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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.

#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?"_hole,_wha

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

Registered: 05/21/12
Posts: 5227
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.
07 Lincoln Navigator M1 0w-40/FU
68 Charger R/T / Supercharged 440 VR1/DBL7349
07 Ram 3500 4x4 / Cummins 6.7 /DBL7349
17 Maserati GranTurismo Cabrio

#4610896 - 12/22/17 06:11 AM Re: Stainless steel drain plugs in aluminum? [Re: dakota99]
Ducked Offline

Registered: 10/25/12
Posts: 3823
Loc: Taiwan
The threads are quite likely to be oiled.

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

Registered: 06/28/03
Posts: 5517
Loc: Illinois
What kind of plugs were in there originally? SS is very stable.
2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual

#4611107 - 12/22/17 10:43 AM Re: Stainless steel drain plugs in aluminum? [Re: dakota99]
dwendt44 Offline

Registered: 05/17/06
Posts: 3909
Loc: Central Wisconsin
Assuming you change the oil on occasion, there
won't be a problem.
There's no such thing as:
Too big of a battery,
Too large of a gas tank,
or too loud of a horn,
or too bright headlights.

#4611153 - 12/22/17 11:24 AM Re: Stainless steel drain plugs in aluminum? [Re: dakota99]
boraticus Offline

Registered: 04/19/09
Posts: 2852
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.

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

Registered: 12/31/16
Posts: 5198
Loc: Waco, TX
Millions and million and millions of aluminum oil pans and transmissions use steel drain plugs. No issues ever.
"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

#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.

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

Registered: 01/03/09
Posts: 13461
Loc: Illinois
Most assuredly OCD in this application.

Edited by tig1 (12/22/17 05:16 PM)
2007 Ford Fusion 223,000 miles
M1 0-20 EP
2017 Ford Fusion 43K
M1 0-20 EP
10,000 mile OCIs on both engines
M1 ATF and MC LV
M1 10-30 in all OPE
MC filters

#4612435 - 12/23/17 06:33 PM Re: Stainless steel drain plugs in aluminum? [Re: dakota99]
cronk Offline

Registered: 01/06/09
Posts: 1244
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.
1998 GMC C1500
2003 Chevy Cavalier
2011 Nissan Quest
1986 Pontiac Trans Am
1940 Ford 9N Tractor
Amsoil lubes and filters!