Home › Forum › Ask A Member › Firestone 7.5 & 10hp outboards › Re: Firestone 7.5 & 10hp outboards
I don’t think it will stay in place either. Mine has filled from storage & guessing wear letting the 90 wt gear oil in. Best solution is to remove all 90wt oil & run with 105. It will not seep into the wrong side of the shift piston rod + leave it in gear compressing the shift rod compressed in reverse gear. Once I took it apart & drained out the 90wt inside the prop bore & replaced with grease it functioned much better but not good for the needle bearings I fear. I’m sure when new it shifted easy & didn’t pass lube past the shift rod. Needs grooves cut to accept a hydraulic square o-ring to seal it. I have had problems with o-rings rolling in the bore & pumping the other dead end full or leaking with surgery tables. Just go to a hydraulic shop before buying the size you need.
Anyone have a better idea? I’m listening. The gears & shafts are plenty strong as they look like quicksilver gears with straight cut teeth.