 The pony motors I have completely disassembled for overhaul were yellow under the green. The yellow that Deere used wasn't really a primer, but a low-grade enamel, probably with a pint of flatting agent in the drum, that was used as a sealer to protect the surface and to fill and seal minor sand holes and pits. If you look closely, most times they put a red on the inside and yellow on the outside, but it did depend on what they had on the line at the time. When casting iron parts, the castings need to be "normalized", so they would set them outside in the lot to normailze, and since they didn't want every surface to rust, they sprayed them, even sometimes dipped them, to stuck fast any sand that would not shake or tumble out, and to protect the casting from rusting so that cutting oil and water-based machining coolants would drain out faster, and make chip blow out and downline wash operations drain faster. It made the milling, boring, honing experience much neater. "Painting" the parts prior to machining protected the parts, and and only required the machined areas to be protected with Cosmolene for storage and shipment. Internal parts that were cast or forged were also normalized, but they were allowed to rust and then they were cleaned in a Wheelabrator and dipped in wash oil prior to their trip down the line. I guess they didn't want the paint on a moving part as that could have aggitated the paint enough to cause it to flake off. Today, you can do the same thing if you have a casting stripped down, but you have to use care not to get your coating on a machined surface. I like to apply a product like "Glyptal" inside blocks, heads, and housings, because it speeds the drain back of lubricant to the sump since the oil doesn't cling to the rough casting walls near as much. Here's a photo of Glyptal on my VAC's cylinder head. The Deere stuff on the inside appears to me be a Glyptal type product. The outside seems to be the cheapest enamel of the day that they could apply, since it was only used for temperary weather protection. My two cents. Frank
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