Low frequency whining/whistling noise

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Low frequency whining/whistling noise

Post by jwolters on Thu Jun 27, 2013 11:14 am

Dear all,

I just bought a Hijet from 1997. I found out today that when I've been driving for around 15 min on the highway (50 mph), a low/mid freq whining/whistling noise appears, which is kinda intermittent. could it be something with the axle? When I press the clutch the sound does not change.

Regards,

Joris.
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Re: Low frequency whining/whistling noise

Post by leopard_pagan on Thu Jun 27, 2013 2:29 pm

noisy prop-shaft/drive-shaft.
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Re: Low frequency whining/whistling noise

Post by rich the mechanic on Thu Jun 27, 2013 9:18 pm

tyre balance can cause a noise so can tyre pressure and beaing condition, could also be a door not adjusted properly or it could be something loose quite often you see and hear modern cars with there plastic under trays flapping about making a noise could be some thing like the metal engine deflector has come loose.
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Re: Low frequency whining/whistling noise

Post by jwolters on Thu Jun 27, 2013 10:21 pm

hmm, im thinking it has more to do with the axle. I made two 35 min drives, on the first the noise was there most of the time, with interuptions of like a minute. on the second drive I did not hear it at all. Havent found any flapping part (will check tomorrow by light more thoroughly), and the noise is also there at lower speeds, though it very much comes and goes.
Bearings could also be, previous owner changed bearings frontleft, maybe now other side is worn down...

any tips for what to check and how?
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Re: Low frequency whining/whistling noise

Post by HighlyJetted on Thu Jun 27, 2013 11:02 pm

Diffs quite often make a drone related to load, for example.

Once you get up to speed, say 60kmh, then gently lift off the throttle a bit, if the droning gets louder its the diff.
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Re: Low frequency whining/whistling noise

Post by jwolters on Mon Jul 01, 2013 1:05 pm

on the last drive, i tried the throttle tip, but that did not have an effect.
last weekend the noise appeared a few times during a long drive. It appears to be dependent on the steering angle. Changing the steering wheel angle slightly makes the sound dissappear. someone told me that if it is the bearings, the sound should be pronounced when driving through corners, but this is not the case. It only appears now and then when driving straight, mostly at higher speeds, although i've had it at low (10mph) speeds as well. It almost sounds as if a turning element is scraping against something else...
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