Lifter Noise?
Thread Starter
Heel & Toe
Joined: Sep 2008
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Lifter Noise?
[I]Re: Solid lifters. If rocker to valve stem lash is correct, what could cause noise like excessive rocker to valve stem clearance? i.e. click click click Is happening on one valve only.
Thank you, FRINTZ
Thank you, FRINTZ
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Joined: Apr 2000
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From: Who says "Nothing is impossible" ? I've been doing nothing for years.
Re-lash them all, if there is still excessive noise then there are other possibilities, the ones I have personally seen are rocker studs pulling out, poly locks or plain nuts backing off, cam lobe going south, and last but not least I had a set of Comp Cams pushrods wear down at the ends on me, bad set.
One that hasn't happened to me but is a possibility is lack of oil to that rocker and it wears the rocker and pushrod tip at the same time, if there is only one make sure the pushrod oil hole is not clogged and also check the lifter itself, could be worn out
There's more but it early
Good luck
One that hasn't happened to me but is a possibility is lack of oil to that rocker and it wears the rocker and pushrod tip at the same time, if there is only one make sure the pushrod oil hole is not clogged and also check the lifter itself, could be worn out
There's more but it early
Good luck
Last edited by MotorHead; Sep 25, 2010 at 10:09 AM.
Thread Starter
Heel & Toe
Joined: Sep 2008
Posts: 18
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Yes, lash has been set hot. The noise is very much like that of a hydraulic lifter that needs adjusting. It's audible at idle as well as during rpm increases.
Thread Starter
Heel & Toe
Joined: Sep 2008
Posts: 18
Likes: 0
Re-lash them all, if there is still excessive noise then there are other possibilities, the ones I have personally seen are rocker studs pulling out, poly locks or plain nuts backing off, cam lobe going south, and last but not least I had a set of Comp Cams pushrods wear down at the ends on me, bad set.
One that hasn't happened to me but is a possibility is lack of oil to that rocker and it wears the rocker and pushrod tip at the same time, if there is only one make sure the pushrod oil hole is not clogged and also check the lifter itself, could be worn out
There's more but it early
Good luck
One that hasn't happened to me but is a possibility is lack of oil to that rocker and it wears the rocker and pushrod tip at the same time, if there is only one make sure the pushrod oil hole is not clogged and also check the lifter itself, could be worn out
There's more but it early
Good luck
Thanks again,
Race Director
Joined: Apr 2000
Posts: 17,676
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From: Who says "Nothing is impossible" ? I've been doing nothing for years.
Thanks much for the possibilities. The noise starts when the engine is started after hot lash adjustment. Wouldn't that eliminate the adjusting nut since it would have to back off? But then who's to say how quickly a nut can back off. All of the nuts seem to require the same torque. I'll check the pushrod for clogging and check the rocker studs. Could weak or broken valve springs be a cause?
Thanks again,
Thanks again,
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Thread Starter
Heel & Toe
Joined: Sep 2008
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Lifter Noise/Exhaust Leak?
Thanks still, FRINTZ
Thread Starter
Heel & Toe
Joined: Sep 2008
Posts: 18
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Tim
Thanks for the suggestion. Am using stock rocker arms and *****. Will check for wear. There was a exhaust leak at no 3. Replaced gasket. Thought that was it. Noise remained. Will check no 3 exh valve assy.
Thanks much, FRINTZ
Thanks for the suggestion. Am using stock rocker arms and *****. Will check for wear. There was a exhaust leak at no 3. Replaced gasket. Thought that was it. Noise remained. Will check no 3 exh valve assy.
Thanks much, FRINTZ
Thread Starter
Heel & Toe
Joined: Sep 2008
Posts: 18
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Lifter Noise/Exhaust Leak?
Thanks for the suggestions. I will check all, starting with simplest first. I did find and exhaust man gasket leak at no 3. Replaced gasket but noise remains. I prayed that was it.
