Posted by fixt on December 16, 2018 at 19:13:42 from (104.169.32.228):
In Reply to: Gunky Carb Rebuild posted by nrowles on December 16, 2018 at 06:38:54:
I was tasked with rebuilding a carter 938 SD for a friend a couple years ago; it went on a 1964 CJ3B that had about 11000 miles on it and was in excellent shape.
It was full of oxide deposits and had plugged passages. I removed all the brass, float, needle valve, metering rod, all that stuff. Stripped it down to the body of the carb and soaked it in a Drano water mix. The Drano crystal stuff, not liquid. About 4 tablespoons per gallon or so, maybe a little more.
Pull it out, rinse it out, blow it out and use fine wire in all the passages. Then soak again. Then soaked in Gunk carb cleaner and blow it out. All the brass parts went in the GUNK cleaner.
I did that until I was satisfied the passages were clean enough to function properly with good air flow through the passages. It took 3 or 4 days. It was really bad. I reassembled using a metering rod I got out of a junker carb off ebay.
It starts and runs flawlessly as long as that metering rod will last. There are no more, and the last carter specialty lathe that made them was sold to a specialty carb shop in Californy, last I heard.
If you do this keep an eye on it. It will foam and get nasty from removing deposits and you don't want to dissolve your carb.
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