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Old 11-19-2012, 12:46 AM   #1
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Default valvetrain noises

I have a 94 z28 m6 completely stock with 108k. I was getting on my car pretty hard the other week. Aafter other made a ticking noise. When I got home from the 2 hour drive I pulled the valve cover and noticed my number 7 cylinder ex rocker was crooked. I pulled the rocker of and the rocker stud had a huge gash in it from the rocker arm. I replaced the stud and arm a few days later.. I inspected the pushrod and it was fine. I put it all back together. I started the car up and I ran the rack on it. Once the car warmed up I ran the rack again. The damn noise is still there . It only makes the ticking noise once it warms up and above 1500 rpm. I in higher rpm it's almost limits intermittent. So fort thing that came to mind was a collapsed lifter. I put new ls7 lifters in it. The damnemonic noise is still there once my car war,msn up. I even tried switching the rocker and push rods around. The noise is there there on number 7 ex. My oil pressure is between 20-25 at idle. And 40 cruising. I have no idea what is causing this. I've looked through several threads and no actubal answer. If someone can help , e out I'd really appreciate it.
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Old 11-19-2012, 12:47 AM   #2
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I checked the injectors and it's not the,m, chdecked the wires, and checked for ex leaks
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Old 11-19-2012, 10:16 AM   #3
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Since you have changed the stud, rocker, and lifters, and have switched valve components around with the noise staying in the same place. Have you thought about damage to cam lobe, or maybe the sound is not coming from the valve train at all. A rod knock when it just starts out can be easily confused with valve train noise.

I would check the cam, and pull the oil pan and examine the rod bearings of that cylinder. And since your in there, check all the rod bearings.
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Old 11-19-2012, 11:14 AM   #4
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I'm pulling the cam today.
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Old 11-19-2012, 12:32 PM   #5
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let us know what you find.
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Old 11-19-2012, 01:12 PM   #6
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Collapsed lifter.
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Old 11-19-2012, 03:55 PM   #7
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Replaced the lifters.
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Old 11-19-2012, 03:56 PM   #8
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I pulled the cam and took it into a machine shop. The cam is in good shape
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Old 11-19-2012, 08:49 PM   #9
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Almost put back together
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Old 11-20-2012, 05:22 PM   #10
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I still say collapsed lifter. I would pull the intake and at least check the #7 ones out. If they are LS7s or "stock replacement from GM" aka LS7s people have been having this problem lately.
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Old 11-20-2012, 05:25 PM   #11
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I just replaced the lifters with the ls7s last week.
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Old 11-20-2012, 05:27 PM   #12
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And after I replaced them, the engine continues to make the noise
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Old 11-20-2012, 05:51 PM   #13
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sure its not an exhaust leak at the header flange? they can be really temperature dependant and hard to detect..
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Old 11-21-2012, 10:10 AM   #14
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Quote:
Originally Posted by needsoles View Post
And after I replaced them, the engine continues to make the noise
Ah ok, I misinterpretted that. MY BAD
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