Posted: Sun Apr 15, 2012 4:06 pm Post subject: Engine Whining Noise
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.
Joined: December 25, 2001 Posts: 55674 Location: Long Island, New York, USA
Posted: Sun Apr 15, 2012 4:21 pm Post subject:
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 74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine "You may not get what you pay for, but you always pay for what you get"
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www.DasVolks.com Long Island's Aircooled Club
Joined: December 05, 2011 Posts: 140 Location: Damascus Oregon
Posted: Sun Apr 15, 2012 4:32 pm Post subject:
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.
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
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
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
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.
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)
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