Good day all, new here. Great responses to all issues!
I have a in line 6, 300 76 f-150,176000 MILES, SSI, 3 on the tree, man steer, power boost brakes....
Idles poorly, will run if i keep idle up at 900-1000, with a vibration. will stall coming to a stop. starts ok cold. I HAVE REPLACED plugs, wires,coil, cap,
button, all filters fuel(at carb) air, oil, sprayed cleaned carb, ran 2 tanks w/lucas fuel treatment, still runs rough.
not sure on carb, heater valve in exhaust, or valve adj

Looks like a carb / rebuild is next !?

any thoughts?
thanks

 

Might want to check for vaccume leaks. Probably a pretty large one.

 

thanks, I also set timing on 6 deg btdc, no data plate on this truck. only could go by earlyer years,same engie. no one has been able to "look up the specs"

 

You can take a can of carb. cleaner and spray around the carb. base, intake, and vaccume lines while it's ideling and listen for it to pick up. If it does then you've found a leak.

 

I did spray around lines, carb base...BUT NOT INTAKE, thanks!! idle did change at intake.
I changed both in/exh gaskets 1 1/2 year / 5000 mile ago

 

I snugged all bolts on intake, BETTER, should I have used something on gasket set? I put the on "dry"

 

You don't want to use any kind of sealer on intake runner gaskets, you should install them dry.

 

The 300-6 didn't use exaust manifold gaskets originally. Only an intake gasket. The exaust manifold to head should be metal to metal.

There are aftemarket gaskets that have a exaust manifold gasket built into the intake gasket. Using these types of gaskets will increase the gap between the intake manifold and the head which can cause potential leaks.

If you use the aftermarket intake/exaust manifold gasket, you need to seperate the intake and exaust manifold from each other, then realign them for the new type gasket.

 

This weekend I am going to tear down the old girl again,
looking for the leak. best to go- no go with a gasket?

she is better but still will stall / stumble coming to a quick stop / more so if DOWNHILL. carb float??
never have rebuilt this one - or any for that matter, simple one i hope, or replace with reman / new. any thoughs guys?
thanks.

 

The Carter Motorcraft YF carb is the simplist carb to rebuild. You can take it apart and rebuild it in about two hours. Just make sure you take the time to clean the carb. This can take longer than two hours depending on how dirty.


As for the intake gasket, you should use the intake gasket that came stock with it. The one without the exaust manifold gasket.

 

and if you have time do the "Chem Dip". do this over night or for several hours. that will get rid of all of the stuff that ain't supposed to be on the carb. most carbs will come out looking almost brand new......at least mine did.

 

Thanks Guys, Let You Know If The Spirt Of 76 Lives!!
Need To Get Some Pics Posted, Nice Red White & Blue.

 

Well I found my AROUND2IT, carb clean and with the FLOAT turned upsidedown ( the way it shows in several pics ! ) she LIVES. NO MORE stalling at a stop, idles good, 17" vac and steady. better pick-up, I need to adjust choke a bit but all seam fine.
THANKS to all the input!! looking for tune-up details, NO engine decal to go by. will start a new post on this.

 

posted some pics of my girl.
thanks for all the help, RUNNING GOOOOD !!!
wayne