I recently acquired a Mackissic sc 138 chipper/shredder at an auction. It has a Briggs and Stratton 16HP V-Twin OHV Vanguard engine. I discovered gasoline in the crankcase when I changed the oil. Determined that the problem is with the carburetor and have ordered a rebuild kit. It is relatively easy to remove the gas tank to gain access to the top of the carburetor. What my problem is being able to get access to remove the carburetor. My question is, can the carburetor be rebuilt without removing it from the engine?