Screw, 87-89 FC, Grille, possibly other apps.

[one_dusty_hoot]

The grille on the 87 Forward Control is held in place
by (16) 1-5/8"x1/4-20" thread dog tipped screws. The
dog tip acts as guide to facilitate easy threading in
the rivet nuts, (riv nuts).

After removal, a close examination of the screw
thread with a magnifying glass showed the area cut,
"the dog",caused the start thread to be almost touch
the adjoining thread. This was found attempting to
start a 1/4-20 nut on the screw by hand, wouldn't
turn. Of the 16, only 5 could be turned by hand.

This has wallowed out the threads of the riv nuts
and in some cases caused the nuts to seize on
the threads rendering them useless and a pain to
remove.

Remedy: Remove the screws then test each one
by hand turning a nut onto the screw. If not possible
I found it easier to use a 3/16" allen wrench to hold
the screw then with a 7/16" wrench turn the nut. If
you try to use a die to chase the threads before
using the nut you will damage the screw.

Riv nuts are aluminum with steel threads, there is
steel to steel contact with screw and nut but still
oxidation, rust. I recommend coating the threads
with an anti seize compound, it will help some to
make the next removal easier.

Now on to the riv nuts.

Bob Janes, 87FC35, Greenville, SC