I recently acquired a '92 300D. The seller had a mechanic check injector pump pressure and in so doing removed the number 1 injector; in re-installing this it has shown leaks coming up out of space where the nozzle screws into the injector body. Have removed and retightened the two, but, still leaks. Is this a sign the injector is bad? Also, have noticed in this process that there appears to be small compression leak. Where fuel has acumulated around the pre-chamber I can see some bubbling as if the pre-chamber-head seal lacks integrity. Can this be corrected by tightening the pre-chamber? I've seen a splined socket at PP4Benz--is this the right route to try first, or is it likely that I will have to replace the prechamber as well? Or, is this normal for an engine with 140K?Read the forum frequently, and appreciate the quality of replies I've seen.