It's been over thirty years since I was inside a diesel, but here are a few thoughts:
1. It should be nearly impossible for oil to leak pass the valve guides on a turbocharged engine, since both intake and exhaust ports have positive pressure most of the time, and oil under the valve cover shouldn't have any pressure. The only way oil is going to make it into the exhaust is if it's under pressure.
2. Is your customer ABSOLUTELY CERTAIN the oil problem didn't exist before the first "rebuilder" went into it? That's important! If it was OK before it was worked on, then the first guy put it back together wrong and you just repeated his mistake. But if it was already blowing oil when he took it in, then something broke inside the engine and neither of you have found it.
3. Do you know exactly what, if anything, the first guy touched in the engine? Were injectors pulled? Sleeves pulled?
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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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