Larry Bible is exactly correct. If you can,bore the sleeves and put in new pistons. They come with rings and pin.The crank is probably good, but to be sure, have it checked and put in new bearings(mains and rod).Be sure you torque and re-torque the head as stated in the MB manual. If I can you in any way, just let me know. Glad to help. You can get all the parts you will need from one of the MB parts houses in Atlanta and save a lot of money. They are MB parts and I have used them since 1967 and I have rebuilt umpteen dozens of MB engines. Most were diesels.
Bill Lewallen Lexington<Ky.