I posted this on the twenty third. "A friend has asked me to replace the head gasket on a 740 tubo that got hot. Water got in the oil and I noticed upon disassembly that the turbo does not spin perfectly free. I just grabbed the impellor shaft after I took off the duct hose and twisted with my fingers, it feels smooth but somewhat stiff. The stiffness level is such that the turbine does not continue to spin after it is released. In other words it will not spin like a top. The driver says that he previously took off the induction hose out of curiosity (well before the overheating incident, during a tune up) and that the turbine did not spin freely for him at that time. The engine has 140K miles and although the body is just about perfect, I'm unsure if the car is worth fixing, especially if the turbo is bad. He brought it to me, his shadetree friend, after the dealer said $1200 minimum to replace the blown head gasket. I E there is not profit motive, for me, so I don't want him to spend more money than the car is worth.
thanks for any input.
8N"

After getting a couple of responses, I went ahead and put it back together (after milling the head 25thousandths) The boost gauge shows a max boost of middle of the yellow arc. I haven't yet gotten ahold of the owner to verify where the boost was prior to the overheat, but everything seems normal.
Thanks to those who answered, now if someone could only tell me how to get the remains of a burned out glow plug out of the cylinders of my old ford diesel truck without having to remove the heads I would be most greatful.

thanks again
Matt
BTW, a local professional mechanic tells me to just crank up the truck and run it until the glow plug element either disintegrates or migrates out the exhaust. He swears that the 6.9International diesel will take that in stride. I hope he's right.