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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / June 2006single barrel rochester carb with leak/59 chevy apache
i have an old chevy 235 i am trying to get running after many moons of sitting. i have a few problems with it still, one of them being the carb is leaking out of what seems to be where the piston is. i got the truck started and it ran a bit till i found the leak. i took the carb off and inspected it only to find all seems alright. when i put it back on, it still leaked and now will not even start. anyone have any suggestions? Get the carb rebuilt. >i have an old chevy 235 i am trying to get running after many moons of > sitting. [quoted text clipped - 5 lines] > when i put it back on, it still leaked and now will not even start. > anyone have any suggestions? hey, i have the carb apart on the work bench, and am reworking it with a rebuild kit. looks like there is a problem with the "piston-power". like perhaps the end of the skinny tube is kinda bent over. is it a tube with a slot for a certain amount of fuel to flow against the ball bearing in there? well if anyone knows and can help i would appreciate the direction- d redskygroup@mac.com wrote in article <1149448378.686583.7110@h76g2000cwa.googlegroups.com>... > hey, i have the carb apart on the work bench, > and am reworking it with a rebuild kit. [quoted text clipped - 4 lines] > well if anyone knows and can help i would appreciate the direction- > d Geez!! Wil you PLEASE stop using technical automotive trade jargon - "piston power", "skinny tube" "kinda bent over", fuel flowing against ball bearings, etc. If you would only use plain English, it would be much more understandable to those of us who do not have such a technical background...... ROFLMAO! WTF are you talking about!!!! I think another poster was on target when stating that you are in over your head and that you should consider hiring someone to do the job. > hey, i have the carb apart on the work bench, > and am reworking it with a rebuild kit. [quoted text clipped - 4 lines] > well if anyone knows and can help i would appreciate the direction- > d The piston you are referring to is probably the accelerator pump. although this carb may have a vacuum operated piston also. But your reference to ball bearing (check valve) and slot makes it seem you are referring to the accelerator pump. The purpose of this device is to give an extra shot of fuel when you press down on the gas pedal. This means it should be connected to the linkage that controls the throttle. When you step on the gas the (leather or rubber?) piston will force fuel past the check ball and into the throat of the carburetor. When the throttle linkage returns the check ball prevents the piston from sucking air back in so that a new shot of fuel fills the piston. The types of problems you might see here is that the fuel passage could be clogged, or the piston dried up (shriveled, cracked) or the linkage is not adjusted and working properly in order to get the right amount of fuel shooting into the airflow with each pump of the gas pedal. A warmed up engine should idle and run fine even if the accelerator pump isn't working. If it isn't working the engine will stumble or stall when you try to accelerate and when starting cold it will be harder to start. If the pump is working then pumping the gas pedal will help start when cold and will tend to flood a hot engine. Other problems you should be looking for are: Is the float working properly so that it maintains the correct fuel level in the carb bowl? Are all fuel passages open? This is about as simple as a carb gets so there is not a lot that can go wrong. -jim jim thanks so much for your taking the time to explain how the carbuerator works that totally helped me. i am having trouble with fuel leaking out of the plunger again though. i have rebuilt with carb kit and parts from a spare carb. everything seemed to be fine, but was trying to adjust the idle and air adjustment when it began leaking again. any ideas of a cure for the carb leak? > > hey, i have the carb apart on the work bench, > > and am reworking it with a rebuild kit. [quoted text clipped - 34 lines] > http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups > ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- > jim thanks so much for your taking the time to explain how the > carbuerator works that totally helped me. i am having trouble with fuel > leaking out of the plunger again though. I don't exactly understand what that means. The plunger is inside the carb bowl and is immersed in gasoline. What I'm guessing you mean is that it is leaking where the linkage passes thru the cover (top of carb). That would not be a problem caused by anything wrong with the accelerator pump. What is happening is your float (float needle valve to be precise) is not doing its job and the overflow is just coming out of wherever it can find an opening. You need to fix what's wrong with the float. It could be dirt that is keeping the needle from closing. It could be the needle (or seat) is worn or corroded and has to be replaced. Or the float may have a hole and no longer floats (if it is the hollow brass kind). Or it could be binding at the rod that acts as a hinge so the float can pivot up and down freely. When its working properly the float should 'float' and thus shut off the flow of fuel when it reaches a preset level in the float bowl (thus no fuel will leak out the top). To bench test it you can invert the carburetor (with no gas in it) and blow or suck into a rubber hose connected to the fuel inlet. If you can blow thru there (when it's up side down)) the float and needle valve are *not* functioning as they should. Until you get it so that it will not pass air when inverted and will when it is right side up there is no point in mounting it on the engine as it will overflow gas from whatever openings that it can. -jim > i have rebuilt with carb kit and parts from a spare carb. > everything seemed to be fine, but was trying to adjust the idle and air [quoted text clipped - 40 lines] > > http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups > > ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- jim <"sjedgingN0sp"@m@mwt.net> wrote in article <1149540221_29355@sp6iad.superfeed.net>... > > jim thanks so much for your taking the time to explain how the > > carbuerator works that totally helped me. i am having trouble with fuel > > leaking out of the plunger again though. > > I don't exactly understand what that means. Nor does Red-eye! |
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