[Mgs] rocker threads causing problems

[Clayton Kirkwood]

Hi,

 

I am putting my rocker assembly back on my head after putting new valve stem
oil seals in in an attempt to see where my oil consumption is coming from.
While tightening the nuts down on the studs, I continue to have a problem
with the threads of the nuts ripping out. I went to the local parts store
and asked for grade 5 nuts hoping that the problem was with the nuts being
ungraded. I continue to have the same problem: I tighten the nuts down to
25lbft but they never tighten and I remove the nuts and then have to remove
metal twists from around the studs. 25 lbft is the value listed in the
manual.

 

What is going wrong? My guess is that the "grade 5" nuts really aren't grade
5, but I have no way of telling: the flats don't have any markings. I know
these have to be pretty tight given all of the stresses caused by the cam
pushing on the rods. Any advice appreciated.

 

 

TIA,

 

Clayton