rcarlisle Posted January 24, 2022 Share Posted January 24, 2022 Edit: IF you are here for choke adjustments - read on down. Or read from the end back. See photo. Truck has been weird lately. Would idle at 2500. Ugh! Sometimes I could manually push the throttle closed and get good idle. Yesterday, I was messing and went up interstate at 70 just fine. Pulled off and it was idling at 2500 and sounds like the fan hitting the shroud. Pulled off at a church and raised the hood. Ping ping ping and motor running like crap on a white rag. Vacuum all over the place, missing. Figured I'd try the 3 miles to home and either limp or be closer for the tow truck if she blew up. Checked oil, a little low. Added some, let it sit. Started it again, quiet as a mouse. Grrerr. Went to try it again today after replacing a 6 months old Sylvania headlight (!!!). Throttle was stuck weird. I said some bad words and figured may as well remove the carb. See photos. I guess I know what the pinging was. And probably the rest of the issues. Do I fix it? With lots of thread locker on the new screws? The one still in is bent. Still got to inspect the butterfly disc to see if it is bent or not. Link to comment Share on other sites More sharing options...
Gary Lewis Posted January 24, 2022 Share Posted January 24, 2022 So how many of the throttle plate screws are missing? And they weren't either staked or Loctited in? Man, that is a serious error. I think I'd replace the screws and ensure the throttle will close cleanly. That can sometimes be a problem to get just right and takes me trial and error. But if that's all that it takes to make the carb work right again, it would be a cheap fix. Link to comment Share on other sites More sharing options...
rcarlisle Posted January 24, 2022 Author Share Posted January 24, 2022 So how many of the throttle plate screws are missing? And they weren't either staked or Loctited in? Man, that is a serious error. I think I'd replace the screws and ensure the throttle will close cleanly. That can sometimes be a problem to get just right and takes me trial and error. But if that's all that it takes to make the carb work right again, it would be a cheap fix. Thanks. Only one screw missing. Other is loose on one side. The other side seems secure. Screwdriver wants to cam out of the screwhead. I'm kinda leaning that way since we had to put a roof on house recently and we are basically cashless for a while. Maybe some hex heads? And loctite. But I will be making certain all fasteners are secure before I reinstall. Link to comment Share on other sites More sharing options...
Gary Lewis Posted January 24, 2022 Share Posted January 24, 2022 Thanks. Only one screw missing. Other is loose on one side. The other side seems secure. Screwdriver wants to cam out of the screwhead. I'm kinda leaning that way since we had to put a roof on house recently and we are basically cashless for a while. Maybe some hex heads? And loctite. But I will be making certain all fasteners are secure before I reinstall. Hex heads are usually hardened. But normally brass screws are used for the off chance that they come out and down into the engine. Link to comment Share on other sites More sharing options...
rcarlisle Posted January 25, 2022 Author Share Posted January 25, 2022 Hex heads are usually hardened. But normally brass screws are used for the off chance that they come out and down into the engine. Good point. I'm hoping that crappy little screw went on through the system and out the tail pipe. I know what it sounds like in the engine, though. It's not pleasant. These look like the crappy gold plated steel screws that China is famous for. Not real brass. I'll look at them more tomorrow. Link to comment Share on other sites More sharing options...
85lebaront2 Posted January 25, 2022 Share Posted January 25, 2022 Good point. I'm hoping that crappy little screw went on through the system and out the tail pipe. I know what it sounds like in the engine, though. It's not pleasant. These look like the crappy gold plated steel screws that China is famous for. Not real brass. I'll look at them more tomorrow. Best Chinesium metal, about the strength of solder. They are probably metric thread. Use red Loctite when you put new ones in. On setting the plates. Remove the fast idle lever on the choke side, back the slow idle all the way off. Install the throttle plates just snug and hold the throttle fully closed. Tighten the screws, look through the bottom and make sure they are even. Then one at a time take them out and put Loctite on them and re tighten. Link to comment Share on other sites More sharing options...
mat in tn Posted January 25, 2022 Share Posted January 25, 2022 Best Chinesium metal, about the strength of solder. They are probably metric thread. Use red Loctite when you put new ones in. On setting the plates. Remove the fast idle lever on the choke side, back the slow idle all the way off. Install the throttle plates just snug and hold the throttle fully closed. Tighten the screws, look through the bottom and make sure they are even. Then one at a time take them out and put Loctite on them and re tighten. do the screws go all the way through where they can be pinched with vise grips? maybe replace them with longer ones so they can be Link to comment Share on other sites More sharing options...
rcarlisle Posted January 25, 2022 Author Share Posted January 25, 2022 Best Chinesium metal, about the strength of solder. They are probably metric thread. Use red Loctite when you put new ones in. On setting the plates. Remove the fast idle lever on the choke side, back the slow idle all the way off. Install the throttle plates just snug and hold the throttle fully closed. Tighten the screws, look through the bottom and make sure they are even. Then one at a time take them out and put Loctite on them and re tighten. Thanks. Good advice. I'll be studying both of theses suggestions. The pinging as that screw went through the engine was not fun. Link to comment Share on other sites More sharing options...
mat in tn Posted January 25, 2022 Share Posted January 25, 2022 Thanks. Good advice. I'll be studying both of theses suggestions. The pinging as that screw went through the engine was not fun. all you can do is hope for the best. it may be imbedded in the top of a piston, or it may have gotten spit out. if damage got done it may tell you soon enough. it's a sickening feeling for sure even wondering. and it's not even my engine. this is why you see my builds with intake's taped up while no carb is installed. Link to comment Share on other sites More sharing options...
rcarlisle Posted January 25, 2022 Author Share Posted January 25, 2022 all you can do is hope for the best. it may be imbedded in the top of a piston, or it may have gotten spit out. if damage got done it may tell you soon enough. it's a sickening feeling for sure even wondering. and it's not even my engine. this is why you see my builds with intake's taped up while no carb is installed. When I restarted the truck, it ran smoothly again. Vacuum was steady again. Hoping the screw went on out thru the exhaust system. But yes valuable lesson learned. Link to comment Share on other sites More sharing options...
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