Oil leak from front

2002 3.4l auto 4x4
Have a good size oil leak from the front bottom of the motor.
When at idle, it will drip a little. Maybe one drop every five minites.
After driving, oil all over the underside if the engine.
I'm thinking it's the crank seal.
Question is could the oil pump or oil pan cause this kind of leak????

 

Hard to tell but if you'v never change out the pan gasket or the crank seal then you best clean up the oil leaks off the engine and investigate where its coming from while the engine is runninig. Flashlight will help in this case.

 

I cleaned the oil off with Oil Eater. Letting it dry off over night. It was a mess under there.
I'm planing on removing the wire housing to get a better look at where it's leaking.
If it looks to be from behind the lower cover, I may take it off and run the engine.
I'm just wondering if there's something with the oil pump that might be pushing oil out.
I'm hoping it's just the front seal.
I'll also check the PCV valve to be sure it's open.
Leak started all of a sudden, so something went bad.
Hate looking for oil leaks..

 

All leaks start suddenly. 1 moment it doesn't leak, next it does. Most leaks actually exist for quite a while before they get bad enough to be noticed.

 

Got it all apart. Main seal leak.
Have to take the belt off yet, so not sure if it popped out or what.
Seal changed five years ago, same time as the timing belt job.
I silicone my seals in, so I don't think it popped out.
Dipstick tube was leaking some.
No other leaks I can see.

 

Got it done. Seal looked ok, but trail of oil from it.
Ran it for about 15 minutes and no leak.
Going to let the silicone dry over night and road test tomorrow.
Older Toyota engines had a rear fiber seal. Never ever saw one that leaked.
I wish they would bring it back, and make a fiber front seal.

 

I'm skeptical about using silicone sealant there. You'd have to get the metal super clean for it to stick, and the seal typically leaks from the inner part of the seal anyway. Toyota doesn't specify that you need it. And it might make it harder to get out next time if it does stick.

 

You added silicone to the crank gasket? Wow,

 

Adding silicone to the outer ring on a crank seal is a way to ensure the seal does not leak and it won't make it any harder to remove. It actually can help the seal go in easier. It has been done many times by many peoples. I'll add a smear when installing just because.