Just rebuilt the bottom end, and I literally fired it up about 2 hours ago. No leaks initially, but after I ran the engine to 200 degrees, I drove her back in the driveway and noticed one drop of oil on the ground, and one little drop on the crankshaft seal housing. So I jacked her up and ran it for another 5 minutes and nothing. Is it possible residual oil on the seals housing as I lubed it before installing?
Anyways, what symptoms are definitely a rear seal leak.
I used the Right Stuff on the Intake, and it has new oil pressure and temp sensors with good teflon, and WIX filter. Oil pan was put on with FelPro one piece and Rigth stuff in all 4 corners.

 

I'd just clean it up and watch it for a time. May be nothing.

 

Thanks

 

Well, I drove it slowly today through slow city streets to work, and as soon as I parked it a drop of oil fell. Then I turned it off, waited a while and nothing. Then about an hour later there was a little more oil on the wood I left underneath it.
So, I drove it home on the highway at/up to 80 mph with 3,75 gears so it was doing 3000 rpms for a couple miles. Came home, parked it and nothing.
I jacked it up and will cehck it when I get home.The back of the manifold, intake type, is dry. I will look at it again at home, as it is jacked up, and I may run it in the air like that and see if something happens. This is an odd leak.

 

what seal did you use?

some of them are not supposed to be lubed..

 

I used Fel Pro rubber, and only put a little oil to assist in putting it on.
Well, I looked at the area down there. The oil pan has oil between the pan and the blue rubber of the FelPro at the base of the housing of the rear main seal, so not the flat part of the gasket against the block. The Flexplate is dry. There was oil on the housing of the rear main seal, but I couldnt feel any oil on the side of the seal housing where the seal is, and with a que tip barely anything was there. I am thinking it is the pan gasket.
I am going to have to run it, on the jacks and watch it. Then shut it off and see what happens.
No smoke behind me or any burning, and transmission pan is dry.

 

tighten the bolts a little while its hot

 

i had some lube/oil drip off there when i first fired up my motor, it hasnt leaked since or anything, im guessing it was oil left over from the lubing process.

 

Good idea. cant hurt.