Thanks much, FRINTZ
Le Mans Master
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From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
I forgot to add: If you find a rocker/ball that's blue, that's the one- if the bad one is on an exhaust valve, GM recommends moving a good one from an intake position to the exhaust/ GM says the intakes run a little cooler and makes it better for break in.
Le Mans Master
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From: columbus oh
Race Director
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From: Who says "Nothing is impossible" ? I've been doing nothing for years.
If you take any rockers off check the pushrod. The ends could be wearing down, ususally on top where it contacts the rocker cup.
A short story, I put a a brand new 355ci together with brand new parts. Hydraulic cam and I used brand new Comp Cams pushrods, the ones with the little ***** on the end and yes they are hardened.
I was constantly getting ticking noises and constantly adjusting the valves and looking for why I had to do this all the time.
Turns out the little ***** on the ends of the pushrods were wearing down, fast. Finally took a rocker off to inspect them and couldn't believe my eyes because I had it running with cutout valve covers and I could see they were getting plenty of oil. All 16 of them were worn down with low pressure single springs.
I replaced them with CC Magnum pushrods, and the problem went away. I use the same pushrods in my new 427ci with over 400lbs open spring pressure with no problems.
Also what oil are you using ? If not enough ZDDP then you could have a lobe going south.
A short story, I put a a brand new 355ci together with brand new parts. Hydraulic cam and I used brand new Comp Cams pushrods, the ones with the little ***** on the end and yes they are hardened.
I was constantly getting ticking noises and constantly adjusting the valves and looking for why I had to do this all the time.
Turns out the little ***** on the ends of the pushrods were wearing down, fast. Finally took a rocker off to inspect them and couldn't believe my eyes because I had it running with cutout valve covers and I could see they were getting plenty of oil. All 16 of them were worn down with low pressure single springs.
I replaced them with CC Magnum pushrods, and the problem went away. I use the same pushrods in my new 427ci with over 400lbs open spring pressure with no problems.
Also what oil are you using ? If not enough ZDDP then you could have a lobe going south.
Thread Starter
Heel & Toe
Joined: Sep 2008
Posts: 18
Likes: 0
Lifter Noise/Exhaust Leak?
FRINTZ
Thread Starter
Heel & Toe
Joined: Sep 2008
Posts: 18
Likes: 0
Lifter Noise/Exhaust Leak?
Thread Starter
Heel & Toe
Joined: Sep 2008
Posts: 18
Likes: 0
Lifter Noise/Exhaust Leak?
If you take any rockers off check the pushrod. The ends could be wearing down, ususally on top where it contacts the rocker cup.
A short story, I put a a brand new 355ci together with brand new parts. Hydraulic cam and I used brand new Comp Cams pushrods, the ones with the little ***** on the end and yes they are hardened.
I was constantly getting ticking noises and constantly adjusting the valves and looking for why I had to do this all the time.
Turns out the little ***** on the ends of the pushrods were wearing down, fast. Finally took a rocker off to inspect them and couldn't believe my eyes because I had it running with cutout valve covers and I could see they were getting plenty of oil. All 16 of them were worn down with low pressure single springs.
I replaced them with CC Magnum pushrods, and the problem went away. I use the same pushrods in my new 427ci with over 400lbs open spring pressure with no problems.
Also what oil are you using ? If not enough ZDDP then you could have a lobe going south.
A short story, I put a a brand new 355ci together with brand new parts. Hydraulic cam and I used brand new Comp Cams pushrods, the ones with the little ***** on the end and yes they are hardened.
I was constantly getting ticking noises and constantly adjusting the valves and looking for why I had to do this all the time.
Turns out the little ***** on the ends of the pushrods were wearing down, fast. Finally took a rocker off to inspect them and couldn't believe my eyes because I had it running with cutout valve covers and I could see they were getting plenty of oil. All 16 of them were worn down with low pressure single springs.
I replaced them with CC Magnum pushrods, and the problem went away. I use the same pushrods in my new 427ci with over 400lbs open spring pressure with no problems.
Also what oil are you using ? If not enough ZDDP then you could have a lobe going south.
Thanks, FRINTZ