Valve adjusment

[Reteid]

Hi, could somebody please tell me what it means "Rocker is in DOWN" position?
Is it the push rod end or the valve stem end that is referred to?

Thank you,
Dieter from Austalia

 

[jm.]

IF you are adjusting the valves you want the one you are adjusting to have the rocker completely down on the push rod end. Then you check the clearance there between the rocker arm and the valve stem or cap.

 

[Dick L]

I think what you are calling DOWN position would be UP where it is over the valve stem. The setting of lash/valve clearance can only be set when the rocker arm is where it can not be moved to a wider gap regardless of the terminology. I was taught to set valve clearance on overhead valves while the engine was running at idle in the 1950's. I set a gap by eye and make them click when assembling the rocker assembly so it would start and run. It was years later when I found I could set them before start and not have to wash the oil off my face before going into the house. ^D

 

[ditchwitch]

Generally when the rocker arm is in the down position it also has the valve open

 

[Reteid]

(quoted from post at 18:01:48 01/28/17) IF you are adjusting the valves you want the one you are adjusting to have the rocker completely down on the push rod end. Then you check the clearance there between the rocker arm and the valve stem or cap.

Thank you, this was very helpful

Dieter

 

[jm.]

Dick that is what I also thought but looks like the poster above has been taught different or maybe I am not understanding what he is saying . I always thought it was down when the push rod end was down... Live and learn I guess. Yes I have adjusted a few in lines 6s running but learned that within two completer turns of the engine you can adjust ever valve on the head in a pretty simple operation.

 

[guido]

Hello dieter from Australia,

If the adjustment is done on a cylinder having one rocker down (valve open) assures the other valve on the
same cylinder is in the adjusting position. But there is an easy way to adjust all the valves with #1 at
T.D.C. then turning the engine 180* to adjust the rest. If you want to do it that way, give me the firing
order and I will post the procedure for your engine,

Guido.

 

[Reteid]

(quoted from post at 20:17:15 01/28/17) Hello dieter from Australia,

If the adjustment is done on a cylinder having one rocker down (valve open) assures the other valve on the
same cylinder is in the adjusting position. But there is an easy way to adjust all the valves with #1 at
T.D.C. then turning the engine 180* to adjust the rest. If you want to do it that way, give me the firing
order and I will post the procedure for your engine,

Guido.

Thank you Guido, the firing order is 1-2-3

 

[Andy Martin]

I agree with Guido. When instructions say "rocker down" it means valve open. And of course the valve that is down is not the one you can adjust.

 

[rustred]

rocker down means the valve is open.,,, how can the pushrod end move down??

 

[Reteid]

Hi rustred and everybody else who took the time to reply to my question.
Thank you very much for your suggestions, at the beginning I was more confused by the different replies but I think I have it sorted now, here are my thoughts and I hope they are correct:
If no 4 is DOWN then No 1,2,3 & 5 is UP and I can adjust the clearance and on the second turn when No 4 is UP I then adjust No 4 & 6.
So I can only adjust any given valve if the rocker end on the valve stem is in the UP position and the valve is closed, this does make sense now and I will do the adjustment tomorrow.

Thank you all again
Dieter

 

[guido]

Hello Redeit,

You said the firing order is 123? Yet you talk about 4 5 6. 😵 A right hand turning engine unusually has a
firing order of 153624? What am I missing?,

Guido.

 

[Hobo,NC]

Google "EOIC valve adjustment"

Its never failed me Yes it takes longer but it very through.

 

[Hobo,NC]

http://www.enginelabs.com/engine-te...ech-lash-is-much-more-than-just-a-little-gap/

 

[Geo-TH,In]

I'm confused with your answer.

I use a pencil in the spark plug hole to determine when piston is Top dead
center and both intake and exhaust valves are closed. Then I check valve
adjustment. It's that simple. If both valves aren't closed, rotate crank 360.

 

[Determined]

To simplify matters and avoid confusion with terminology.
You set a valve when it is at rest. (not doing anything)
Easiest way to determine it is at rest is observe the other valve for that cylinder.
Example
Cylinder # 1 intake valve open, engaged, not at rest.
This is when you can set exhaust valve for cylinder #1.

I have seen too many mistakes made by people not familiar with the proper way to use the firing order and turn 180 method.

Quick, simple and relatively foolproof method is;

-Observe valves and you will clearly see several that are engaged.
The other valve on these cylinders can now be set.
After setting a valve mark it, masking tape, tire crayon, liquid paint marker... whatever you have on hand.
-Now give the engine a 1/4 - 1/2 turn and set the ones that now are in proper position.
Continue until all are marked as being set.

Works every time and no concerns about firing order , rotation etc.

 

[sotxbill]

But remember that high performance cams have valve overlap.. meaning that the exhaust is starting to close, the intake is starting to open.. so that can bite you in the button if you turn the crank a bit too far...