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Old 10-09-2017, 07:55 AM   #1
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Broken crank shaft in 2015 V10

A friend of mine just let me know that his motorhome has a broken crank shaft and under the warranty his is getting a new motor from Ford. I know him and we travel together so I know that he takes good care of his Rig. 21,000 miles.

Anyone else have this happen?
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Old 10-09-2017, 03:43 PM   #2
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I would think that a very significant mechanical engine part failing is highly unusual.

It sure would be interesting to know exactly what broke and why it broke. I know you said the crankshaft broke. However that is a very substantial hunk of metal to "break". Connecting rods to the pistons, on the other hand could break if bearings locked up and that would damage the crank.
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Old 10-09-2017, 08:43 PM   #3
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On the F53 if the engine battery shorts it can cause the ECM to fire well before TDC and lock the engine causing a skid. I was going slow when the engine battery in my 2001 shorted and it created a massive jolt that locked up the rear wheels for a moment. If I had been going any faster something for sure would have broken such as the crank, drive shaft, differential, rods, etc. I am glad I was just in the parks driveway when this occurred and swapping out a house battery for the engine battery got me going again with no apparent engine damage.

Lesson learned on a computer controlled engine do not ignore signs of battery failure. I had to use the boost switch to get started the day I arrived at the park and had put an automotive charger on the engine battery the night before I left and was planning on replacing it when I got home so I am supposing that when output from the alternator got high enough as I got past 5 mph the battery shorted. Glad it did not blow up and add that extra mess to deal with. Battery was never very low on water either and I always used distilled water to top it off. It was a just out of warranty Never Start from Walmart.

I can see this easily causing a broken crank especially if it happened at highway speeds.
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Old 10-11-2017, 06:42 AM   #4
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They are getting a new motor under the warranty. Ford is sending a long block. No cost to them. They were lucky they were not far from home and they had a tow vehicle with them. It could have been much worse.
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Old 10-25-2017, 07:55 PM   #5
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I have been unlucky enough to have two crankshafts break on me years ago. One was in a 64 ford dump truck and the other was a 78 dodge van. Both broke behind the front two pistons so it still ran but really noisy.
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