273 Rocker Arm modification jig for locking adjusters

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daves66valiant

68 Dart 340/727:66 Signet Vert 340/5spd: 68 D100
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I made a quick jig today to flatten the casting surface on these 273 rockers for locking adjuster nuts. As you can see the original castings are way off

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Measured the rocker shaft and it was .87”. It just so happens a craftsman 5/8” deep socket is also .87”. Well I drilled a 7/8 in hole in some straight scraps and the socket fit snug. Then I squared everything up to the disc sander.

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I screwed in the adjuster nut and then flipped the locking nut. I referenced it to the flat surface of the sanding disc
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I set up a couple of fences to keep things squared up. Went through all 16 rockers in about 20 minutes carefully checking each locking nut. Pretty happy with this set up.
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I made a adapter for my lathe that cuts them perfectly flat.
 
brilliant! Chuck a lifter in a 1" drill and reface it on a concave wet wheel. I saw a Sioux or Black & Decker valve grinder that had a lifter facer attachment on it. So cool.....
 
I remember when triple-R told me I had to get a flat surface on mine and I just put mine in a vise and used a file and gently made them nice and flat by hand. But this looks a lot more precise.
 
brilliant! Chuck a lifter in a 1" drill and reface it on a concave wet wheel. I saw a Sioux or Black & Decker valve grinder that had a lifter facer attachment on it. So cool.....
yeah, I got one of those attachment jigs on my Sioux valve refacer. It does a great job.

I made an arbor for my lathe to face the top of the rocker arm threaded end. I sort of cut threads on to the end of like a 5/8" drill rod, and I chuck the other end of the rod up into a 3 or 4 jaw, then I just thread the rocker onto the threads, rocker top facing lathe tailstock, until it bottoms out, then face the rocker off until it cleans up. Super easy, super quick, and the facing is exactly 90 degrees to the thread centerline.
 
Lathe would be nice to have. I’m running out of space already in my garage. Wifey has to have room for her car. Otherwise, I’d have more tools :)))

I’m happy with how everything squared up. Simple jig for anyone who has a disc sander of any size. Mine happens to be a 12”. I’m sure it would work on a smaller disc sander as well
 
A great example of how a lot of good things can be done with simple tools. Thanks for the pix!

You're exactly right.. Too much emphasis is focused upon the 'tool', instead of the 'know how'.
 
Reminds me of "adjusting" the lifter buttons on an E Jag on the grinder
Great Idea and a must do
the old rockers had interference jam adjusters which took a special tap PITA
 
If you don't have a disk or belt grinder, turn the fixture on its side and mount a grinding disk in the drill press. Will go a little slower due to less disk surface speed, but it will make it happen. Of course if you are a caveman, a file will be sufficient. :poke:
 
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