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With the exception of the water pump, your cooling seems to be in good shape. However there is a possibility of sediment and crud build up in the block and covering the passages in the head gasket, however, I feel that is a longshot. I might start looking into the possibility of overfueling. Do you know what condition your injector nozzles are in? How is your fuel mileage? BTW, the smoke from your exhaust manifold is most likely because the metal tube connecting the two halves of the manifold is missing.
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1987 300TD Turbo 5-spd
1991 350 SD Turbo (Frankenstein 603.970 crank, rods and head on a .50 bored 603.963 block  )
1982 300D euro 617.951, 4-spd
2003 E500
2000 GMC C2500 6.5 TD (Double ott, ex DOT truck)
1980 Scout Traveller SD33T (Resting!)
1997 GMC K2500 Burban 6.5 TD (mid engine rebuild)
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