Based on what i can remember about these engines, i dont have a manual handy but just from memory.
you would set the crank at tdc, then check the mark on the crank is inline with the mark on the timing case or block, where ever it is, it may have both, it may even be just a pin, i can't remember which this block has on it.
then the cam timing mark should align with a mark on the head/timing cover at a 90deg position. There will be some sort of mark or raised arror indicator made into the casting usually.
There are also colored links on the timing chain itself that should align with the marks on the gears.
i have plenty of FE and F2 series service books but this D5 was usually not that common unless ordered special. It was not quite as popular as the FE or F2's. Between these 3 engine models the D5 is the only one with a timing chain and not a belt like the others.

if i can find any difinitive info i'll come back and confirm