On a VW diesel (including D24 and D24T), it's almost certain that unless the engine is super low mileage or has used synthetic oil since new, your cylinder bores will be worn (tapered at top). You'll need to measure the bore wear and comprare with spec. It's almost a given you'll need to have it bored a size or two over, and get a new set of correspondingly larger pistons and rings. Luckily these parts are available fairly easily and cheaply, since they are the same parts used in the smaller and more common VW 1.6 motors.
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86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k
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