Up until now I had been able to sandblast and reuse all the original parts from the engine, excluding fasteners. The first part that had to be totally made from scratch was the D-valve slide rod. This is a simple steel rod with threaded ends and a smooth midsection, which transfers the motion of the valve crosshead to the valve itself. It is necessary to use a small rod for this purpose because the valve chest is pressurized during operation. The smooth rod passes through a seal into the chest, and it must remain pressure-tight at all times during sliding motion. The original rod was heavily corroded and pitted and would no longer seal correctly, so I made a new one from a piece of steel rod.
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| The original: corroded, bent, and totally useless except as a pattern. |
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| Beginning the new part |
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| Cutting the first thread on the new valve rod |
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| Checking thread length |
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| Cut to size |
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| Threading the opposite side |
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| Checking dimensions |
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| Loosely assembled |
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| Checking the fit |
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