Re: cracked lower unit 85hp ob
Welding it would be a better fix. You're lucky it wasn't worse. You obviously have water intrusion. Pressure test it after the fix, but before re-installing. I trimmed the butt of a tire valve stem to size and clamped it to the hose from a gear lube pump. Don't exceed 15 psi, or you'll turn the inner seals outwards (been there). A tub of water helps to find leaks. If it holds, the o-rings under the fill and vent screws are to blame. Plan to change them regardless.
OR
If you have it welded w/o removing the lower unit, change the gear oil and o-rings. Then drain it after a few outings. Milky looking oil would indicate the presence of water.
