Re: 72 Johnson impeller (sorry to keep bugging)
Use a drill, and drill the head right off that trim tab bolt. Centerpunch it first, so you can drill a real accurate, well-centered hole right up through the bolt head. The trim tab will then fall off, and you can remove other bolt found underneath it. <br /><br />If that one gives you trouble too (likely), hit it with an oxy-acetylene torch, or HARD with a propane torch. The castings are aluminum, the bolts stainless steel. These two materials expand way different amounts when heated, so when you heat them you break down the bonds. <br /><br />Once the lower unit drops off, you'll be left with nice, fat stubs of bolts you can grab with a GOOD brand of vicegrips (as in ViceGrip brand, not the Chinese stuff). Hit the area with the heat, splash some PBBlaster or WD40 on there every once in a while, and work that bolt out. It may only turn a little bit at first. No sweat, you've got it beat. Just work it back & forth forcefully but not overdoing it, hitting it with the heat & the PBBlaster every once in a while...it'll pop right out.
