Re: 165 (FB460V) overheating and losing power
It's a cool breezy day... tank was nearly empty, so I put it back together, filled it with no-alcohol premium, oiled the foam pre-cleaner hoping maybe it was running lean without the restriction of oil, fired it up (has always needed several seconds of cranking when cold even with choke completely closed), started mowing lightly.
Not all that much power at first, but able to maintain RPM in light grass.
Just as ever, it started slowing down (checked to make sure the throttle was wide open).
After a few more minutes, I could either run the blades or move the tractor but not both. It couldn't even haul me up a modest hill with the blades disengaged. And it won't even rev to full RPM with the blades off, sitting still!
I shut it off, drained the bowl (gas wasn't particularly hot), let the electric pump run with the drain open for a few seconds then refilled the bowl (to make sure hot gas in the carb wasn't the issue). It started right up... but still no power at all.
Hydro unit is cool to the touch, brakes are not dragging, blades/spindles turn with little effort.
I have concluded that the engine internals must be defective somehow. Either it's binding up as the piston expands, or the rings are worn out (although I can't see how with 65 psi cold, 85 psi hot compression and no blue smoke!) The only Hail Mary left before pulling the engine is checking the intake valve clearance. (Again, it starts fine hot, just takes a bit of cranking when full cold). That means I get to take off all the tin again, and the carb, and the head.
I'm about to just look for a good used rebuilt FB460V-BS00 (JD), or maybe repower the @#$% thing with a different engine. I really don't feel like trying to rebuild it again since the by-the-factory-book didn't fix it!