Ford Windsor one piece rear main seal drip, advice needed

I bought a new rebuilt engine off a friend for a steal thr engine was never installed, appears to be built in 2010 using a new cast iron block with one pece seal.

I got around to installing it and only drove the car around a few times since we are having a rough winter. I notice a tiny leak coming off my bellhousing index plate, not a terrible leak buy a drip here and there.

I honestly am in no mood to remove the tranny and all to mess around. I wanted to know do the one piece rear mains swell up over time or can mine be leaking because its fresh and hasnt been used?

Ive been tempted to try a stop,leak additive but im not sold on that stuff

Leaks just tick me off especially on new components. I called the engine builder who my friend bought it from and they do not warranty any leaks of any sort. It iseems all engine builders plea the 5th on such.

 

I would check the intake in the rear before going any further,the 460 in my f250 developed a leak that I thought was the rear main but ended up being the intake leaking oil and running down the back of the block.

 

Could also be gearbox?

 

Yeah i checked the intake its def coming from the inspection plate between the bellhousing and block, the oil is the 10-40 i installed, i hope this will swell up and stop as i hate to tear this all down now for a stupid leak.

 

I ve had friends use stop leak and it does work. This was in older motors thou and not sure of the effects in a new one. I'd drive the car for 500 miles or so. It may just seat itself.

 

You have to be care full and not tighten flywheel bolts with a impact . It will distort sealing surface of the crankshaft . Hopefully you used a torque wrench

 

^^ that is true, also one piece seal can be changed without disassembling the motor? If crank is marked from over tightening speedy sleeve may work

 

I put the flywheel on using the air gun but at very low psi just to get the screws all in then went over it by hand. I didnt have rtv to put on the flywheel bolts so i used loctite blue and maybe this is where my leak is coming from. My buddy who helped me told me last night about this which i totally forgot. I know leaks can happen from the flywheel bolts

Once the weather breaks il throw some miles on it and see and if it gets worse i have no choice but to tear into it.

 

The seal is neoprene, I can't see it expanding.