Field-expedient repair
So, while waiting for a new clutch, I took a look at the old one. Mine is not air-gap adjustable. I could clearly tell by the unworn area near the hub that about .010" had been lost in the plate thickness, opening the air gap well beyond spec. So when the clutch got warm and expanded, it would let go.
What sets the gap is the length of the hub on the intermediate plate - closest to the engine. By reducing the length of the hub that should close up the air gap by whatever amount is removed.
So I took it over to the lathe and trimmed it a bit, shooting for .010" based on the Mk1 Eyeball. Just took a touch.
Once home, I zipped it back on and headed to the unfinished front yard. I finished mowing and then cycled it a few times. It seems as good as it ever was, possibly a bit better. The only possible negative is the blades do not stop as quickly, probably because the gap to the brake magnets changed. Might be my imagination as I never paid that much attention before.
So that worked out, and I have a working mower. I'll still change out the clutch (and grille shell - thanks Sam) but in the meantime I can keep up with chores.
Thanks for all the input guys, it was very helpful.
|