Is the steering over locking,and catching the track rod end
is it a wheel balancing wieght catching on the steering jiont
is it the hub bearing /flange worn or loose
is the brake caliper loose
are the brake pads low
is the back plate catching on the brake disc
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If the problem is as bad as it sounds, you may be close to parking it until fixed. Normally, if you turn left, your are "loading" the right side, and visa-versa. Think of it this way. Picture a car going fast around a turn. The wheel on the inside of the turn might actually lift off of the ground, it is "unloaded". With that thought in mind, look closely at the right front wheel. Start with the brake pads and /or rotor ( what the brake pads rub on to stop the car.) Check the rotor inside and out. A good flashlight will do. Pull the right front wheel and see if the pads are worn out or the rotor is no longer smooth, but "torn up" on the inside or the outside. If the pads and the rotor is fine, next look at the wheel bearings. This will be a bigger problem, probably a shop needs to check this out.
If its not the bearing and your Mercury is front wheel drive, it could be the "CV" joints.
It could be both....
Is the wheel rubbing the brake caliper?
Is something like the wheel well liner rubbing the tire(airflow pushing it into tire)?
Jack the tire off the ground and rotate it by hand. Push in & out at the top, sides, and bottom of the tire. Little or no play is considered acceptable. If you get a "clunking" sound and/or a lot of play the bearing(s) are bad. (If front wheel drive, chock rear tires, put transmission in neutral so you can rotate tire.)
if you slide under the truck and try moving the cv with your hands and there is any looseness in joint or noise the joint is indeed worn out, the cv joint if bad should not stop the truck from shifting into 4 wheel drive it could be stuck in 4wd and this would cause cv joints to break, if u have access to lift get all tires in air and try2 vs 4 drive and see if tires turn if not lift front tires off ground tires should turn freelyin 2wd, as u turn tires listen to wheel bearing and shaft noises for grinding clunking indicating bad parts, simple tricks that may help u find problems for cheap good luck!!
grinding on front wheel is caused by 2 things.
a bad or loose wheel bearing,or worn out brakes, have them both checked
You might also want to check the level of fluid in the power steering
reservoir - low or lack of fluid will also cause a noise (although more of a
whining than a grinding).