1985 Jayco, Ford 460 carburetor help

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1985 Jayco, Ford 460 carburetor help

Home > Discussion Forum > Mechanic's Corner (general)

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All Messages in Thread	Author	Date
1985 Jayco, Ford 460 carburetor help	Alan Andrews	11-1-09
Can someone please advise: I know a but about mechanics but not been in the trade for years: I'm just replacing the accelerator pump diagphragm on the carb (Motorcraft 4 barrel) I notice the two rear barrels on the engine base have some kind of tarnish or carbon build up in the barrels and I heard that it might only be using 2 barrels?? Now I was a mecahnic in the coal mines for year but I'm not auto guy. Can this or does this make sense? Its an older RV and I plan to takre her cross country, 1985 with 43K and I've driven her about 1000 miles. The RV runs pretty good albeit 5mpg as expected. I know I was losing gas on the perished diagphragm. If the old girl starts to become too much of a $$$ investment (I paid $2600) then sorry she's going to the knackers yard so I'm hoping to limit the amount I put into it. Does the build up in the rear two barrels indicate any serious threat? I am replacing the vacuum hoses etc. Hoping not to do a rebuild if the bus runs. 5mpg is already budgeted in my expense. Thanks for your time folks Cheers Alan
Re: 1985 Jayco, Ford 460 carburetor help	Phil Feinstein	11-3-09
Hey Alan! What you're describing is "varnish" and pretty common in old carbs. It's a sign of cheap gas and/or running slightly rich. It isn't necessarily a problem, but it could indicate a vacuum leak if the secondaries are opened with a vacuum diaphragm instead of a linkage. Once you get the hoses replaced, you'd be doing yourself a favor if you'd check for vacuum leaks with a can of Gumout while the engine is running. If there aren't any leaks, you don't need to worry about a rebuild. If your carb is sitting on a bakalite spacer it is pretty typical for the gasket above and below to leak after a few years, but this is pretty easy to find and doesn't call for a rebuild. If you find a leak in the air horn (the top plate of the carb) and main body this means a rebuild. Hope that helps!

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