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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Feb 2014 Posts: 319 Shop Shark | | Shop Shark Joined: Feb 2014 Posts: 319 | '59 235 with stock setup Two problems. First, I have a leak as shown in this pic: http://i35.photobucket.com/albums/d...20Pickup/20150522_113240_zpskmnpg4ol.jpgIt comes from around that plug (the throttle plate shaft, right?). Second, with the idle adjustment screw turned all the way in, the idle speed screw just making contact, and the throttle knob closed the engine still revs way too high. Don't have a tach, but I'm guessing 1,000 to 1,500 rpm. Are the problems related? Suggested fix(es)? Are the
Last edited by PathwayRev; 05/22/2015 9:35 PM.
A VW guy trying his hand at a '59 LB fs. Lots to learn, but it's about the journey.
| | | | | Joined: Feb 2001 Posts: 1,096 'Bolter | | 'Bolter Joined: Feb 2001 Posts: 1,096 | | | | | | Joined: Feb 2014 Posts: 319 Shop Shark | | Shop Shark Joined: Feb 2014 Posts: 319 | Float level is set spec for drop and 1/16" conservative for shut-off position.
I had gas coming out the top gasket until I tightened down the seat and re-set the float, so I'm fairly confident the top half of the carb is OK.
A VW guy trying his hand at a '59 LB fs. Lots to learn, but it's about the journey.
| | | | | Joined: Feb 2000 Posts: 5,208 'Bolter | | 'Bolter Joined: Feb 2000 Posts: 5,208 | That plug is the throttle shaft end, isn't it? It could be excess fuel running out after the engine is shut off. The throttle shaft bore or shaft end could be worn, easy enough to check, grab the throttle shaft and see how much movement you have. New bushings may help. The accelerator pump sprays fuel directly on to the shaft and blade. Modern fuels will seep out of the smallest of places and look like a giant leak, they also small like giant leaks.
Excessive idle rpm most of the time is from a vacuum leak. Check from throttle shafts down, everything from manifold bolts to wiper motors. | | | | | Joined: Feb 2008 Posts: 217 Shop Shark | | Shop Shark Joined: Feb 2008 Posts: 217 | If the throttle shaft is worn, bushings can help and possibly help the high idle. As the engine is running, wiggle the shaft and see if that makes a difference. I fixed mine with a sliver of brass sheet bought from a hobby store. You can usually get them in as assortment pack. I took the throttle plate (butterfly) off and removed the shaft and wrapped the brass around the shaft and worked it back into position. With trial and error you can find the right size. | | | | | Joined: Feb 2014 Posts: 319 Shop Shark | | Shop Shark Joined: Feb 2014 Posts: 319 | I talked with Oscar at Alpha Carbs in CA, who clearly knows his stuff. He's going to rebuild the carb, including bushings for the throttle butterfly shaft, and return it to me the next day. Very reasonable charge.
In the meantime I'm going to take a closer look at the linkage rod I had to fab because of the dual exhaust I installed. I don't *think* it's too long and/or restricted in its travel but I gotta get this part right.
A VW guy trying his hand at a '59 LB fs. Lots to learn, but it's about the journey.
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