Home › Forum › Ask A Member › pinion gear blowout on newer 25/35’s › Re: pinion gear blowout on newer 25/35’s
Pinion failure/driveshaft breaking/twisted splines are not uncommon for many styles of gearcases after hitting an obstruction, not just the 25/35 OMCs. SS props usually amplify the internal damage as well. Generally speaking, the 25/35hp thru hub gearcases are pretty rugged/reliable. Like anything else, people will find a way to break this stuff, especially during panic shifting maneuvers at high RPMs. I remember that OMC did elongate that pinion neck, utilizing two needle bearings, I’m guessing this was to give the pinion more support to ensure it stays properly positioned. It doesn’t seem like this deign change would make the pinion weaker/more prone to failure though.