ive a light weep from the bottom of gearbox/rear of sump
suspected the rear main eccentric shaft seal
i used a borascope in through the starter motor apature to confirm...
small film of oil on inside bottom of bell housing...see oil in pic...no oil on rear of engine or flywheel..
small stain on taper portion of flywheel where it connects with the seal...
i dont know if its worth fixing ,....very small leak..
2000 miles on new build a lot of corrosion...just out of warranty on rebuild ..
warranty was on engine...didnt cover installation removal...
could i have damaged the rear bearing putting engine in..>?
engine got left out in rain by accident before installation...had a cover but it blew off in a storm..i had the flu..\please...constructive comments only

 

I wouldn't be concerned about that at all honestly. It doesn't look like its actively seeping or leaking. The other weeping or seepage you are talking about could be coming from the trans around the input shaft. If you're seeing wetness building up on the bottom of the bellhousing and have already confirmed that the rear main isn't the culprit , I would suspect the trans.

 

thanks for the vote of confidence. ..you don't think that its anything to worry about?
i actually used the borascope to check inside the bell housing. .gearbox end bone dry..just clutch dust ...didn't put the pics up
The car was standing for a month. ..is it possible that a slight weep started then re-sealed around the rear seal...or ...Alternatively could the sump leak into the bellhousing...make its way in

 

You are fine. It is normal for both seals to weep a bit as they break in. You can tell which one is weeping the most by smelling the joint. If it smells like sulfur, it is the transmission input shaft seal.

If you are really worried about the rear main seal, you can use high mileage oil in your next oil change, which has base 5 esters, which swell rubber seals. There are also additives available for the tranny to do the same.

But, I wouldn't' worry about it for several thousand miles. I recently put a new clutch in my Miata and changed all the seals and gaskets at the same time with Mazda OE parts. I had some minor seepage from several seals for up to the time of the first oil change, but everything sealed up sometime before that. I wiped the oil film clean and have not seen any since then.

 

thanks bro for that information. ..makes me feel a lot better. ..yeah I've only been driving the car at the weekends so if what your saying is true the seals are not getting a chance to bed in...I've only put 1500 miles on the engine so far...i through in some additive a few weeks ago to swell the seals a bit...it seems to have stopped the leak...