Speaking of the dump valve -- the other fun thing to do if you have a D24T with EGR is pull that valve off and see how packed with crud it is. On my two 1985 740s, the dump valve is so full of black gunk that it would never be able to release pressure even if it had to. Nasty stuff. You can also see how coated the inside of the intake manifold is. D24Ts don't plug up like TDIs do, but it is not fun to see how much junk is in your motor.
By contrast, the intake in my 1983 D24T (without EGR) is squeaky clean. EGR and diesels should not mix...
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86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k
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