Humming noise from the back

nico13

nico13

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Hi who can help

I have a humming noise from the back above 80 Km/h (50ml). I cant figure out where it is coming from (dif, bearings or prop shaft)?
Has any body had the same experience?

Best regards,
Nico
 
My theory is that's when the play in the bearings really presents itself and is rotating enough to make noise.
 
Ok someone told me that I need to disconnect the shaft from the dif. to be sure that it is the bearings and not the dif or the bearing of the shaft?
Nico
 
Jack up the car. Simple test is if there is any movement or play in the rear wheel when rocking it side to side or up and down with your hands, the bearings are bad. To replace the bearings the half shaft needs to me removed. I leave the repair to professionals who have the correct tools for the job.
 
adawil2002 said:
Jack up the car. Simple test is if there is any movement or play in the rear wheel when rocking it side to side or up and down with your hands, the bearings are bad. To replace the bearings the half shaft needs to me removed. I leave the repair to professionals who have the correct tools for the job.
Click to expand...

I'll be the first to admit that it's a PITA to remove the half shafts. Especially if you forgot to loosen the bolts before removing the rear axle assembly! :D

My half shaft removal has been stalled for two weeks. I've been meaning to pickup a larger cheater pipe from Home Depot.

Meanwhile, I saw this on the big bang theory the other day and had a good chuckle:
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I have a humming noise from the back above 80 Km/h (50ml)
Click to expand...

While the reported symptom may indeed be wheel bearings, there are other possibilities to consider. Loose lug nuts and or half shaft fasteners can make some interesting sounds, especially at speed. Same with certain tire treads. And if you have a perished exhaust hanger (or two), permitting part of the exhaust to contact the chassis, this can also result in unusual harmonics. Of course, fuel pumps have been known to "hum," and this may be a primary reason they are typically mounted using rubber isolators. However, if the pump were to contact the chassis, humming would likely be heard in the cabin - but it is unlikely to be speed sensitive. Other possibilities might include loose/unstowed items in the boot and even loose rear shock mounts. although these things tend to announce their presence on uneven surfaces or while taking corners. Finally, low lubricant level in the differential can result in a howling noise, as can worn spider gears in an open differential.
 
Thanks for all the advices, it is not some loose item it is clearly coming from a rotating item.
The sound is constant (above 80) and is of the same frequency at higher speeds.
Because my car is a 3 speed automatic I was thinking of the shaft bearing or dif!
I will start with simple jacking up and feel if there is some movements or play in the wheels.
 
I figured that was the bearing, unless you meant your CV's (which don't usually hum in my experience). My drive-line goes nuts at about 40mph, and I figured it was the guibo or the center bearing. I haven't investigated. No humming...
 
My car is making the same noise as yours only at 50 mph. I had a look and the UNIVERSAL JOINT is not good any more (cracks in the rubber) also I notice a bang after putting the automatic gear in the reverse so I will need to inspect the compleet drive shaft and may replace the joint, bearing and support bearing. I hope the joints are still ok otherwise it will be a compleet restoration of the drive shaft.:(
 
Dear Steve M5 guido is that for an automatic gearbox or is it universal to be used?
What will be the difference and what stand the M5 for?
A lot of questions for 1 advice :D
 
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