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 - Tractor Profile: Allis-Chalmers Model G - by Staff. The first Allis-Chalmers Model G was produced in 1948 in Gasden, Alabama, and was designed for vegetable gardeners, small farms and landscape businesses. It is a small compact tractor that came with a complete line of implements especially tailored for its unique design. It featured a rear-mounted Continental N62 four-cylinder engine with a 2-3/8 x 3-1/2 inch bore and stroke. The rear-mounted engine provided traction for the rear wheels while at the same time gave the tractor operator a gre
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