to loc-tite or not to loc-tite, any answers

[sparkroost]

I am re-building an outboard. Should I use loc-tite? I have replaced all the bolts with hardened socket head cap screws. Won't they vibrate out if I use never sieze?

 

[DJ]

Re: to loc-tite or not to loc-tite, any answers

sparkroost,<br /><br />I wouldn't use it. As long as they are torqued correctly, they should not vibrate out.

 

[Dhadley]

Re: to loc-tite or not to loc-tite, any answers

Make sure they are plated to prolong the rusting as long as possible.<br /><br />Good luck!

 

[sparkroost]

Re: to loc-tite or not to loc-tite, any answers

I coated the heads with galvanizing paint as a primer, then high heat spray paint. That gal. paint comes off easy with just contact cleaner. Hoping a coat of engine paint will cure it and allow some penetrating oil to get on it and not remove the paint. I hope it holds when tightening them, or I will have to touch them up after install.<br /><br />I also have some grade 6 brass bolts(not really brass, but some brass coating) But there not as strong.<br /><br />most of these torque at 2 ft.lbs! sheesh, that is nothing.

 

[Paul Moir]

Re: to loc-tite or not to loc-tite, any answers

I use "please hold this bolt" blue mainly to seal the bolt and keep corrosion out so they're easy to pull next time. I guess permetex 2 or neversieze would do the same though.

 

[bluechips]

Re: to loc-tite or not to loc-tite, any answers

I'd go the other way. use a copper based antiseizing compound. So that the next time you go to work on the motor you wont be snapping of bolts. epecially if it ever goes into to salt water <br /><br />if your worried about them comming loose, use new lock washers on em<br /><br />every bolt and nut my bike and truck ive ever pulled off, hase it on it.

 

[Paul Moir]

Re: to loc-tite or not to loc-tite, any answers

I'de stay away from lead based antiseize. Lead is far more noble than steel or aluminum on the galvanic series...

 

[bluechips]

Re: to loc-tite or not to loc-tite, any answers

noble??<br /><br />i just know steal and aluminum will chemicly bond over enough time. you want somthing in between the threds.

 

[John Reynolds]

Re: to loc-tite or not to loc-tite, any answers

Lead is more noble (less reactive) so stay away from it? I don't get it

 

[sparkroost]

Re: to loc-tite or not to loc-tite, any answers

ok, I found some Medium carbon alloy steel,<br />quenched & tempered, grade 8.. They are a brass color...Do ya think these are plated brass for corrosion purposes? 6 slashes and a "U".

 

[fridays]

Re: to loc-tite or not to loc-tite, any answers

Heaven forbid...whatever you do ignore Bluechips advice about copper anti-seize if you use your boat in saltwater. Copper+Aluminum+Saltwater = BATTERY with the Aluminum being the anode that disintegrates. Use a nickel based anti-seize if you are in saltwater. Believe me, I speak with 24 years of experience around saltwater.

 

[sparkroost]

Re: to loc-tite or not to loc-tite, any answers

Thanks for the input guys. Looks like I opened up a can of worms.<br /><br />Thanks Fridays for the warning!

 

[Dhadley]

Re: to loc-tite or not to loc-tite, any answers

I do it the old fashioned way and use ss bolts. We've even built the motor and then replaced the bolts after the painting so the shiny heads stood out. It looked kinda cool on a crossflow with all those shiny dots.

 

[John Reynolds]

Re: to loc-tite or not to loc-tite, any answers

I used marine grade 8 oz. Brush Top Can of Never-Seez NMBT-8 $11.98 Ordered it at http://www.kgsupply.com/ but other places carry it too. On the can, it says it has in it: aluminum, barium oleate, copper, molybdenum disulfide, graphite, zinc oxide, and other stuff. I know that in the electrical trade, we used zinc oxide grease if we had to make electrical connections between aluminum and copper. That prevent the galvanic (battery) action. It ought to work with water too; take a look at it this way: The voltage induced between dissimilar metals aluminum and iron while they are submerged in water has got to be a lot less than my electrical connections. By the way, using zinc compounds was not my preference but an industry standard.

 

[dkondelik]

Re: to loc-tite or not to loc-tite, any answers

wonder if this will promt a response?<br />I use High-Temp Silicon RTV. Works as both a "Loc-Tite" and as an "Anti-Seize". Not a long track record but seems to minimize corrosion & battery effect of dissimilar metals.<br /><br />Wudda-u-think?

 

[jim dozier]

Re: to loc-tite or not to loc-tite, any answers

The "brass" colored bolts you mentioned are plated with cadmium I believe which can give it a brassy look.

 

[sparkroost]

Re: to loc-tite or not to loc-tite, any answers

I am wondering if I can use those "brass colored" bolts.. I can't seem to ID them only that they are grade 8. Plus they are brass/gold color.. I am sure I can make up a story that I used PURE GOLD.. he he<br /><br />I am with Dhadley.. I want those bolt heads to stick out. It will let someone know that the engine was just not "spray painted". I pride myself on quality. Using the old bolts, painted, seems like a poor quality thing.

 

[John Reynolds]

Re: to loc-tite or not to loc-tite, any answers

Grade 8 is good stuff. Automotive grade, for high torque applications like engines. They are hard, but they will bend some without breaking. Grade 8 bolts have 6 slash marks. Grade 5 have 3, and grade 2 have none. Not all grade 8 are plated. The plating reduces friction, so that nearly half as much torque while tightning is required to achieve the desired clamp.<br /><br />If you want the best (lighter and stronger than grade 8), titanium bolts (at around $3.50) you can get some here: http://www.teamlorenz.com/aircraft_bolts.htm <br /><br />Torque, being the measurement of friction, not tension, required to induce given preload (clampload) in a bolt for non-critical applications.

 

[sparkroost]

Re: to loc-tite or not to loc-tite, any answers

I am not quite ready to spend 200.00 on bolts. I think these plated grade 8 bolts will suffice. They are defintaly plated. I smashed one to see and it's only plates. I am assuming that they are plated for rust, but I am not sure. what other reason would they be plated? I have looked and looked at bolt ident. to not find these

 

[John Reynolds]

Re: to loc-tite or not to loc-tite, any answers

The plating makes them easier to torque. Some grade 8 are not plated. Some grade 8 bolts are medium steel, some are stainless. The grade is a measure of clamping strength. <br /><br />I just metioned the high-dollar titanium bolts becase someone might think it interesting.