LT1-LT4 Modifications 1993-97 Gen II Small Block V8

valve adjustment

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Old 06-20-2013, 06:11 PM
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Default valve adjustment

well.. i adjust my valves with the car running. i can get them all but 1. i adjust it and the noise comes back every time! bad lifter?? or what causes this? thanks again
Old 06-20-2013, 07:24 PM
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If it is not a cracked rocker or the nut backing off, it's the lifter.
Old 06-20-2013, 07:27 PM
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this^^^^^
Old 06-20-2013, 07:33 PM
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sob. all new ls7 lifters and one comes in bad? bastages.
Old 06-20-2013, 08:24 PM
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I had the same thing happen to me last year after only a few hundred miles on the new ls7s in the new engine.
Old 06-20-2013, 08:39 PM
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you replace all of them? or just the ones that went out?

also will a lifter fit up thru the head or do you need to remove intake?
Old 06-20-2013, 08:59 PM
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Intake must be removed.
Old 06-20-2013, 09:15 PM
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fighting the same thing right now with LS7 lifters.

No matter what I can not get the ticking noise to go away from the passenger side.
Old 06-20-2013, 09:34 PM
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is there a better option than these lifters? or is it something they do? if ima take the intake off i can just replace them all unless this is not a known issue? they were all brand new
Old 06-20-2013, 11:26 PM
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holy.. $40 for a single replacement??!?!?

am i gonna have to buy just a whole set and have that many spares?
Old 06-21-2013, 06:24 AM
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Originally Posted by Camaro350Z28
holy.. $40 for a single replacement??!?!?

am i gonna have to buy just a whole set and have that many spares?
Are you sure the adjusting nut isn't backing off? Are you using OE style nuts or poly locks?
Old 06-21-2013, 06:30 PM
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im using poly locks.. im not aware that its backing off? i adjusted all of them and it seems to be the 1 thats really noisy. all of them seem noisier than before the comp pro mags but i thought that was normal.

ill try readjusting it again and make sure i tighting it up while holding it
Old 06-21-2013, 11:53 PM
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How did u adjust the lifters? By feel with roller the p-rod with your fingers or by noise? Because one method is error likely i have to ask before advising trying anything else.

Noise can also be from tiny exhaust leak(s) and can surprisingly sound like a lifter tick.

cardo
Old 06-22-2013, 12:43 AM
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I had a poorly machined Polly and it made a bastard bitch out of my valve train for a while till I found it wearing into the damn rocker and ordered a full set of replacement pollies.
Old 06-22-2013, 07:13 AM
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Originally Posted by Camaro350Z28
im using poly locks.. im not aware that its backing off? i adjusted all of them and it seems to be the 1 thats really noisy. all of them seem noisier than before the comp pro mags but i thought that was normal.

ill try readjusting it again and make sure i tighting it up while holding it
If you feel like getting technical, ARP recommends a tightening torque of 22 ft/lb, for the set screw on the Poly Lock....and to my experience, roller rockers are noticeably louder than OE rockers.
Old 06-22-2013, 03:38 PM
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well i did it all by feel to start and then just didnt feel comfortable for some reason so i back em all off while running and did noise and 1 just kept coming back. perhaps the lock was backing off. ill remove the valve cover again today
Old 06-22-2013, 04:11 PM
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So does that mean u adjusted them by rolling the p-rod to find zero lash and it started making noise or u adjusted them by feel and just didn't like doing it that way and readjusted them by noise after which the noise started?

Just trying to help but i can't know how u did the adjustment and where it went wrong over the internet unless your honest enough to tell me.

Before u tear into the motor u could try it again using the feel for zero lash method unless the damage has already been done. Remember zero lash is when the p-rod just starts to drag but u can still roll it with your fingers - no up or down movement.

cardo
Old 06-22-2013, 04:36 PM
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Originally Posted by Camaro350Z28
well.. i adjust my valves with the car running. i can get them all but 1. i adjust it and the noise comes back every time! bad lifter?? or what causes this? thanks again
Originally Posted by cardo0
How did u adjust the lifters? By feel with roller the p-rod with your fingers or by noise? Because one method is error likely i have to ask before advising trying anything else.

Noise can also be from tiny exhaust leak(s) and can surprisingly sound like a lifter tick.

cardo
Originally Posted by Camaro350Z28
well i did it all by feel to start and then just didnt feel comfortable for some reason so i back em all off while running and did noise and 1 just kept coming back. perhaps the lock was backing off. ill remove the valve cover again today
Originally Posted by cardo0
So does that mean u adjusted them by rolling the p-rod to find zero lash and it started making noise or u adjusted them by feel and just didn't like doing it that way and readjusted them by noise after which the noise started?

Just trying to help but i can't know how u did the adjustment and where it went wrong over the internet unless your honest enough to tell me.

Before u tear into the motor u could try it again using the feel for zero lash method unless the damage has already been done. Remember zero lash is when the p-rod just starts to drag but u can still roll it with your fingers - no up or down movement.

cardo

The spin the pushrod method causes a LOT of headaches, the vast majority of folks will go way too tight that way. No need to spin to find zero lash especially not with poly locks that you just spin down till they touch. Harder with stock locks but polylocks make it real easy.
Old 06-22-2013, 05:11 PM
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heading out soon to pull the one valve cover and double check. i already double checked passenger side as i had a hard time getting a valve cover to seal there so i went over it extra. ill do driver side another time and make sure no nuts back off as i did on the passenger side. i used a 1/4 turn. should i go 1/2?
Old 06-22-2013, 05:31 PM
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Originally Posted by 96capricemgr
The spin the pushrod method causes a LOT of headaches, the vast majority of folks will go way too tight that way. No need to spin to find zero lash especially not with poly locks that you just spin down till they touch. Harder with stock locks but polylocks make it real easy.
WTF are u talking about. I said roll the p-rod with his fingers. "No need to spin to find zero lash especially not with poly locks that you just spin down till they touch." Saying no need to spin ... then u just spin down is as clear as mud.
Well every shop manual on the planet - included my GM '94 camaro shop manual - says to roll the p-rod with fingers until it starts to drag. Did all those shop manuals get it wrong too.
Your a genius in your own mind - and a real case to the rest of us.

cardo


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