I recently replaced my shaft, carrier bearing, stuffing box & cutlass bearing leading from my year 2000 4JH3E Yanmar
and Kanzakee transmission
. With the smooth and quiet new carrier bearing I had noticed a ticking sound when I idled down to engage gears. A respected and knowledgeable Yanmar mechanic
advised me that this was "back lash" from low idle and of no concern. He said that it's best to keep the idle at no less than 850rpm. I do normally idle between 850 and 1000 rpm
and do not hear this clacking or tick, but I can't help but think that the lowest rpm
is advisable when engaging or disengaging gears; however, the mechanic
said keep it at 850rpm and it's best to hear the "thud" when you change gears. It seems counter-intuitive to me to have parts
moving faster when slaming them together, but I've been wrong before. So what are your thoughts? Keep the rpms up to 850 while engaging gears or press it down to the rougher riding 450rpm for the engagement?