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Sun Apr 15, 2012 4:06 pm

Hey guys! so on monday i got into my 74 Bug 1600dp stock, and when i fired it up it had this whinning noise, and it has been driving me nuts! its not the belt that i can tell, it almost sounds like the alternator fan needs some wd40 here is a video, Does anyone know what that is? Its always while your driving, but i cant tell if it goes away while accelerating or the car revving covers it up, thanks a ton
AJ
here is the youtube link.

Sun Apr 15, 2012 4:21 pm

Take the fan belt off and run it for a minute or two and see if it goes away. If it doesn't then it's the fan or alternator.

Only run it when cold and for a minute or tow since the fan won't be cooling it.

Sun Apr 15, 2012 4:28 pm

Glenn wrote: Take the fan belt off and run it for a minute or two and see if it goes away. If it doesn't then it's the fan or alternator.

Only run it when cold and for a minute or tow since the fan won't be cooling it.

ok i will and ill get back to you! Thanks again Glenn

Sun Apr 15, 2012 4:32 pm

Pull down on the fan shroud or on the front of the generator. I had a noise like that coming from my engine and it was the loose fan shroud causing some rubbing.

Sun Apr 15, 2012 4:57 pm

Glenn wrote: Take the fan belt off and run it for a minute or two and see if it goes away. If it doesn't then it's the fan or alternator.

Only run it when cold and for a minute or tow since the fan won't be cooling it.
Glenn, i just pulled off the belt and it still does it? that made no difference, any other ideas?

Sun Apr 15, 2012 6:11 pm

Remove the air cleaner and see if it goes away. Try putting your hand partially over the carb. It seems to go away when you rev it.

Could be a bearing noise, which would be bad.

Sun Apr 15, 2012 6:27 pm

I hear that high-pitched whine drop slightly when he blips the throttle.

Could it be vacuum related?

Max

Sun Apr 15, 2012 7:45 pm

Glenn wrote: Remove the air cleaner and see if it goes away. Try putting your hand partially over the carb. It seems to go away when you rev it.

Could be a bearing noise, which would be bad.
Ok i will try those and do a little more troubleshooting. If.its a bearing, what kind of bearing? Throwout bearing or a internal engine bearing? It started out of nowhere and i hope its simple! Thanks again

Mon Apr 16, 2012 9:05 am

Glenn wrote: Remove the air cleaner and see if it goes away. Try putting your hand partially over the carb. It seems to go away when you rev it.

Could be a bearing noise, which would be bad.

Another piece of info, I put on a new exhaust last weekend, and it started after that, i didnt change anything else just put on a new exhaust. idont know if that would have anything to do with it but im not sure. thanks again for any help

Mon Apr 16, 2012 1:45 pm

A bug I had way back when whined when it had sucked a tee shirt into the fan when no one was watching.

Mon Apr 16, 2012 2:00 pm

DeathTrap wrote: A bug I had way back when whined when it had sucked a tee shirt into the fan when no one was watching.
Haha! well i hope its something that easy and not a big engine issue! haha! Thats great! thanks for the laugh!

Sun Apr 22, 2012 6:12 pm

Glenn wrote: Remove the air cleaner and see if it goes away. Try putting your hand partially over the carb. It seems to go away when you rev it.

Could be a bearing noise, which would be bad.
ok glenn update.
I drove it this week with the annoying sound, but it runs fine, i have same power/acceleration. I the noise goes away when i step on the gas, when i am cruising with my foot on the accelorator it goes away, its only when im idling or let off the gas to slow or whatnot it comes back, i just pulled the air cleaner off and it still does it
It is coming from the drivers side rear of the engine almost sounds like its coming from the Oil cooler area. when i put my head under the car you can hear it but not as much, but when i put my ear by the ds rear it is loud. the passenger side you cant hear it as much, it is the weirdest thing!
Again any ideas would be great. the only thing i changed on my car from when it didnt make that noise to it making that noise is i changed my exhaust. its like a loud rubbing noise, it takes it a second to start making the noise when i start the car but once its running it starts right up. it feels the same, just is loud and super annoying and i dont want to break something by driving it if i shouldnt, i hope its an easy thing. i shook the fan shroud and nothing.
Thanks again

Sun Apr 22, 2012 8:20 pm

Maybe it could be coming from your dizzy. The faster you go the faster it spins, maybe something is rubbing or out of balance.

Sun Apr 22, 2012 8:33 pm

scratchs68 wrote: Maybe it could be coming from your dizzy. The faster you go the faster it spins, maybe something is rubbing or out of balance.
what is a dizzy?

Mon Apr 23, 2012 6:22 am

It's not a "DIZZY"!!! It's a distributor.

Mon Apr 23, 2012 7:53 am

drs1023 wrote: It's not a "DIZZY"!!! It's a distributor.
OH haha! i was wondering what that meant haha!

Mon Apr 23, 2012 4:01 pm

I agree with vacuum issue. The sound drops with throttle.

Mon Apr 23, 2012 4:39 pm

I had a similar noise in my SB, turned out the engine tin was rubbing on the back of the crank pulley. Easy fix, but it was driving me nuts 'till I found it.

Mon Apr 23, 2012 7:09 pm

Hard to tell if its a mechanical or vacuum sound, but it kinda sounds like a dry distributor cam? (where the points block rides)

Wiggle around your vac lines.

Or heres a crazy thought....a little piece of gasket in your newly installed exhaust whistling? Or a small gasket leak causing the whistle?

Tue Apr 24, 2012 10:47 am

high pitch
and very loud to boot.

there are 2 easy ways ( fan belt is first and done , removed)
a rubber hose to the ear lets you find the source. near free.
a stethoscope for $5 at HF will do so too.

start with the hose and listen all over, you will find the source.
top , bottom, left right, front ,rear.

sounds like air/exh leak to me. but , im not there.
surely the hose trick to ear at a 4 exh ports. is in order.
if stock exh, lots of places on exh. to leak.
even riser ports.

tricks , run with out air cleaner
or those 3 paper air tubes pulled off.
oil PCV beather hoses pulled.
make sure disty rotor not wrong for motor (some have huge bottom hole
and is dead wrong or not seated all the way down)
look under disty cap for rotor wear marks under cab (bad)

nice vid. way to GO THERE.