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My Rochester is Whistling!

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Old 07-15-2008, 11:19 PM
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My Rochester is Whistling!

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!
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Old 07-16-2008, 07:05 PM
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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
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Old 07-16-2008, 08:52 PM
Kazoo Kazoo is offline
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Didja check the oil level in the air cleaner?? Whatever is whistling could be suckin the oil out, maybe thats why it came back.
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Old 09-06-2008, 04:55 PM
WerbyFord WerbyFord is offline
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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.
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Old 09-06-2008, 10:38 PM
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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.
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