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#1
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stainless bolts frozen in aluminum backing plate
ok, so I have to remove a few rod holders and 2 of them have aluminum backing plates and stainless hardware. galvanic action has absolutely frozen these things in the aluminum! It is a very tight spot and I've tried really cranking the bolt heads and bashing the bottom of the bolts with a hammer, nothing has budged em! Does anyone know of a chemical I can use to eat through the oxide around the bolts without destroying the fiberglass? The only other idea I had was to cut off the bolt heads but this could damage the rod holder. The previous owner was a good guy but I cursed his name a few times today for using aluminum with stainless fasteners! any ideas???
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#2
04-14-2012, 01:47 AM
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 Can't really visualize what you're talking about. How thick are the bolts? 1/4"? How thick is the plate that the bolts go through? 
__________________
1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer 1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer 1996 V21 w/1993 200HP Mercury on a Shoreline Trailer All towed by a 5.7L Hemi Durango. If God didn't have a purpose for us we wouldn't be here, so Live simply, Love generously, Care deeply, Speak kindly. (Leave the rest to God)  Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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#3
04-14-2012, 09:00 AM
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There it is. I put everything I had into turning those bolts, nothing... I removed the nuts and washers without issue.
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#4
04-14-2012, 09:35 AM
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Maybe grind them flush then drill them out stepping your drill bit size up as you go? the pic i just noticed is under the gunnel, i would drill from the top side useing the phillips head insert on the bolt head as a center guide then drill then out.
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#5
04-14-2012, 10:40 AM
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I agree with Kracker... Drill from the top, stepping the drill bit size larger and larger as you go.
As an aside, you made a comment about using dissimilar metals (like alum and ss), and you're right, up to a point. An Anti-seize compound MUST be used on any Stainless Steel nuts, bolts, clamps or other hardware to prevent galling and thread seizure. So, you can use them, if you put an anti-seize compound (like Never seez) barrier coat on them first. I've sucessfully removed nuts and bolts that were on a boat for 20+ years that were coated with an anti seize compound before they were assembled with very little trouble. I've heard that it was invented for the military. Truthfully, I don't know who invented never seez, but coating all bolts before assembly was just about a required proceedure when I was in the Navy.
__________________
1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer 1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer 1996 V21 w/1993 200HP Mercury on a Shoreline Trailer All towed by a 5.7L Hemi Durango. If God didn't have a purpose for us we wouldn't be here, so Live simply, Love generously, Care deeply, Speak kindly. (Leave the rest to God) Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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#6
04-14-2012, 01:25 PM
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Try an impact driver
I agree on the anti-seize - use it on everything on the boat. Have you tried an impact driver? I've gotten screws loose with that simple tool that nothing else would budge, particularly in a phillips head.
__________________
 Scott, Portland, OR '85 V-20 I/O, Merc 170
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