I've had oil slowly leaking out the front main seal area, around the fan pulley, since overhauling a couple years ago.  I finally took the timing gear cover off, planning to replace it and the seal (seal was new 2 yr ago and I thought the cover looked ok).  I did not have a leak there before overhauling.

Also oil pressure has not been what it used to be (though it's out of the red on gauge).

With the timing gear cover off I see a hole through into the crankcase. This is used for a gear shaft on diesel models.  My parts book shows a plug there for my gas engine, #K110.

Maybe the plug was removed and not replaced when the machine shop did work on the block?  Should there be a solid plug in there completely blocking the hole?   

Comments would be appreciated.

Tom Murray