Hello again, everyone.
Well I've got the 782 running again after having to mow the grass with an old Sears 6000 (circa 1991) most of the year. The Briggs & Stratton motor in the "confugliation" that was bestowed on me by a "friend" gave up the ghost 10 hrs into the season. The saving grace of the Sears unit was that it came with a Kohler Magnum 18 in it, in fact that's why I parted with $500 to acquire it. (If you're wondering why I would pay money for a parts tractor to fix a "free" Cub Cadet, you haven't driven a Sears unit or surveyed the mess it made of your lawn afterward.)
The engine swap went (mostly) OK, but I learned a few things along the way. First, although it made sense to me to bolt the motor to the frame of the lawnmower (see picture), as I finagled the last bolt in place over the frame cross-member late one Sunday night, I realized the only way the motor could truly be secured with bolts of standard length was to remove the mounting plate from the mower and bolt the motor to the plate (bolts pointing up), then re-install both motor and plate. (Besides, I had a devil of a time with the mounting bolt at the starter and had to resort to installing it upside down too.)
The re-install (not shown) went much more smoothly, although I still had to remove the blower housing to drop the bolt down through the motor's mounting hole at the starter, I just couldn't seem to manipulate it any other way.
With the block in place (without any "pillow blocks" as on the Sears 6000) the drive shaft bolted up cleanly. When the bolts on drive shaft are aligned vertically, the clearance between them and the blower housing is equal, so I figure the motor is installed "level" with the hydralic unit in the rear.
The motor started fine (after I opened the valve at the gas tank) and ran strong. If fact, it seemed eager to chew up as much grass as I could through at it. There is no comparing the Kohler to the Briggs & Statton engine that I pulled out of the unit as I received it, despite the previous owner's endorsement.
(The previous owner was very proud of the B&S and trashed the Kohler that he had replaced. In fairness, I'm not sure how the B&S would compare to the Kohler 17 Series I that I'm assuming he removed. Serial# on my 782 2030601U714899 --June 1980.)
I'm very pleased with the result of the motor swap and I am confident the Kohler will serve me well for at least another ten years. I'll post a note about what I found when I removed the shrouds from the Kohler and compared it externally and internally to the B&S unit.
I'll also post a bit of knowledge gleaned from finally re-wiring key switch so that it now works correctly, and offer my own logic diagram if none exists (its easier for me to trace issues using ladder logic). My thanks to the many people who have posted on the topic through the years, especially forum member Steve Blunier from Metamora, Illinois.
Finally, I put the last of my 15 year old can of Marvel Mystery Oil in the crankcase (about 6 oz, although I calculated it could have taken 12 oz) as well as a bit of MMO in the gas before I put it in the tank. I turned off the gas at the tank and let the motor die -- I should be ready to go in the spring, and I just can't wait!