Oil leak can a harmonic balancer cause oil to leak?

probably the crank seal that the balancer runs against to keep the oil in the motor. you will have to pull the balancer off then pry the seal out and tap the new one into the timing cover. take a look to make sure as it could be the oil pan gasket. clean area and run car until you see oil coming out.

What is a Harmonic Balancer?
The Harmonic Balancer, or vibration damper, is a component connected directly to the front of the engine on the crankshaft. Its sole purpose is to reduce torsional vibrations created by the engine as the cylinders fire.

What causes Harmonic Balancer failure?
There are a variety of possible causes for balancer failure. Most common among these are heat stress, wear from road salt, oil leak, or ozone attacking the rubber components, damage inflicted by road debris, crankshaft failure, stress from integrated drive pulleys, and stress caused by loads from other devices such as power steering pump, AC compressor, alternator, air pump, and water pump.

That is the harmonic balancer. It looks fine. But they can twist some time and cause a vibration. The fluid on the right is oil. Probably from the valve covers

You have to remove the balancer again, to
replace the crank shaft seal

the garage may have did something to the crank position sensor that is located behind the harmonic balance. there is a ring gear there to for the timing

It should stop leaking if you replace the front harmonic balancer oil seal. With the amount of mileage you have on your car, that seal definitely needs to be changed.

I don't think you can damage the oil pump gear when torquing the harmonic balancer. Oil Pump Removal & Installation 3.1L & 3.4L Engine To Remove:

1. Remove the oil pan.
2. Remove the oil pump.
3. Remove the drive shaft extension.

Oil Pump and drive

To Install:

1. Install the oil pump.
2. Install the drive shaft extension.
3. Engage the drive shaft extension into the drive gear.
4. Install the pump to the rear bearing cap. Tighten the bolt to 30 ft. lbs. (41 Nm).
5. Install the oil pan.

3.8L Engine NOTE: The oil pump on the 3.8L engine is serviced as part of the engine front cover.

1. Remove the following:
   • Engine front cover.
   • Oil pump cover screws.
   • Oil pump cover.
   • Oil pump gear set.

Oil Pump in front cover

To Install:

1. Lubricate the oil pump gear set with petroleum jelly.
2. Install the oil pump gear set.
3. Pack the oil pump gears with petroleum jelly.
4. Install the oil pump cover.
5. Install the oil pump cover screws. Tighten the screws to 98 in lbs (11 Nm)
6. Install the engine front cover. NOTE: Do not run the engine until the oil pressure is tested. Running the engine without measurable oil pressure will cause extensive damage.
   
7. Inspect the oil pressure.
8. Inspect for leaks.

might be a front main seal... pretty easy or most likely it's a leak at front of oil pan

remove balancer and replace crank seal

You need to pull the harmonic balancer and replace the seal... if i remember right it's a one peice press fit seal

Robert