LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Rocker Arm Adjustment

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Old Jan 27, 2007 | 04:28 PM
  #1  
godspeed1976's Avatar
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From: Lake Jordan/Slapout
Rocker Arm Adjustment

My car has recently developed a ticking noise that gets faster as the RPMs go up. I am assuming it is just in need of me adjusting the rockers and making sure they are snug. (Please correct me if this is a wrong assumption on my part).

From what I have read and seen in the Haynes manual it looks pretty straight forward. For my car all I need to do is:

Remove the alternator, unplug the break booster hose from the intake on the drivers side. Remove the PCV from the passenger side, set the car to TDC, remove the valve covers and check the pushrods for play by wiggling them up and down. Snug the rockers till there is no more play and give it a 3/4 turn to set them in the lifters. I can tighten the #1, 2, 5, and 7 intake valves, and the #3, 4, and 8 exhaust valves. Turn the crank one complete time (360 degrees) and adjust the #3, 4, 6, and 8 intake valves and the 2, 5, 6, and 7 exhaust valves. The reassemble everything.

While it seems pretty easy I was wondering if there was something more I needed to know like special tools I will need, or some steps to make it a bit easier. I know when changing plugs with my headers it was a PIA cause had I known I should have a shallower socket and open end wrench it would have made it much more easy. So I am just trying to get ahead of the game and see if anyone has some extra words of knowledge.

Thanks guys and gals!!
Old Jan 27, 2007 | 04:36 PM
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It could be an exhaust leak instead. I would check that first. Here is lots of info on adjusting valves.
Old Jan 27, 2007 | 07:33 PM
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Yeah it could be, you have any suggestions on tracking it down? Just tighten all the header bolts down?
Old Jan 27, 2007 | 07:41 PM
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I just pop the valve covers off and let the car idle. Loosen them until they get really loud then slowly tighten them back up until they are quiet and then give them another 1/4-1/2 turn. Works for me, have some gloves handy it gets hot under there quick.
Old Jan 27, 2007 | 09:55 PM
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Originally Posted by godspeed1976
Yeah it could be, you have any suggestions on tracking it down? Just tighten all the header bolts down?
Exhaust leaks are usually visible by black soot escaping from the leak area. You can listen and "feel" for exhaust escaping if the engine is cold enough to get your hand in places.
Old Jan 28, 2007 | 06:15 AM
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Yeah that makes since...:P I guess I deserve that for asking such a silly question.

I havent noticed any black soot,or felt exhuast leaking. When it stops raining I'll check all my header bolts, then move on to the rockers if that doesn't get it.
Old Jan 28, 2007 | 06:20 PM
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I have the same problem you are having. I even have the same car and mostly the same mods. I thought it might be an exhaust leak on my car too, but I'm pretty sure thats not the case. I'm gonna wait until I put my new cam in to adjust the rockers though. You could try opening the throttle by hand when you are under the hood and listening near the the valve covers. I think there are some other tricks like using a wooden dowel or something as a listening stick on the valve covers. Search around on the net'. Also I believe you can use seafoam to track down an exhaust leak if you think thats it. Search on that too, cause I'm no expert lol.
Old Jan 28, 2007 | 09:28 PM
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Thanks. I checked for an exhuast leak and didnt see anything. I asked some others if they heard the ticking and they looked at me as though I am crazy. So it isnt very noticable. Im gonna put several mods into the car in about 2.5, 3 months so I will do it all then unless it gets worse.
Old Jan 28, 2007 | 09:39 PM
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Yah, mines pretty loud. I can hear it when I'm inside the car driving- what about you?? I pointed it out to my girlfriend and she noticed it.
Old Jan 29, 2007 | 05:32 PM
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You cant really hear it in the car real well, but with a full exhuast, and one loud rear end its hard to hear the radio.
Old Jan 31, 2007 | 09:33 AM
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Originally Posted by dueno
Yah, mines pretty loud. I can hear it when I'm inside the car driving- what about you?? I pointed it out to my girlfriend and she noticed it.
im in the same boat as you and im almost positive its a lifter noise
Old Jan 31, 2007 | 01:54 PM
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ok heres the deal. i had what i thought to be a lifter go out. well i ordered all this new stuff and spent $1100 trying to fix this problem and it never got fixed. new lifters, hot cam kit, pushrods, all of it. it never fixed and the reason is because i spun a rod bearing. it started out as a tic then it got worse and became a knock. well after i installed all my new parts thinking it would be solved there was the same noise there was before i tore the motor down. i started doing oil press. test, spark test, etc. i finally relized if i unplug one of the spark plugs that cylinder won't fire. well sure enough i unplug the #6 cylinder and the knock stops. well that tells me two things. either a main bearing or rod bearing. my bet is a rod bearing. cheap to fix but time consuming. you have to drop the motor.
Old Jan 31, 2007 | 04:07 PM
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Originally Posted by 06lingenfelter
ok heres the deal. i had what i thought to be a lifter go out. well i ordered all this new stuff and spent $1100 trying to fix this problem and it never got fixed. new lifters, hot cam kit, pushrods, all of it. it never fixed and the reason is because i spun a rod bearing. it started out as a tic then it got worse and became a knock. well after i installed all my new parts thinking it would be solved there was the same noise there was before i tore the motor down. i started doing oil press. test, spark test, etc. i finally relized if i unplug one of the spark plugs that cylinder won't fire. well sure enough i unplug the #6 cylinder and the knock stops. well that tells me two things. either a main bearing or rod bearing. my bet is a rod bearing. cheap to fix but time consuming. you have to drop the motor.

Ewwww that sucks man!! Im sorry to hear about that. At least you caught it before you had to get a new engine all together though.
Old Jan 31, 2007 | 04:23 PM
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i really hope thats not the problem im having...
Old Jan 31, 2007 | 08:31 PM
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Originally Posted by shoebox
Exhaust leaks are usually visible by black soot escaping from the leak area. You can listen and "feel" for exhaust escaping if the engine is cold enough to get your hand in places.
Not only that but when engine is under load (accelleration) an exhaust leak will become louder whereas valvetrain noise will not.



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