Just got in from flogging my van through  Montana's, Idaho's, some Oregon
and​ Washington, too...Lots of washboard, large number of passes, etc...
But my first start this morning (Hell's Canyon). the starter seemed to spin
free for a fraction of a second before engaging...Second start, same  spin
up by the motor before it engaged..caused me to go home...my campsites
don't often favor bump starts...so home and?

  Guessing I'll need a replacement... any one brand better for a
 deisel...(gas really, but same castings.  Anyone know that
symptom...starter begins by free wheeling for a second before it grabs the
gear... thanks