QUOTE(914werke @ Jun 27 2018, 11:28 PM)
No, this is the approx 1" one at the bottom nearest the Taco plate.
I thought if I removed the Eng bar & motor mount Id have enough access
to avoid dropping the motor .. perhaps not.
You might be able to do that one in car, it's a 8mm key threaded plug. try to remove it, clean and reinstall with a sealant.
Worse case scenario, the key strips out, I'd do a spotless cleaning and rough it up then use an epoxy like hysol or JB weld to seal it from the outside.
This is commonly done as part of a /6 engine rebuild.