Yellow oxide primer as you referred to, is often used on aluminum parts. Notice aircraft are universally primed with that color primer.
The autolite regulator is of aluminum construction so no surprise there. I have found many coated that way.
The WWII Jeeps had aluminum master cylinders. My recollection is that they switched to cast iron near the end of the war. Is you M/C aluminum? _________________ '52 Dodge M37, '42 GPW, '48 FrankenJeep CJ2A/M38, '50 CJV-35(U), '51 M38, '42 WC-57 Command Car Undergoing factory original restoration, '44 WC-51 Weapons , (2) M1941 Sperry 60" Anti-Aircraft Searchlights, John Deere M-gator
The yellow or very light greenish paint used for many years to prime anything aluminum was Zinc Chromate. It has drawn the ire of the EPA and has been pretty much replaced with Zinc Phosphate. The chromate does better on field work and yes it is harder to find and cost more. The phosphate is adequate when the aluminum is properly cleaned and prepped. The most common prep is Alumaprep which is also pricey nowadays.
The very early M38's had aluminum master cylinders from Willys factory. If you look in your ORD 9 the aluminum 7697478 master cylinder is illustrated on page 237 and the cast iron master cylinder 7416478 is illustrated on page 238. _________________ Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100
Found another place that primer was used. The bullets for the front blackout markers are painted with it before OD. _________________ '52 Dodge M37, '42 GPW, '48 FrankenJeep CJ2A/M38, '50 CJV-35(U), '51 M38, '42 WC-57 Command Car Undergoing factory original restoration, '44 WC-51 Weapons , (2) M1941 Sperry 60" Anti-Aircraft Searchlights, John Deere M-gator
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