Re: Powerhead Bolts
I went to Fastenal today to order the Scotch-Grip 847 and to get the bolts. Nearly all of the old bolts stuck to a magnet, so we realized that they weren't stainless. However, after 47 years of being in the water and out in the humid air, none of the external powerhead bolts had any corrosion. Some of the bolts had a paint covering over the head, but many of the bolts were missing the covering yet there was no rust/corrosion. We were a bit perplexed as to how steel could do that so I called two local boat shops-one of which specializes in OMC. Neither one had a clue as to what these outboard bolts are made of and one guy acted ticked off that I would dare ask a question like that (?!?). I'm glad you guys are here!
Anyway, I decided to go all stainless to avoid corrosion. Also, in order to avoid galling at the interface of the stainless and aluminum, I bought Loctite Marine-Grade Anti-Sieze that is rated to 2400 degrees or so and is supposed to prevent galling in these situations. I hope that I made the correct choice for my bolts. If anybody thinks that this was a bad choice, please let me know! I can still take the bolts back until this weekend when I assemble the powerhead.
Lastly, I needed a few flange-head bolts but Fastenal can't get them in stainless. Is there any difference between using a hex-head with a washer and using a flange-head bolt? If not, then I'll just get the hex-heads and washers. Thanks.