300 Loose carb
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New User
Joined: Feb 2003
Posts: 10
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300 Loose carb
The carb on my '86 F-150 300 is a little loose but I can't seem to tighten it. I know other guys have run into this before and I hope someone can help. Is there more that two bolts that hold the carb down? The two I could find through the mess of vacuum hoses and wires on this emmision pig didn't help. I know I'm missing something basic and dumb. Maybe I'm not even tighting the corret bolts/nuts, are am I just missing one or two? Maybe I need to break down and buy a Chilton's at Autozone
thanks
thanks
Elder User
Joined: Dec 2002
Posts: 925
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From: Quaker Hill ,CT U.S.A.
300 Loose carb
try pulling the carb off ..now you know where the two bolts that attach it to the intake manifold...look at the trottle plate and all the little small screws that attach the plate to the carb housing ..try tighteniing them..my friends 1980 would do the same thingyours is ..I ended up loc titeing them..you should replace the base gasket also at this time ( the gasket inbetween the carb and the intake/egr valve..by the way welcome to FTE
Post Fiend
Joined: Nov 2002
Posts: 9,987
Likes: 7
From: Memphis, TN
300 Loose carb
The 2-stud mounting of the 300's 1-bbl carb is a know problem. If the nuts aren't torqued right, the carb rocks, ruining the gasket, and creating vacuum leaks. To fix it, you have to replace the gasket and torque the carb down right. A Haynes manual gives the specs, but you might also find them here.
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New User
Joined: Feb 2003
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300 Loose carb
Thanks for the welcome and the help. I found an exploded view picture of the carb online and realized I was tightening the correct bolts that hold the carb down but that the bolts that hold the bottom plate of the carb to the main body are loose. I'm just going get a $13 carb kit from Autozone and rebuild it while I have it off. Good call on the top star screws, each were loose.
