Well redid the exhaust seat in the 18 hp L shape twin and running like a top at least for a while, some how now the oil seal behind the flywheel is leaking enough that it will go through about a cup of oil everytime i run it, got to the point that it started collecting on the flywheel and gumming up with dirt causing problems with the coil so time to take it off and redo it. The problem is it wont budge used a puller and snapped off two 5/16 bolts got them out , then they just pulled out the treads in the flywheel so I drilled and went to a 3/8" same thing happened pulled out the threads in the flywheel, so I bypassed the 7/16" and went to 1/2" redrilled and re-tapped , have a lot of tension on it now put some heat to it sprayed it and tried just about everything I could think of to get it off but it wont budge.... It was off last fall and had problems then but after two days it finally came off.... any Ideas for some penetrating oil would Tanny fluid work or something that could be drawn into where it fits into the crankshaft???? I am at my wits ends with the briggs.... almost to the point of buying something else to power the mower.... perhaps a honda...