Mnemonic device for remebering which washer goes where on the diff.
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Mnemonic device for remebering which washer goes where on the diff.
The copper one goes on the fill. Silver one on the drain plug. Copper top just like a duracell battery. Whenever you do your diff fluid remember duracell, and copper top and you'll never make a mistake.
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Does anyone know why there is a need for two different metallurgys for fluid sealing on the same housing? Best I can think of is that one washer is in an area submerged by fluid while the other is not. Is one hotter than the other? Is aluminum, or copper better but one is used in one of the locations for cost reduction? Or maybe the chance of a catastrophic issue is less with an aluminum washer while failure of the copper washer above the fluid level would be a slower failure (fluid leak)?
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-Both plugs are steel, and the same thread
-both thread into the same aluminum housing
My GUESS is the copper one is used on the fill hole to allow frequent “checking” of the fluid level. Copper can withstand many times more compressions.
Aluminum will crush easier, but will conform better, for the drain where it is more critical to protect against leaks.
I say just order a second oem magnetic drain plug, and use it in the fill hole and run dual magnets
a great oem mod, and eliminates the need for a special 23mm wrench.
-both thread into the same aluminum housing
My GUESS is the copper one is used on the fill hole to allow frequent “checking” of the fluid level. Copper can withstand many times more compressions.
Aluminum will crush easier, but will conform better, for the drain where it is more critical to protect against leaks.
I say just order a second oem magnetic drain plug, and use it in the fill hole and run dual magnets
a great oem mod, and eliminates the need for a special 23mm wrench. 
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darcy
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@ rpg51: Good question! Maybe the Company that manufactures this screws for Honda (or Mazda) just do it this way, and Honda could buy them cheap "of-the-shelf" this way? Maybe equal hex sizes would be a costly "Special order"?
Only wild guessing....
On the gerabox are also two diffenrent sizes, this also dont make much sense.
@ car analogy: Me too. I have a garage full of metric tools, but dont had one that fits the filler screw - in between the subframe. But it is a fine excuse to buy tools.
Only wild guessing....
On the gerabox are also two diffenrent sizes, this also dont make much sense.
@ car analogy: Me too. I have a garage full of metric tools, but dont had one that fits the filler screw - in between the subframe. But it is a fine excuse to buy tools.
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