The valve stem seals are usually not a problem with these engines as they dont produce the vacuum that a gasser does. $350 outa my wallet, would be enough inspiration to learn how too adjust the valves. You should be able too do it in less than two hours and check your "chain stretch" too, you'll be able to do it in half the time next time.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"