My Rochester is Whistling!

e-tek · #1 (**permalink**) 07-15-2008, 10:19 PM

I thought I had fixed a LOUD whistle (Vacuum leak) coming from my rebuilt Rochester in my '46 Merc (Flathead 8). It went away when I replaced and filled the Air Cleaner's Oil bath - for about a week, but now it's back.
It's a vacuum leak of some sort but I couldn't find it with a tube and trying to cover different areas, plus, I sprayed starter fluid around it but no idle changes....
Anyone heard this before or have any ideas on how better to pinpoint the leak? Thx!

effie_man · #2 (**permalink**) 07-16-2008, 06:05 PM

i refer to what i wrote in you other post in Man/sask forum . welcome to the flathead section where all the gods live lol

Kazoo · #3 (**permalink**) 07-16-2008, 07:52 PM

Didja check the oil level in the air cleaner?? Whatever is whistling could be suckin the oil out, maybe thats why it came back.

WerbyFord · #4 (**permalink**) 09-06-2008, 03:55 PM

I've had the Whistle numerous times, it has always been a bad seal at the carb base gasket to the intake. It will run ok, just whistle. If it was any worse it would behave like a vacuum leak. It was worst on one carb I had with a warped base, I'd just put up with it. Change base gaskets and check that the gasket covers everything fully, that is my bet.

e-tek · #5 (**permalink**) 09-06-2008, 09:38 PM

Thanks guys. I drive this truck several times a week and hadn't heard it until just today again - most of summer nothing. I'm gonna check for leaks again and add a gasket to see if that works.