Crankshaft Wear Question - YSE 8.

[Wotname]

Originally Posted by jimbunyard

Depending on how tight the fit the bearing is in the front housing, the helix of the front gears, and possibly the oil pressure, running may or may not compress the burr. Seems I remember that all the wear was on the rear bearing...

I'd guess that you're alright at .004, but specs are written for a reason...

If the press fit of the bearing isn't too tight, a good rap with a 2 lb hammer and a block of wood on the flywheel end of the crank should be enough to flatten the burrs, or at least see if there is movement in the right direction.

If not, standard notebook paper is about .002"...

Thanks Jim


I had previously tried a gentle tap with the hammer but emboldened by your suggestion, I have used a bigger hammer and some more welly - now have a 5+ thou end gap so all is looking good.

Yes all the previous wear was at the rear bearing surface (flywheel end).

FWIW, the front thrust bearing/washer sits against the crankcase body (now with the shim between the body and the washer); all the gears in the engine (and gearbox) are straight out and I'm expecting the oil pressure to be very good - the oil pump housing has been machined and all tolerances are back to original specs.

[hellosailor]

Guys-
Use paper weights (thickness) with a grain of salt these days. "Standard" weights of paper for printers, copiers, notepads, all have changed over the years. The cost of materials keeps going up, so the product makers keep scanting. In bound blank journals, you'll find some are literally double the page thickness of others. Aluminum foil for the kitchen? Some packs have also gone to thinner gauge.
Common printer paper might be 16/20/24 pound, big variation. And the clever ones now sell "reams" of 400 sheets instead of the standard 500, and "cases" of ten instead of twelve. So what was 6000 sheets of paper is now 4000 sheets. Or, much thinner paper.

[Wotname]

For anyone still following this thread and wants to see the next rebuild issue, please go here

Yanmar YSE Liner Question - Cruisers & Sailing Forums