Need help adjusting rocker arm
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Elder User
Joined: Sep 2003
Posts: 926
Likes: 3
From: SE, Michigan
Need help adjusting rocker arm
I need some help adjusting my rocker arms on my 82 F100. I have the 5/16 pressed in studs. The problem is I had a cracked rocker arm boss when I had the head rebuilt. The machine shop had it welded, and replaced that single stud with a screw in 5/16 stud. The problem is the threads on the top of the stud are about 1/8 of an inch longer than all the others. If I torque the nuts like the book says 17-23 ft lbs it bottoms out that lifter. I know all the other rocker arms are not adjustable. What about this lone rocker arm stud? Is it adjustable and how do I adjust it so I can get the desired .125 - .175 valve to rocker arm clearance with the lifter bottomed out and not have the nut back off? Thanks
Postmaster
Joined: Jul 2003
Posts: 2,711
Likes: 2
From: Pittsburgh
Use a second nut as a jam nut on that stud. Run the first nut down to zero lash+3/4 turn and then lock it up with the other nut. If you need the rocker to go down further, just put a 3/8 washer under the nut but over the pivot.
I converted my entire 5/16 press in setup to be adjustable with this setup and haven't had an issue yet (2 years). I'd recommend converting your whole valve train because after i rebuilt my head torquing the nuts over tightened about 1/2 of teh valves and under tightened the other half. Now i just set them all to 0+3/4 and it runs smooth as can be.
Justin
I converted my entire 5/16 press in setup to be adjustable with this setup and haven't had an issue yet (2 years). I'd recommend converting your whole valve train because after i rebuilt my head torquing the nuts over tightened about 1/2 of teh valves and under tightened the other half. Now i just set them all to 0+3/4 and it runs smooth as can be.
Justin
