help front end metallic hum

[fireman717]

Well I have noticed a hum type sound coming from my left front tire area. It is more pronounced when vehicle has been run harder. Not as noticable when cold or under 10 mph. Brakes seem good tires rotated and still makes sound. Need help and guidence please.

 

[Slow Six]

2 wheel drive or 4X4?

 

[fireman717]

4 wheel drive

 

[JApol]

I had the same thing on my truck but I never noticed the hum till it was gone.

Have that hub checked out ASAP. If the hub is and and you keep driving the truck that hub will eventually take out your abs sensor.

 

[TBartlett1]

Sounds like a front wheel bearing.

To determine which side perform the following procedure;

Drive down a smooth road (no traffic) swerving from right to left several times, this will load and unload the bearing which will cause the bearing to buzz as it is loaded.

As you swerve to the right the left front wheel bearing is loaded and will start to buzz if defective and will stop as you straighten and turn left.



Do this at various speeds until you determine which side is bad.

Typically a bearing that is starting to fail will not feel loose when jacked up.

I live in the NE and when I replace a unit wheel bearing I apply grease liberally to the back of the bearing that sets against the stub axle. The purpose is to keep water from entering the bearing from road splash.

Having replaced dozens of wheel bearing I have noticed that the bearing usually fails because water enters thru the back of the bearing, slathering this area with grease provides a barrier which keeps the water out.

I also clean the knuckle bore so the new bearing slides in place easily, I then grease liberally all surfaces that contact the bearing and also grease the entire length of the bolts.

My choice of grease is the 1lb can that usually costs less than $5. 00

Some use Neversieze. In my experience I have found that Neversiez tends to wash away in areas exposed to water splash, grease stays put.







Tim

 

[fireman717]

well my buddy has a truck like mine and he has the same problem went to dealer today and they said it was the front drive line of course that is after they argued with him it was the alternator. So is it possible that once to operating temp it could be a u joint front drive shaft issue?? Or is it a wheel bearing being mis diagnosed. I almost pulled my wheel today to do the bearing until he called.