces, oil pan alignment, dowel pins, pump bushing, and torque converter, and everything looks fine. Put it back together with the original flex plate, and 197 miles later it did the same thing cruising on the freeway both times. Any ideas?
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Sat Feb 16, 2013 12:14 am    Post subject: Reply with quote

did you look close at the end of the crank ? possible its machined weird and the converter doesnt go all the way in ? have you tried slipping the converter into the end of the crank to verify that it will seat fully against the flexplate (just converter without trans) ?
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squeeezer
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PostPosted: Sat Feb 16, 2013 12:34 am    Post subject: Reply with quote

That converter has studs on it right????
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clay
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1972 Chevrolet Nova

PostPosted: Sat Feb 16, 2013 1:44 am    Post subject: Reply with quote

Strange stuff is finding you lately! I would think it has to be flexing to crack it like you describe. Even with the scenario like 10sec.et is talking about (which is a definate possibility) it still wouldn't flex it back and forth. I don't really know how to check to see if the converter mounting face is parallel because even it you loosen it and see how it looks compared to the flexplate most flexplates I've seen wobble if they aren't bolted to the converter. Only way to know for sure is to mount an indicator on the transmission input shaft and sweep the crank center diameter and then sweep the face where the flexplate meets to see what's up. That sucks though - it shouldn't be that hard. Doing some quick looking on the net that problem does show up and there is talk about a tsb on it but nothing concrete on the solution or cause. Clay
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Knarley Darley
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PostPosted: Sat Feb 16, 2013 2:05 am    Post subject: Reply with quote

Converter does have 4 studs, went in nice, and was not jammed against the flex plate, also didnt have to pull the studs through with the nuts either. The converter slid right up tight against the flex plate by hand, no problem. I don't have the trans back out yet, but I am going to check converter in flex plate, and pilot of crank, no trans. Thanks- all good points. I will keep you posted.
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89Gmcsierra
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PostPosted: Sat Feb 16, 2013 7:54 am    Post subject: Reply with quote

I know with small blocks if u go from a manual to an automatic you have to remove the pilot bearing or it wont seat the convertor in the crank correctly.
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Paul P
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1971 Chevrolet Chevelle

PostPosted: Sat Feb 16, 2013 9:40 am    Post subject: Reply with quote

That's a strange one. How is the bearing in the pump of the trans any play there? Crank end play? The rest of the things posted are right on the money for things to check. Hope it shows itself soon.
Paul

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Knarley Darley
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PostPosted: Sat Feb 16, 2013 11:42 am    Post subject: Reply with quote

I plan on checking end play in the replacement engine. I took the pan and mains off the old eng., and the thrust was fine. The mains didn't even look that bad, other than some trash that transferred from the rods.
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Paul P
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PostPosted: Sat Feb 16, 2013 12:44 pm    Post subject: Reply with quote

I am assuming that it was up against an automatic also right? I assume this because you have eaten 2 flywheels...
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2001 Focus 2.0 Zetec
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1971 - Chevelle 408 SBC N.A.
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Knarley Darley
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PostPosted: Sat Feb 16, 2013 10:05 pm    Post subject: Reply with quote

They were both automatics, and neither had a pilot bushing, or bearing. The more I have digested everything that has been suggested I think the problem is the trans bushing in the pump, or the converter internals. I think the converter is hanging off the flexplate with full weight, and not enough support from the trans end is causing it to be constantly flexing. I just don't know what else could cause it to break that fast, and really clean break too. I ordered a new one from Ford, and I will be curious to see if it is a heavier duty unit, or out of the same thin material.
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Sat Feb 16, 2013 10:09 pm    Post subject: Reply with quote

it is a used engine. possible it was from a vehicle that got rearended hard enough to shove everything forward and bend the flange on the crank ? i know its a stretch but, might be worth setting up a dial indicator and turning the engine by hand just to be sure.
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af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

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Knarley Darley
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PostPosted: Sun Feb 17, 2013 12:12 am    Post subject: Reply with quote

Good call, That is a definite possibility, and that would break the thing fast.
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Knarley Darley
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PostPosted: Tue Feb 26, 2013 9:29 pm    Post subject: Reply with quote

Here is the update. It has .012 end play, the old engine had .010 I don't think that is the problem. The crank flange has less than 1/2 thousandth run out so would that be .0005? so that is probably not it either. The end of the converter that goes into the crank pilot looks worked pretty bad so I am thinking the pump bushing is too loose in the trans, and the weight of the converter is hanging on the flex plate and just working it? My tranny friend is stopping by in the morning to have a look.
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Paul P
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1971 Chevrolet Chevelle

PostPosted: Wed Feb 27, 2013 12:51 pm    Post subject: Reply with quote

Change the converter and the pump bushing....
If it is a lockup type there is usually a bushing for the tip of the input shaft at the back of the converter. That might also have issues.

_________________
2001 Focus 2.0 Zetec
15.63@87 MPH 1/4mi
1971 - Chevelle 408 SBC N.A.
6.95@98.6 MPH 1/8mi
10.97@121 MPH 1/4mi
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Knarley Darley
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PostPosted: Thu Feb 28, 2013 9:00 pm    Post subject: Reply with quote

I am too embarrassed to tell what the problem was or how I didn't see it after the first one broke. Suffice it to say I am a bone head! And it is fixed I think.
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