Panhead Rocker Arm Restoration

[Times Welding]

Guys, I need some step by step how to on restoring my rocker arm assemblies. I was assuming I could grind the arm bearing surface between centers but there's one only a center in one end. How do I restore their surfaces ? Secondly, I thought I'd cut the parting lines of the blocks on a surface grinder, then re-bore them and finish hone the bores. How do I restore the end play tolerance? I'm considering silver soldering the ends of the blocks then facing them in a lathe. Is silver solder too hard to be a good bearing surface? Any input would be greatly appreciated. Thanks in advance. Doug.

[hplhd]

pm sent

[Hog54]

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[hplhd]

hell that video explains everything.

[Hog54]

You have to watch all of them.

http://www.youtube.com/results?search_q ... C1U_3czJWE" onclick="window.open(this.href);return false;

[kitabel]

I saw a lot of work being done, but very little explanation.
I only watched 10 parts, so that's like 1/3 of the total, but I didn't see how he restores the pad radius, or even measures it?

[kitabel]

Strictly speaking, using only 2 different shapes (rear exhaust-front intake are mirror images of the rear intake-front exhaust) for all 4 valves isn't correct, but the error is pretty small so the accountants win over the engineers (as usual).
The difference: all of the big twin single-cam motor (knuck, pan, shovel, Evo) have identical handed (mirror-image) heads as to valve gear, but the cam, tappet blocks and tappets are not centered in the "V" angle. This is not a mistake, it's high quality engineering (and present in the 4-cam motors also). The offset reduces the pushrod angle in the rear cylinder and adds to it in the front.
The rockers are also quasi-identical because the factory cam (almost?) always used the same lobe height/lift for the intake and exhaust lobes. Many aftermarket cams also do this - but not all. If the lift differs by more than 1/32" (IMHO) the "identical" rockers should be re-contoured accordingly, creating 4 different rockers.

Does anyone have the panhead pushrod length (can't find my notes)?

[Cotten]

Strictly speaking, using only 2 different shapes (rear exhaust-front intake are mirror images of the rear intake-front exhaust) for all 4 valves isn't correct, but the error is pretty small so the accountants win over the engineers (as usual).
The difference: all of the big twin single-cam motor (knuck, pan, shovel, Evo) have identical handed (mirror-image) heads as to valve gear, but the cam, tappet blocks and tappets are not centered in the "V" angle. This is not a mistake, it's high quality engineering (and present in the 4-cam motors also). The offset reduces the pushrod angle in the rear cylinder and adds to it in the front.
The rockers are also quasi-identical because the factory cam (almost?) always used the same lobe height/lift for the intake and exhaust lobes. Many aftermarket cams also do this - but not all. If the lift differs by more than 1/32" (IMHO) the "identical" rockers should be re-contoured accordingly, creating 4 different rockers.

Does anyone have the panhead pushrod length (can't find my notes)?

Kitabel!

An early hydraulic rod in my stash is 9 3/8", radius to radius.
I 'spose 61s were shorter than 74s, I don't remember!

And Folks,
I really regret that I cannot view the utube links, and it is all my fault.
But someone please tell me, did they hone the blocks torqued to a spec upon a plate? Was it like 15 ft-lbs?

Thanks in advance,

....Cotten

[Huck]

I looked a few, his mission seems to be getting the rocker at a right angle to the push rod at mid lift on the cam. He’s adding material to the pad then re-shaping the pad for a nice run on the stem. He’s made a jig to hold the rocker parallel to a disk sander then eyeballing the pad, sweeping the rocker pad about 20 degrees on the disk. Has another jig to set rockers side by side, the jig sets the rockers even using stops for the ball end allowing one rocker to be matched against another.

Dam Cotton you need to write a note to Santa about a new computer.

[kitabel]

Thanks, I'm glad I asked, because (although I can't find it) I'm pretty sure my guess would be way off.
Why important?
The cam centerline offset is only 3/32", and now that I have the pushrod length I can figure out how many degrees it changes the pushrod angles.
The rear exhaust and intake pushrod angles becomes about 1/2° closer to the bore axis (45°), and the front exhaust and intake pushrod angles becomes about 1/2° farther away from to the bore axis. An EL correction would be slightly higher.
As I suspected, not worth bothering with.

I didn't see the part where the caps are tied down, but he seems to know what he's doing.

[Panacea]

Was the practice of using one longer rod for the front exhaust started by the motor company?

[Times Welding]

Is there an aftermarket rocker arm being produced that is worth having? Of so, who's?

[hplhd]

did you get my message?

[Times Welding]

did you get my message?

Hot the message about "indianut" but couldn't find his posts

[kitabel]

Not sure, based on my parts books all pushrods were the same length when installed in new motors, but IDK about shovelheads.
There is always some misalignment between the tappet centerline and the pushrod as the rocker arm's pushrod end oscillates front to back as the valve opens, and this is slightly reduced by running the tappet as low as possible and making the pushrod longer. The FX is the longest so it needs most help.