A while back I sent a plea for help on getting the valves on my newly
reconditioned TR6 head to quiet down. It seemed that no matter how
much I adjusted them they were still noisy.
I've solved the problem, thanks to a lister's suggestion, and would
like to share it with others. Actually, it's pretty simple but
something to look out for.
My '74 TR6 has 115,000 miles on it and the problem turned out to be
cupped rocker arms. Where the rocker arm contacts the top of the valve
stem there is a depression or cup due to wear, varying on each arm
from nearly nothing to as much as .04" or .05". Obviously, trying to
adjust the gap with a flat feeler gauge won't work because the gap
will be way too big in most cases. One lister, I believe it was Roger
Bolick, says he uses a very narrow feeler gauge (about 3/8" wide) to
slip into the area where the cupping has occurred and get a more
accurate measurement. I don't have a gauge like that so I found a
rocker that wasn't too badly worn, adjusted it, then rocked it up and
down to get a feel for what the others should feel like. Then I
adjusted them by eye and ear until they all felt like the good one.
Not super accurate but better than before.
So Roger, you get the cigar! Thanks for the help and thanks also to
Nick in Nor Cal for suggestions and for taking the time to answer. I
hope this helps others with similar problems.
Jim
jims@autodesk.com
'74 TR6 CF20076U
|