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Stainless Steel and Aluminum Interaction

Joined Mar 2003
9 Posts | 0+
Dolores & Grand Junction, CO, USA
Don't laugh, but has anyone had experience with stainless oil plugs corroding or seizing into aluminum or magnesium cases? If so, what if any anti-seize products are recommended. Now I'm wondering about my stainless oil filters?? Any suggestions would be appreciated.

Thanks, Dave

98 FC501, 03 KTM 450EXC
 
Yes, I've seen it many times in the marine industry. The most effective product I've used to combat this galvanic reaction is this>> Stuff! << Mercury make a similar product. I've easily removed stainless screws from aluminum and magnesium alloys even after a few years in the salt-chuck. It works better than anything I've tried.
 
Grok, Thankyou. I'll get some.

Berger: I have been considering putting stainless steel oil plugs and SS oil filters in my KTM and got to wondering about my Berg as well. I'm familiar with the problems of dissimilar metals and got to thinking about potential problems. The manufacturers seem to use only mild steel but that is probably a cost consideration. I welcome your opinion though.

Dave
 
I used to work in a bike-shop. The worst hardest thing on the planet, are pedals welded to the arms of the crank. HORRIBLE.

One place to look out on the Bergs are the chain tensioner. those two M10 bolts are stainless, and will stick to aluminium like flies to dung. I have to have mine drilled out and helicoiled ( on a 04 bike)
The same goes for the sump plug. On my last bike, it had seized.

I always use some Copa-slip now, between aluminium alloys and steel.
 
The filter would not be a problem due to the rubber gasket on it . The drain plug should not be a problem due to the amount of lubrication and frequency of use. It also would have an aluminum washer. As far as other applications a liberal coating of Anti-Sieze (Permatex) seems to work for me.
 
On bolts & nuts used around water I'd thoroughly recommend a lanolin (yep - sheep wool fat) based anti-seize.

The stuff I use is called Lanocote, but I'm sure I have seen other brands of similar stuff out there. While not the absolute best from a lubrication point of view, as is needed on moving parts, on bolt threads it keeps the water & salt out very well & stops any corrosion. It certainly seems to lubricate well enough to stop both stainless on aluminium & stainless on stainless from galling or "picking up" as you move them.

On bolts that stay at about room temperature it is gooey and tends to prevent a loose bolt from falling out or nut from coming off.

I've had bolts in salt water outboard motors that were each a major battle to get out without destroying the housing. Put the bolts back in with Lanocote. Stripped the engine again a few years later & the same bolts came out easily.

I tend to use it on any bolts & nuts that get exposed to the elements. It is no good at high temperatures such as on exhausts.

It also makes your hands nice & soft! :)
 
Thanks to all for the input. From now on I'll treat each fastener or application with a suitable coating. Also watch for correct washer and torque.

Dave
 

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