Yeah, sounds like maybe timing problems or head problems like rich said. Valves are not closing. Why else would you get no compression what so ever. Even severely damaged by wvo engines have some compression in the cylinders and mostly good compression in all but one -- the one that had the bad injector or glow plug. As opposed to severely damaged by anything else engines for which there can be no accountability.

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What Would Rudolph Do?
1975 300D, 1975 240D, 1985 300SD, 1997 300D, 2005 E320 , 2006 Toyota Prius