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I took the heads to a Carquest Machine shop. He has a long history doing work for my local Ford dealer.
I don't think it is a ring gear problem. Have you ever heard a mechanical diesel trying to start after changing a fuel filter...and it's got air in the lines...and it's hitting on some and not the other? That's what it sounds like...like there's one hole with no compression, and when it comes to the top, there's no resistance and the starter changes tone.
My dealer says they can run a virtual compression test, whatever that means. Like I said it runs fine with no misses or skips
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2005 F250 XLT Super Duty Crew 4WD. White/Silver. K&N intake. Hypertech programmer. No muffler. Stock everything else. Other trucks: 1979 Kenworth W900A, 1982 Kenworth Cabover (BJ and the Bear) 1997, 1998, and 2000 Kenworth W900's. All Caterpillar Power. 1979A model just got marine application 2-piece pistons, nozzles, and ATAAC. Sure is sweet!!! 500 to the ground, and no smoke!
Transporter and Operator of a Bauer Built Championship Unlimited Tractor Pulling Sled for the United Pullers of the Carolinas, Region IV affiliate of the National Tractor Pullers Association (NTPA), and damn proud of it!!!!
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