<VV> noisy lifter

[Eric Lucas]

Failed rocker arms have been known to occur, even in new parts. Might be worth a quick check if you haven't already ruled it out.

Eric in Indiana
 
> Date: Wed, 19 Aug 2015 21:23:14 +0000
> To: fastvair at yahoogroups.com; virtualvairs at corvair.org; coreyp117 at comcast.net; brett.aston at snet.net; grantulip at cox.net; machineshopjack at yahoo.com
> Subject: <VV> noisy lifter
> From: virtualvairs at corvair.org
> 
>  Tearing my hair out and I don't have too much left.      A friends Corvair. 
>  Problem: an otherwise smooth running 102 PG has a loud engine "clack".
>  History: rebuilt 102 engine several years ago with no $ spared. All parts from Clark. Lifters, cam, rocker arms, push rods, springs etc. Very low mileage after the restoration.
>  The engine seems to have developed one noisy lifter. It is loud like the rocker arm wasn't tight enough, leaving clearance between the rocker arm and the valve.
> We first did a hot adjustment, as it was convenient to do that. That did not seem to work. Same noise
>  Today we did a very careful cold adjustment by the book using 3/4 turn down after lash was removed, changed oil and filter. Same old noise. The only thing I could see was that one nut on a rocker did not seem to be turned down the usual 3-4 threads after adjustment (maybe 2.5).
>  I've rebuilt and adjusted many valve trains and now I'm stumped. Would it hurt to slowly turn the one I suspect, down 1 or 1.5 turns hot?
>  As an aggressive alternate, do you think putting different lifter in the one I suspect prove anything if all else fails?
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