Now this is problematic! Makes me wonder what shape the flywheel is in. So the flywheel gets lapped to the crankshaft and a new key. May choose to replace the flywheel.
The flywheel is a bit stubborn so I started it with PB Blaster.
Used a 3 leg puller with an air impact the next day and it came right off.
The key serves two purposes. It aligns the flywheel during assembly. It also serves as a shear pin should the motor stop too suddenly. But in normal operation the tapered fit between the flywheel and the crank is what holds the flywheel, not the key.
I mowed for a while. The engine restarted when hot which was good. The intake may still be a bit loose but it is useable. But then it backfires now and then when I crank it so I don't know.
Wednesday, April 8, 2015
Maybe I could have just changed the guide plate but I swapped out the entire head. So lurch now has the head from the 1st 31P777. I put the valve cover back on which is correct for the engine. There must be some difference between the blocks as the replacement head came with longer head bolt screws that did not fit. The heads are also different castings.
I started and ran it for maybe 30 seconds. Cranks over real nice and did not backfire, throttle response is good. Did not smoke much but I wiped the oil out of the cylinder that had collected while it was sitting. Maybe a bad oil control ring. Going to give it a workout tomorrow. Maybe drive it up to coffee.
Thursday, April 9, 2015
Ran the tractor up to coffee and back to see if it would fall apart. The people said it was quite loud. The engine was a bit hard to start on the way home. Has started well since then. Installed the bagger and mowed a bit when I got back. Dumped 3 baskets. The tube plugged once. The new bagger hook gasket works well.
Added a set of std piston rings to the "not now list".