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By Brent - 3 Years Ago
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Update: The adjusting screw with the nut backed off is very loose in the rocker; they can be wiggled side to side in the rocker arm. I suspect either the diameter of the adjusting screw and rocker arm don’t match or there is excessive wear. I can’t imagine the adjusting screw should be so sloppy when threaded into the arm. It is tricky to get the correct lash set; when locked down the adjuster moves up as the threads mesh/grab.
I have ECG rockers with adjusting screws and lock nuts, is there a torque value for tightening the lock nut? Seems like there is a potential for the nut to loosen while running the engine.
I found this post: Rocker adj nuts
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By Florida_Phil - 3 Years Ago
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I have been using locking nuts like this for years. I hand snug mine with a wrench and have never had one loosen in street driving. I suppose you could put a dab of Loctite Blue on them if necessary.
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By Brent - 2 Years Ago
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After first 20 min run valve lash was at .024-.026, seemed like the lash was pretty symmetrical and I don’t know what the builder set them at, I then set lash at .020 cold. After another half hour of running the lash hot/warm is at .026 and again pretty much all the same. The ISKY spec for the cam is .018/.018 hot. I don’t think a cam failure would be so symmetrical, I hope I’m right? I suspect the threaded adjusters or rocker arm threads, the adjusters are loose in the rocker, with the nut loosened, they can be wiggled side to side. Please advise.
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By miker - 2 Years Ago
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I’ve never had a problem with the locknuts coming loose. It you couldn’t move them with your fingers, I don’t think you do either.
Do a hot reset to the isky specs, and run it till hot. With everything being the same, I wouldn’t lose sleep over the cam until I checked it again. I’ve lost cams before, and they were all over, some fine, some more .050. Never the same and so little change. There’s a lot of parts there with clearances, assembly lube, etc. Maybe make sure the pushrod cups are correct for the adjustment screws. I’ve done that wrong, but they usually split.
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