1986F150Six Posted March 20 Share Posted March 20 I have owned 3 vehicles with the 300/4.9L carbureted engines and all had the carburetor held down with two nuts. My son's 1984 is the same and I wondered why a lock washer is not used? Thoughts? Thanks! Link to comment Share on other sites More sharing options...
85lebaront2 Posted March 20 Share Posted March 20 I never saw a problem there, the issue I always saw was the throttle body to float bowl/main body screws coming loose. Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted March 20 Share Posted March 20 Lock washers are next to useless. If you're really concerned use distorted prevailing torque lock nuts. They will not come loose. Link to comment Share on other sites More sharing options...
Tarheel Blue Posted March 20 Share Posted March 20 I’ve run my YFA w/ star washers for over 15 years now. None of the traditional “wobbling loose” problems, ever. Link to comment Share on other sites More sharing options...
1986F150Six Posted March 22 Author Share Posted March 22 I’ve run my YFA w/ star washers for over 15 years now. None of the traditional “wobbling loose” problems, ever. Thanks, that was what I was hoping! Link to comment Share on other sites More sharing options...
FuzzFace2 Posted March 23 Share Posted March 23 I never saw a problem there, the issue I always saw was the throttle body to float bowl/main body screws coming loose. Yep that is where I have seen them come loose also not the carb to intake manifold. Dave ---- Link to comment Share on other sites More sharing options...
85lebaront2 Posted March 23 Share Posted March 23 I never saw a problem there, the issue I always saw was the throttle body to float bowl/main body screws coming loose. Yep that is where I have seen them come loose also not the carb to intake manifold. Dave ---- Dave, now you know why every YF/YFA I rebuilt had those loctited. Link to comment Share on other sites More sharing options...
Ford F834 Posted March 23 Share Posted March 23 David, I don’t have a technical answer but I have a theory… When you go to remove the carburetor, the nuts don’t suddenly “crack” loose… they release gradually and evenly. I assume this is due to the very fine threads combined with some rebound on the compressed gasket material. Also the carburetor flange is soft metal so the nuts seem to bite into it just a little… like I said, it isn’t a scientific engineering answer, just an observation. I have never had one come loose at the mounting studs, but I have had the bowl come loose from the base plate! Link to comment Share on other sites More sharing options...
1986F150Six Posted March 26 Author Share Posted March 26 David, I don’t have a technical answer but I have a theory… When you go to remove the carburetor, the nuts don’t suddenly “crack” loose… they release gradually and evenly. I assume this is due to the very fine threads combined with some rebound on the compressed gasket material. Also the carburetor flange is soft metal so the nuts seem to bite into it just a little… like I said, it isn’t a scientific engineering answer, just an observation. I have never had one come loose at the mounting studs, but I have had the bowl come loose from the base plate! Thanks, Jonathan! Link to comment Share on other sites More sharing options...
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