Engine Ticks at High RPM?
Registered User
Joined: Apr 2007
Posts: 549
From: Lancaster, Texas
The problem turned out to be the #5 intake rocker somehow loosened and popped off the valve head. Only the side of the rocker was pushing the valve down. I know I tightened the lock allen screw. If it does it again (and doesn't destroy the engine in the process) I'm switching to hardened pushrods and guides, and some new rockers. Oh, and I also shot some air down the pushrod. On startup everything was fine and I pushed the revs over 5k and check the rocker one last time before I buttoned it up. Crossing my fingers...
Hal
Hal
If that's the case, you're really lucky, because that can cause the locks to pop out and drop the valve.
I wonder if that's why CompCams recommends NON self-aligning rockers/guide plates and hardened rods in performance applications.
Jake
West Point ROCKS!
Thread Starter
Registered User
Joined: Jun 2002
Posts: 798
From: San Jose, CA
Are you saying the rocker was opening the valve by depressing the retainer, not the valve stem tip?
If that's the case, you're really lucky, because that can cause the locks to pop out and drop the valve.
I wonder if that's why CompCams recommends NON self-aligning rockers/guide plates and hardened rods in performance applications.
Jake
West Point ROCKS!
If that's the case, you're really lucky, because that can cause the locks to pop out and drop the valve.
I wonder if that's why CompCams recommends NON self-aligning rockers/guide plates and hardened rods in performance applications.
Jake
West Point ROCKS!
The lock allen never did make that much sense to me. I guess it's super important that you tighten the lock allen while holding the outside nut in place so they don't turn together that last little bit. That way the locknut is actually using a binding action that may provide a real lock.
Hal
Last edited by Hal Fisher; Jun 9, 2009 at 02:58 PM.
Registered User
Joined: Jul 2002
Posts: 1,942
From: Kissimmee, Fl, USA
Sorry, what I meant to write was the rocker side was pushing the valve STEM down. Yeah, I don't know if I like this SA set up anymore.
The lock allen never did make that much sense to me. I guess it's super important that you tighten the lock allen while holding the outside nut in place so they don't turn together that last little bit. That way the locknut is actually using a binding action that may provide a real lock.
Hal
The lock allen never did make that much sense to me. I guess it's super important that you tighten the lock allen while holding the outside nut in place so they don't turn together that last little bit. That way the locknut is actually using a binding action that may provide a real lock.
Hal
I'm glad to see it was something as simple as a loose rocker.
Thread Starter
Registered User
Joined: Jun 2002
Posts: 798
From: San Jose, CA
The technique I use involves setting the preload, tightening the allen lock screw and then turn the whole lock-nut set-screw assembly about a 16th of a turn. That jams everything together and has held for quite a while now. I think simply tightening the lock screw down doesn't provide enough 'force' on the union...
I'm glad to see it was something as simple as a loose rocker.
I'm glad to see it was something as simple as a loose rocker.
page 2, step 4
http://69.20.53.62/pdf/425e.pdf
Hal
Registered User
Joined: Jul 2002
Posts: 1,942
From: Kissimmee, Fl, USA
I need to make sure this is done right. I'll go back out and do it that way. I certainly don't want to ruin my engine because I was being lazy. Crane just recommends you hold the nut while you tighten the set allen.
page 2, step 4
http://69.20.53.62/pdf/425e.pdf
Hal
page 2, step 4
http://69.20.53.62/pdf/425e.pdf
Hal
Anyway, a little turn with both the polylock and the set screw won't hurt anything...even if it doesn't help....chuckle.
Registered User
Joined: Apr 2007
Posts: 549
From: Lancaster, Texas
The technique I use involves setting the preload, tightening the allen lock screw and then turn the whole lock-nut set-screw assembly about a 16th of a turn. That jams everything together and has held for quite a while now. I think simply tightening the lock screw down doesn't provide enough 'force' on the union...
Jake
West Point ROCKS!
Registered User
Joined: Sep 2007
Posts: 263
From: tracy
The technique I use involves setting the preload, tightening the allen lock screw and then turn the whole lock-nut set-screw assembly about a 16th of a turn. That jams everything together and has held for quite a while now. I think simply tightening the lock screw down doesn't provide enough 'force' on the union...
I'm glad to see it was something as simple as a loose rocker.
I'm glad to see it was something as simple as a loose rocker.
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