There are two differant style of nut . One style were for the pre hardened cam, (pre"80', I think) Dont know if this has anything to do with your problem but you might check and make sure you got the up dated nuts, no joke intended.  The manual says " The cap nut w/o the crome plating must not be used with the hard backed rocker arm" (yours) If you still have the old ones see that the taper BETWEEN the part where you put your wrench on and the Top servace are the same.
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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"
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