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Old 06-04-2009, 10:05 AM
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how do i set valve lash setting on a 454

i have just standerd rockers and comp srpings but im confussed on tightning them. should i tighten them when there all the way up or down ???? thanks

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Old 06-04-2009, 03:50 PM
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howdy there
'
when the lifter is all the way down on the heel of the cam lobe it rides on is when to set the rocker nuts


very easy

Last edited by fast68; 06-04-2009 at 03:56 PM.
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Old 06-04-2009, 05:01 PM
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Quote:
Originally Posted by 85 k5 mud truck
i have just standerd rockers and comp srpings but im confussed on tightning them. should i tighten them when there all the way up or down ???? thanks
You tighten them when the vavle is fully closed. Do you have a hydraulic or solid cam, it will make a difference?
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Old 06-04-2009, 11:06 PM
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Quote:
Originally Posted by 85 k5 mud truck
i have just standerd rockers and comp srpings but im confussed on tightning them. should i tighten them when there all the way up or down ???? thanks
You can't just crank down on the adjustment nuts. The procedures are different for hydraulic and solid lifters.

Here's the procedure for adjusting HYDRAULIC LIFTERS, from Crane Cams:

Adjusting Hydraulic Lifters for Proper Preload

In order to adjust the preload, the lifter must be properly located on the base circle or "Heel" of the lobe.

At this position the valve is closed and there is no lift taking place. You will need to watch the movement of the valves to determine which lifter is properly positioned for adjusting.

1. Remove the valve covers, and pick a cylinder that you are going to set the preload on.

2. Hand rotate the engine in its normal direction of rotation and watch the exhaust valve on that particular cylinder. When the exhaust valve begins to open, stop and adjust that cylinder's intake rocker arm. (Why? Because when the exhaust valve is just beginning to open, the intake lifter will be on the base circle of the lobe, the correct position for adjusting the intake.)

3. Back off the intake rocker arm adjuster and remove any tension from the pushrod. Wait a minute or two for that hydraulic lifter to return to a neutral position. The spring inside the lifter will move the pushrod seat up against the retaining lock if you give it time to do so. (If you are installing brand new lifters they will be in the neutral position when they come in the box.)

4. Now spin the intake pushrod with your fingers while tightening down the rocker arm. When you feel a slight resistance to the turning of the pushrod, you are at "Zero Lash". Turn the adjusting nut down one half to one full turn from that point. Lock the adjuster into position. The intake is now adjusted properly.

5. Continue to hand turn the engine, watching that same intake. It will go to full open and then begin to close.When it is almost closed, stop and adjust the exhaust rocker arm on that particular cylinder. (Again, when we see the intake almost closed, we are sure that exhaust lifter is on the base circle of the lobe.) Loosen the exhaust rocker arm and follow the same procedure described before in steps 3 and 4 to adjust this rocker arm.

6. Both valves on this cylinder are now adjusted, and you can move on to your next cylinder and follow the same procedure again.
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