Roller Rocker arm adjustment

[70RS]

I just got the engine back in my car and running rocker arms were a little noisy so I pulled off the covers and got the engine on TDC #1 Adjusted all the valvles that were closed than turned the engine over 360 degrees and adjusted the rest. Started engine back up and it was worse. Now I pulled the valve covers back off and checked them one by one exhaust open adjust intake intake open and almost shut do exhaust. I am am haveing trouble figureing out if am zeroing out the lash or not. I have been sliding the push up and down while tighening the rocker nut than turning a quater turn than tightening the lock screw . With them set like this there is no play in the push rod but I can feel the plunger moving in the lifter I could really use some advice I don't want to take this apart again . I want to get this car car out and drive it before winter gets here.

[malihoochie]

There are many ways to adjust valves, but I have always preferred to get the motor on # 1 TDC (on the compression stroke). Then adjust both of the #1 cylinder valves. Then turn the engine 90* and adjust the next cylinder in the firing order. Turn motor another 90* and go to the 3rd cylinder in the firing order. continue until you have done all cylinders. You will end up turning the motor over 2 complete revolutions, but it keeps the process pretty easy. You may want to adjust the rockers to a quarter to a half turn rather than just a quarter. Best of luck getting your ride running.

[David Pozzi]

You don't want any pressure on the pushrod, that is zero preload, then tighten (usually 1 turn) from there. some you can twist the pushrod even when there is some pre-load. If you are not certain, get help! You can damage the engine if you get it wrong. Anti pump up lifters require 1/4 turn max from zero pre-load

Here is a good valve adjustment link: http://www.classiccarauto.com/impala...t_valves.shtml

[Ranaexcavating]

Unless you are going to adjust them running you will need to back all the rockers off from their pre-load. If not you will never get back to zero lash.

[72Z/28]

The followings are two short videos on how to adjust rocker arms. In fact, I believe they're informative.



http://www.youtube.com/watch?v=89o5r...eature=related

http://www.youtube.com/watch?v=7GbmXSK7VI0

Good luck

[yokomo]

I start out doing that, ....then I like to do mine when the engine is running. To get that final adjustment. Loosen one at a time til they start clacking, then tighten accordingly. When I get done, it runs like a sewing machine.

[camaroguy]

I dont mean to sound like you dont know what you are doing but I have a story about something that happened to me a couple years ago. I built a SBC and fired it and had a slight noise sounding similiar to rocker or lifter noise. After a lot of work, I discovered the dome on my pistons were slightly tapping the edge of the combustion chambers on my heads. Nightmare!!!

[BlueBull]

I’ve used this method several times with good results on hydraulic lifters. Adjust to zero lash and then about ¾ of a turn to preload the lifter.

“Rocks” means that exhaust valve is just about to close and the intake valve is just about to open. Both valves are in motion.

When this happens the piston in the table column “adjust cylinder” is at the end of the compression stroke and the lifters are on the heal of the cam lobes.


Cylinder “rocks” Adjust cylinder

1---------------6
8---------------5
4---------------7
3---------------2
6---------------1
5---------------8
7---------------4
2---------------3

I'm not sure this method having any disadvantages but I used it without problems.

/Emanuel