I learned to time a 616 when I took the head off my daughter 240, pretty hard to do that job and keep everything in time. You need to turn the engine over by hand and if the timing between cam and crank is off you cant hurt anything, she just wont turn. IP timing off, wont hurt anything. I dont know about using the "pin', on your 615 but someone will, good luck. I use the "bubble method" for timing, most will poo-baa that tho
, it works for me when i couldn't get the "drip method" too.
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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"