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rig truck help

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  • #46
    some of the carbs have a little plunger that literally squirts a stream of gas in when you floor it. my old catty had one like that. its supposed to cover the instant high volume need to keep it from stuttering wile the air flow and jets catch up to the higher need. if its working properly you should not be stuttering unless it had some thing to do with the vacuum advance in the distributor. as you have already rebuilt the dist. you might try it again before tearing into the carb, unless you just want to do a rebuild now before it starts work.
    you might check to see that the floats are not sticking.. my catty was a 1980 i think, but cant remember what carb was on it????

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    • #47
      James,

      That "little plunger" is the accelerator pump. All carbs have a version of one. They have to,or you'll have a mean stumble. The only exception I can think of might be the variable venturi carb, I read a little about it years ago. Don't know if too much came of it. It may have had a seperate accelerator pump too, I don't remember all the details.

      7 Basic circuits of every carburetor: F-I-L-M-P-A-C

      Float
      Idle
      Low speed
      Main
      Power
      Acceleration
      Choke

      Later,
      Jason

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      • #48
        Originally posted by HMW View Post
        Good thing about the old engines, everything is cheap for them and still avaliable. I would have done the same thing with the ignition, probably not been changed in along time and moisture and age tells on ignition components.
        I dont understand what you mean by squirting a fine stream all over the intake?? Engine not running, Work linkage by hand, accelerator pump will squirt fuel into intake. Sorry for the questions, just didn't want you to spend more than you need to Good luck, looks like your making good progress
        it squirts a stream of fuel when the engine is running or not, if you work the linkage by hand or with the pedal. it doesnt matter which way you choose. other than the obvious stutter and squirting .30 cents all over the intake every time i push the pedal, it runs very well and idles smooth. i had to get 2 4x8 sheets of 1/4 inch steel and 4 sticks of standard 4 inch channel, as well as 10 sticks of 1 1/2 by 11 ga. square tubing from the steel yard. it handled the load well adn pulled it fine. might have been a little much for a light duty truck, but did just fine.

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        • #49
          if its squirting it should not be stuttering ?? although i only have 1 carb now , its on my 51 but it seems like my old caddy only stutterd when it was out of time and or had a bad spark, be it plugs or wires.
          did you set the timing and is the advance working ??
          like welder_one said the squirt is a little plunger connected directly to your linkage, so it should squirt when you go full throttle be it by linkage or peddle. thats a good thing, well other then the $.30 every time. its got the needed gas so i would look at spark and air flow as the problem.
          you shouldn't have any trouble pulling 2 sheets of 1/4" and then some with it.
          its going to make a great work truck.

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          • #50
            it squirts fuel out of the front of the carb, close to the top. it squirts almost to the thermostat housing. when idling, it seeps slightly out of the top gasket, someone told me that it would make a good paper weight, except that it would get fuel all over everything..lol

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            • #51
              a rebuild kit should not be too expensive, and is not that hard to put in. just pay attention to where every thing comes out and put it back the same way. on the adjusting screws i count the turn in till it bottoms out, wright that down for when i reinstall.then take it out. that way i am almost always right on or close when it goes back together.
              good luck on it, keep us posted.

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              • #52
                well, instead of spending money an a new carb, i tried my luck on the q-jet and a rebuild kit. sos far everything turned out well. it went back together pretty easy and tuned pretty good. i drove it around today to see about fuel usage and all that. i am getting about 14 to 19 m.p.g. down the freeway. pretty good for an old carbureted v-8 4wd. i have a couple more pics of the truck cleaned up.
                Attached Files

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                • #53
                  Your truck is looking SOOO great!!!! Wish I had the expertise you do, but since I'm just getting into welding, I'll just concentrate on that first
                  I'll let my friend do the mechanic work
                  bert

                  Comment


                  • #54
                    Gas Rigs

                    Don't anybody cut a gas engine short.My rig is a 1990 Ford F-450 Super Duty. It has a fuel injected 460,E4OD trans and a Dana 80 rear I have over 550,000 miles on this truck. I jerked the engine at 325,000 miles and rebuilt it, the rebuild has 225,000 on it now.I had the trans rebuilt at 350,000 and its still going strong. I also put a new cab and front clip on it at about 375,000 miles due to all the salt we use in Michigan in the winter. The cab and front clip came from Alabama. I don't baby this truck one bit. This truck weighs in at close to 15,500 lbs. +/- 1000 lbs depending on what I'm hauling at any given time for a particular job. It runs up and down the road at 70-75 mph. I service the truck regularly at 3000 miles and do a complete oil change on trans once a year, thgats quite easy on this truck because the torque converter on these trans has a drain plug so I can drain all 19 quarts of tranny fluid. This has been a great truck and engine,trans and rear end combo for me. I only need to work 2 1/2 more years and I dont figure on getting a new rig, In fact I figure I'll keep doing a little side work so me and my rig will just be semi-retired. Anyhow enough ramblin, JUST DON'T CUT A GAS RIG SHORT Jim

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                    • #55
                      LOl, squirting on the "outside" is not good I see the kit fixed that, glad to hear it. That is great mileage for that yr vehicle. I would have expected around 10-12.

                      Black wolf thats a cool example of the different circuits, seems I've seen that somewhere before. Could it have been school....ha ha. I've forgot alot in 25 yrs

                      JROC I agree with you, I work on both and both gas and diesel have their place. The gas engines are mostly Chevrolet and we have lots of them with over 200K on them. The Fords seem to do just as well. . We've often joked in the shop, we could replace a 5.7 gas engine for the cost of a set of injectors in a 6.0 diesel. But the 6.0 is a good runner when everything is right. Still hearing more rumors from our fleet people on a CAT/ Ford thing. That would be great. Good luck with your truck, I bet it makes it untill you retire
                      Last edited by HMW; 10-01-2007, 01:48 PM. Reason: spelling

                      Comment


                      • #56
                        how about some cab mounts now.....i have checked with parts houses here locally and nope, dont have 'em is all i get. the cab mounts are completely shot and would like to replace them. anyone have an idea where to start?

                        Comment


                        • #57
                          I have bought a couple things from this place, ford stuff but they have chevy stuff too. Also JC Whitney has alot of stuff. lately though my local Chevy dealer has given me great prices.

                          http://www.lmctruck.com/index.htm

                          http://www.lmctruck.com/icatalog/cc/0053.asp

                          Good luck, still running good??

                          Comment


                          • #58
                            hmw, thanks for the link. i will definately give 'em a try. i am going to have to put a check ball in the fuel line. after a couple days of sitting around, it takes a minute to pick up fuel. i bought an in-line fuel filter once before that had a built in check ball. its time to start remembering all the stuff i "used to know"

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                            • #59
                              Sounds more like the choke isn't working right, just a guess though. Have never had to put a check in a fuel line before that i remember. I'd have to check on it but I think some fuel pumps have it built in. Also the only filter that was in the Q-jets was the one right at the carb. That is if my memory is right and I'm not thinking of something else. Its been along time since I worked on one. Everything I work on now is fuel injected gas/diesel. The float bowl should still be full even after a couple of days. That would be enough to start I would think. Does it start easy then quit?? You can operate the accelarator pump by hand to see if its really "out of fuel" after it quits.
                              Just givining you some stuff to think about, good luck

                              Comment


                              • #60
                                Quadrajunks are known to let the fuel leak down into the intake manifold when sitting for a day or two. Check the needle and seat and also check for a cracked float, that is also known to happen quite often. Dave

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