1997 Toyota Pickup Tacoma 3.4 noise behind timing cover, an

Engine Mechanical problem
1997 Toyota Pickup 6 cyl Four Wheel Drive Manual 142k miles

Our Tacoma 3.4 has recently developed a sound similar to a wheel bearing that is going bad. This can be heard clearly at an idle behind the timing belt cover. The sound speeds up with engine RPM as well. Last night I noticed a oil leak on the driveway below the front of the motor. With a light, and small mirror I was only able to see that the oil is running from somewhere in or above the water pump area. Without removing the timing cover, I can't tell for sure.

Before I go and assume the worse, or the least, I thought I would ask here if anything like this may be a repeat offender to this particular motor that you have dealt with.

Thanks,
Craig