Packard Forum Index » Pre-War (1899-1942)

In addition to the theme rocker arms ... here my way to restore the 1923/4 1th series rocker arms. You can see this terrible worn tread. Nobody could offer new ones ... and before I ordered ones in "good" condition for 50 $ a piece I let them redo the way I know it's the best. The rocker arms go to a company who is specialized in metal plasma spray. They sprayed chrome molybdenum on the tread. I know this special process over 40 years and it's the best way to get a better and harder surface than the new ones were. But there was the question if this both different metal sorts will hold together. The company shows and declared me that this in an examined and certified process sins a long time. The chrome molybdenum plasma is shot with more than 900 yards per second on the sandblast rocker arm surface and will never split from this place. After this procedure the machine shop bring them in into the old size by grinding and polished the new surface in a ? inch radius on an old rocker arm grinding machine.
Karl

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Hi Carl,

That is some nice machining and the finished product looks first class! Thanks for sharing. In my work life, I was involved with companies that case-hardened surfaces like that for valve bodies and pipe linings that were conveying highly abrasive slurries, etc., and I never saw the metals separate. As you say, I think it is a 'tried and true' process that has been around for a very long time. Chris.

Most impressive. Quite an effort...kudos

Karl,
Wunderbar! Das ist sehr klug.

You are really doing things correctly.

mfG,
Pat

I've heard of them using spray welding to build up crankshaft journals and they say it works great.