Probably something simple.

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That last statement just triggered (in my mind anyway), the need to flood some lube in the flywheel on the forward side to see if the sound changes----
Put a pan underneath so you don't have a mess---

I would be really interested if anyone has ever done vibration testing on a stock engine, either with the tranny connected or not-would be some good info to know, and help immensely in troubleshooting questions such as this one.
 
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Ok here's what we used to do @ the dealership when we could not find where the noises were coming from. Get yourself a piece of heater hose long enuff so you can put up to your ear & be able move the other end around specific spots on the engine to help locate where the noise originates. I'd especially look around the intake seeing you confirmed you have a vaccum leak. Be sure to check under it too.
 
Same Idea. I think a stethiscope would detect more internal noises like knocks, taps, whirring bearing noises, & such. W/the hose the noise will get louder the closer you get to it. It's worth a shot. You mention previously you could not find anything w/a stethiscope, but the noise is still there.
 
The stethoscope hears vibration/grinding/rattling when the stethoscope touches the noise producer.

A piece of 5/16" fuel hose will allow localizing a hissing/shrieking/whistling sound.

Do remove the belts and run the engine for 30 seconds before going any farther.
 
Okay got back from school pulled the belts off and noise is still there, looked at the starter and it disengages all the way.
 
my money is on that carb. i read a thread awhile ago that someone had a whistling sound, real loud. and it wound up being the weber carb. do you have another carb to test? the noise doesnt happen right away right? thats what it seemed like in the video anyway.
 
kruisinkid said:
my money is on that carb. i read a thread awhile ago that someone had a whistling sound, real loud. and it wound up being the weber carb. do you have another carb to test? the noise doesnt happen right away right? thats what it seemed like in the video anyway.
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It slowly got worse and worse but now the sound happens immediately after startup, you can hear it suckin air. The Weber sounded the same on the old one. Don't have another carb. just this one.
 
kruisinkid said:
my money is on that carb. i read a thread awhile ago that someone had a whistling sound, real loud. and it wound up being the weber carb. do you have another carb to test? the noise doesnt happen right away right? thats what it seemed like in the video anyway.
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i have a whistle on my 60's weber under certain conditions, but it's just that, a whistle that sounds like a whistle. i would be surprised if this entire noise is a vacuum leak(s).
 
Even with all the experts here talking about carb/vacuum, I still think it's metal sounding. A squirt of oil in the forward flywheel area may tell you some things--if there is no change, then proceed with the vacuum investigation--at least it may eliminate the mechanical-
 
I guess I should explain further I heard the carb sucking air through the butterfly valve openings, where it should be. As in ,NOT in a major crack in the manifold or the carb.

Flywheel check will come tomorrow, hoping thats it.
 
Dumb question but you did change the oil or put fresh oil in it before initial startup correct? As mentioned earlier have you drained and checked oil lately? Does it look and smell ok? I have never heard a noise like that coming from vacuum leak. Keep in mind it would not be running as smoothly as it is if there was such a problem with vac or carb. I wouldn't run it again until you're 100% sure there's no mechanical issue or you'll ruin it. just another 2 cents fwiw. good luck.
 
terrx said:
Dumb question but you did change the oil or put fresh oil in it before initial startup correct? As mentioned earlier have you drained and checked oil lately? Does it look and smell ok? I have never heard a noise like that coming from vacuum leak. Keep in mind it would not be running as smoothly as it is if there was such a problem with vac or carb. I wouldn't run it again until you're 100% sure there's no mechanical issue or you'll ruin it. just another 2 cents fwiw. good luck.
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They ship it without oil, put a new gasket set on, so new oil pan, water pump, head gasket etc. topped off with marvel mystery oil, haven't drained it yet because It takes like 8 quarts bone dry.
 
I was gonna make a vid for cruiserparts and then that flywheel test before i empty the oil. Its started up just peachy about 4 or 5 more times since the vid. but then again these engines like to chug away even with close to a quart of sand in them.
 
WIP77FJ said:
They ship it without oil, put a new gasket set on, so new oil pan, water pump, head gasket etc. topped off with marvel mystery oil, haven't drained it yet because It takes like 8 quarts bone dry.
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I wouldn't necessarily change it again but drain enough into a clean container that you can check it out. If it's ok then no reason not to put it back in. Even a quick look at oil on the dipstick if that's all you can do.
 
terrx said:
I wouldn't necessarily change it again but drain enough into a clean container that you can check it out. If it's ok then no reason not to put it back in. Even a quick look at oil on the dipstick if that's all you can do.
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Just looked at the dipstick oil looks perfect, although it has been sitting for a few hours. Guess I can always like you said, drain some out then pour it back in, tomorrow.
 
Sprayed down the flywheel with good ole wd-40 the pitch went up. Then it sat for about 10 min and upon start-up noise was almost completely gone, taking off the flywheel now.
 
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