OK, Master cylinder.
When adjusting the brake pedal I noticed the MC was leaking pretty good from the front end, from the bore/cup.
The MC looked pretty new so I decided to try just a kit for it, NAPA had the kit for $22, 1.25" bore.
Removed the MC, disassembled, and honed the bore just enough to mostly clean up, some discoloration is OK (to me), pits are not so good.
PICTURE Referenced the shop manual and reassembled, reinstalled, checked pedal adjustment, adjusted all the brakes, and bleed them.
Details on adjusting the brakes.
Shop manual page
http://chevy.oldcarmanualproject.com/shop/1948_51truck/51ctsm0513.htmThe 51 1 ton has Huck brakes which have an adjuster on each end of the wheel cylinder, one for each shoe.
They get adjusted so the brakes just drag and then back off 5 clicks on the front and 4 flats of the hex on the rears. Some I may have adjusted more snug to start with and then needed a little more slack off so they wouldn't drag.
Now the brake pedal is very firm and the brakes work right close to the top, gives much more confidence than going half way to the floor before they work.
Having driven it and used them some they're getting seated and now the truck stops straight, before it pulled one way or the other. Still a little squeaky but that my go away, not sure.
Finally back to the carburetor troubles.
A friend offered to loan a new Zenith replacement carb if I'd fix a broken choke screw on it.
I was able to file the ends of the screw off, remove the shaft, drill the center of the screw, and as much as I don't like them... used a tiny "easy out" to remove the broken screw.
PICTURE Next I needed to make a V flange sort of adapter ring so my air cleaner would clamp to this carb. I think such a ring comes with these carbs when sold as universal replacements, I didn't have one.
Turned one from a chunk of aluminum and slit it with the bandsaw, works just fine.
first PICTURE second PICTURE The new carb worked out just fine, started quick and ran smooth. Following the instructions I made some rough adjustments.
Carb adjustment instructions PICTURE Next post, better part of a tuneup,
Grigg
