Re: [Chevelle-list] Ticking from #4 Cylinder :-( (addidional info)

[John Nasta]

So glad to hear from you Dale because of course I had it totally backwards. Yes, you loosen it until it makes noise and then tighten until the noise goes away and then another 1/4 turn. Don’t do what I said earlier, it was totally wrong. That's why I said somebody correct me if I'm wrong, and I'm glad somebody did. My brain is not working well these days. Too much stress and not enough good times.   Good point about the plug wires too. Valves being out of adjustment would not make the noise go away when you unplug a wire, but a bad wire would. If you haven’t changed the wires lately that would be a good place to start, especially if they are touching something that gets hot. An easy way to see if your wires are arcing is to open the hood in the dark with the engine running and look for little sparks.   John Nasta     -----Original Message----- From: Dale [mailto:[EMAIL PROTECTED] Sent: Monday, July 31, 2006 6:59 PM To: 'The Chevelle Mailing List' Subject: Re: [Chevelle-list] Ticking from #4 Cylinder :-( (addidional info)   If removing the boot (hence no spark) makes the ticking disappear, I’d check the plug boot for arcing.  A lose rocker arm would make noise whether the cylinder is firing or not – it’s still going up and down.  Try switching #2 and #4 (or #4 and #6) wires at both the distributor and plug and see if the sound moves with it.  Don’t just swap the plug ends as it’ll misfire badly and defeat the test purposes.   Everyone has their own preference for adjusting hydraulic valves so you may get different opinions but here’s my method.  With the engine running at operating temp and clips in place back the nut off until you hear a noticeable clatter.  Tighten until the clatter goes away.  Let it stabilize a few seconds then one-quarter additional tightening turn.  Most books will say a half to full turn but one-quarter works for me.  Listen for any noise after buttoning it back up.  Rocker nuts have known to lose their ability to hold a set and may tend to back off again.  Sometimes switching just the nut with another rocker will solve it and sometimes a new nut is required.  If that happens and if studs are replaceable, a new stud and nut.   Dale McIntosh 1967 Chevelle Reference CD! http://www.chevellecd.com ACES #1709/TC Gold #92