<VV> adjusting valves - I want to believe! (one noisy one)

[Mikeamauro at aol.com]

After adjusting valves cold to 1/2 turn in  from zero lash, Bryan has one 
that remains a little noisy: :...one valve always has a  little "tick" to it..." 
He will try going to 3/4  turn.
 
Bryan... I hope the new adjustment works for you,  but I fear not. It has 
been my experience, if one or two valve  assemblies remain noisy, then adjusting 
further in will not help. The  scenario (assumes adjusting while running): 
while adjusting in, the noise goes  away; however, momentary, the noise comes 
back. No amount of inward adjustment  keeps the noise from returning; except, of 
course, over adjusting until the  lifter remains fully compressed... something 
you do not want to do. In other  words, the lifter, once it bleeds down 
following its readjustment, cannot  keep all "slop" out of the drive train. In this 
scenario described, the problem  is not the adjustment: all else in the valve 
drive train  being nominal, there should be no appreciable noise heard at 
1/4, 1/2, 3/4,  or 1 turn in adjustment points. Noise, in a properly adjusted 
hydraulic lifter  drive train, is going to be the fault of one, or a combination 
of: a faulty  lifter, weak or broken valve spring, insufficient oil pressure 
to the lifter, a  valve sticking partially open, bent/damaged push rod or 
rocker arm (look for  closely at the face of the rocker arm where it rests on the 
valve stem... needs  to be smooth with no dishing or notching), improper rocker 
arm-to-valve stem  geometry (a badly worm valve guide, or an improper length 
push rod are among  things leading to this problem). In short, if the lifter 
is good, and properly  adjusted, then look elsewhere for the source of valve 
train noise. The  following Buick site has some good generic info on causes of 
noisy lifters: _http://www.buicks.net/shop/reference/noisy_valve_lifters.html_ 
(http://www.buicks.net/shop/reference/noisy_valve_lifters.html)  . 
 
Brian... good luck, and please report back  your findings. Thanks... Mike  
Mauro        
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