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Unread 08-12-2008   #1 (permalink)
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Default How would you set rocker arms?

On a stock 351 with a stock hyd cam, how would you set your rockers arms cold without the engine running. Is there a pattern to turn the crank 1/4 turn at a time to set 2 rockers on each 1/4 turn? Such as you would with a Flat Tappet Cam.
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Unread 08-12-2008   #2 (permalink)
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Originally Posted by wheelliftin351 View Post
On a stock 351 with a stock hyd cam, how would you set your rockers arms cold without the engine running. Is there a pattern to turn the crank 1/4 turn at a time to set 2 rockers on each 1/4 turn? Such as you would with a Flat Tappet Cam.

this should help you.....

1. Remove the valve covers, and pick a cylinder you are going to set the pre-load on. Only do one cylinder at a time.

2. Rotate the engine in its normal direction of rotation (clockwise) 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.

3. To adjust, back off the intake rocker arm adjusting nut and remove any tension from the push rod. Wait a minute or two for that hydraulic lifter to return to a neutral position. The spring inside the lifter will move the push rod seat up against the retaining lock, if you give it time to do so.

4. Twist the intake push rod with your fingers while tightening down the rocker arm. When you feel a slight resistance to the turning of the push rod, you are at "Zero Lash". Turn the adjusting nut down one half to three-quarters of a turn from that point for street applications. Use 1/8 to 1/4 turn for race applications. Lock the adjuster into position. The intake is now adjusted properly.

5. Continue to turn the engine, watching that same intake valve/rocker you just set. 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. 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.

There may be some initial valvetrain noise when the engine is first fired up but once oil pressure has stabilized and the engine heats up, it should quiet right down to a normal level.
 
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Unread 08-12-2008   #3 (permalink)
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Thanks alot!!!!!!!
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Unread 08-13-2008   #4 (permalink)
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That should get things right.
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Unread 09-28-2008   #5 (permalink)
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Hey guys, Will this work on a 302 (5.0 bored and stroked to 347) also? I think it will, but just want to make sure. Thanks.
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Unread 09-29-2008   #6 (permalink)
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Hey guys, Will this work on a 302 (5.0 bored and stroked to 347) also? I think it will, but just want to make sure. Thanks.
most certainly will......
 
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Unread 09-29-2008   #7 (permalink)
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Thanks rlg34750. I appreciate the input. I was looking for a way to adjust the valve lash while the engine was running, like on a chevy, but no one has done this. Sooooo, I'll try it this way. Thanks again.

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Unread 09-29-2008   #8 (permalink)
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That would work on the 302/347. Wish we could set it like you set the valves on a Chevy but since it's a Ford, we have to be different.
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Unread 09-29-2008   #9 (permalink)
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The Ford is a different animal. I wish they were as easy as a chevy to work on. I can't believe how many times I've had this new engine apart. Its becoming an old friend fast Ha Ha. Well got to go back out in the garage and adjust these valves again. I keep having these aftermarket locks become lose and throwing off the valve lash. I hate to crank on things, but I'm going to crank on these locks so I don't have to take off the valve covers again ( for awhile anyway). I should have bought a mechanical cam because I've been in there so many times already. Oh well, enough gripping and back to it. Thanks a lot for the info.

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