806 new problem- engine knock!

I was trying to get my persnickety bailer to work today, while solving a bizarre hydraulic problem (see previous post), when a more serious one arose.

I had the clutch in, the gear shift was in 3, and I gently went to put it into Low. Now, on this tractor, there is some internal drag, so shafts tend to spin and you have to gently nudge and wait for the internals to stop before getting it into low range.

As I'm doing this, in preparation for getting rolling, I hear the engine start to take on a knock! Kinda like a piston slap perhaps. Now, I was not putting any kind of load on the engine AT ALL when this happened. The clutch was depressed the whole time.

The knock appeared as I was meshing into low range and before releasing the clutch. Am I in deep doo-doo?

I'll try it out tomorrow- maybe this was all just a bad dream...
 
Hate to say this but that knock vary well could be that the thrust bearing on the crank went to lunch . And if the gears are not stopping in a short peroid of time then the clutch trans break and dump valve are out of adjustment as the gears should stop turning within no more then 10 -15 seconds .
 

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