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#4610817 - 12/22/17 01:19 AM Stainless steel drain plugs in aluminum?
dakota99 Offline


Registered: 09/27/09
Posts: 463
Loc: indiana
Okay so I guess the ocd is kicking back in but I recently replaced the drain plugs on two champion generators with stainless steel ones (304) and now Iím wondering if this will cause a corrosion issue? The blocks are aluminum and I know the two metals can cause galvanic corrosion in certain cases but is this one of them? Iíd hate to have the threads or something corrode and leak. That or have the plug seize in place.

The generators had from the factory some rubber hose setup where you could lower it into a pan to drain the oil but it was extremely slow. I decided to just unscrew the hose assembly and thatís when I had to purchase some plugs to go in their place like a typical engine would have. I have a feeling this is fine but I wanted a second opinion.

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#4610830 - 12/22/17 02:05 AM Re: Stainless steel drain plugs in aluminum? [Re: dakota99]
resist Offline


Registered: 06/08/17
Posts: 40
Loc: left cose, USA
Tha t's not OCD son/

Maybe talk to this guy and you two can go on a date or something?
https://bobistheoilguy.com/forums/ubbthreads.php/topics/4610757/Have_a_1/2"_hole,_wha

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#4610841 - 12/22/17 03:14 AM Re: Stainless steel drain plugs in aluminum? [Re: dakota99]
DoubleWasp Offline


Registered: 05/21/12
Posts: 5236
Loc: Fort Lauderdale, FL
Stainless plugs and bolts, in aluminum, and immersed in salt water is common in the marine industry and stuff manages to survive.

I would not worry, but if it does bother you, just swap on next oil change.
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#4610896 - 12/22/17 06:11 AM Re: Stainless steel drain plugs in aluminum? [Re: dakota99]
Ducked Offline


Registered: 10/25/12
Posts: 4330
Loc: Taiwan
The threads are quite likely to be oiled.

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#4611090 - 12/22/17 10:24 AM Re: Stainless steel drain plugs in aluminum? [Re: dakota99]
SHOZ Offline


Registered: 06/28/03
Posts: 5744
Loc: Illinois
What kind of plugs were in there originally? SS is very stable.
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#4611107 - 12/22/17 10:43 AM Re: Stainless steel drain plugs in aluminum? [Re: dakota99]
dwendt44 Offline


Registered: 05/17/06
Posts: 3967
Loc: Central Wisconsin
Assuming you change the oil on occasion, there
won't be a problem.
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#4611153 - 12/22/17 11:24 AM Re: Stainless steel drain plugs in aluminum? [Re: dakota99]
boraticus Offline


Registered: 04/19/09
Posts: 2905
Loc: Canada
If that concerned put some grease on the threads of the plugs.

Considering that there will be virtually no water getting between the plugs and the block, and there will be residual oil there, I wouldn't be worried in the least.

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#4611160 - 12/22/17 11:27 AM Re: Stainless steel drain plugs in aluminum? [Re: dakota99]
Linctex Offline


Registered: 12/31/16
Posts: 6148
Loc: Waco, TX
Millions and million and millions of aluminum oil pans and transmissions use steel drain plugs. No issues ever.
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#4611206 - 12/22/17 12:10 PM Re: Stainless steel drain plugs in aluminum? [Re: dakota99]
dakota99 Offline


Registered: 09/27/09
Posts: 463
Loc: indiana
Thanks for the input guys. The other half of me thought it would be fine as well, just wanted to make sure. I do believe the original fitting material was zinc plated steel or something to that effect. The oil gets changed every two years or 100 hours.

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#4611505 - 12/22/17 05:16 PM Re: Stainless steel drain plugs in aluminum? [Re: dakota99]
tig1 Online   content


Registered: 01/03/09
Posts: 13657
Loc: Illinois
Most assuredly OCD in this application.


Edited by tig1 (12/22/17 05:16 PM)
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#4612435 - 12/23/17 06:33 PM Re: Stainless steel drain plugs in aluminum? [Re: dakota99]
cronk Offline


Registered: 01/06/09
Posts: 1287
Loc: Watertown, New York
Mild steel, stainless steel, both are fine.
Stainless fasteners can sometimes be victim of thread galling when threading into a harder steel, but an aluminum small engine case is softer than the stainless, so no worries.
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