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WQ59B · 10-15-2017, 08:09 PM

REVIVAL ::
Have a rebuilt 91-99 Ford carb on a stock 59AB flathead/intake. Truck starts, idles & runs well, but have whistling vacuum leak.

3 times now have started the truck cold & timed it. Parked, it takes about 7 minutes for the truck to warm to the point the carb starts whistling, and it's quite noticeable. Wiper port is plugged.

Once the upside-down bolt was loose, turned out the threads there were partially stripped. Epoxied in a stud and used a nut. Checked all surfaces, all gaskets, replaced bottom one twice with new, sprayed exterior with carb cleaner along all seams (no effect), rocked carb by hand (tight- no effect), checked all screws... cannot find the source. If I rev the engine after the whistle starts, it's still there.

Seems logical the whistling is triggered by the heat once it warms up. Why/ where/ how? Prior to that the cab base was sweating & very cool while running. Would a phenolic spacer be prudent?

10-15-2017, 08:09 PM	#23
WQ59B Member Join Date: May 2014 Location: NJ Posts: 69	Re: Loud Whistle From 94 Carburetor REVIVAL :: Have a rebuilt 91-99 Ford carb on a stock 59AB flathead/intake. Truck starts, idles & runs well, but have whistling vacuum leak. 3 times now have started the truck cold & timed it. Parked, it takes about 7 minutes for the truck to warm to the point the carb starts whistling, and it's quite noticeable. Wiper port is plugged. Once the upside-down bolt was loose, turned out the threads there were partially stripped. Epoxied in a stud and used a nut. Checked all surfaces, all gaskets, replaced bottom one twice with new, sprayed exterior with carb cleaner along all seams (no effect), rocked carb by hand (tight- no effect), checked all screws... cannot find the source. If I rev the engine after the whistle starts, it's still there. Seems logical the whistling is triggered by the heat once it warms up. Why/ where/ how? Prior to that the cab base was sweating & very cool while running. Would a phenolic spacer be prudent?