Aluminum or Copper Washers

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4,851
Location
VA
From reading in another forum I now have a question. Should we only use aluminum washers on our aluminum oil and AT cases? I've seen where it seems most people don't think we should use copper anti-seize on spark plugs going in an aluminum block. Should we not use copper washers between aluminum parts? If so, why?
 
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24,181
Location
MA, Mittelfranken.de
Originally Posted by Gebo
From reading in another forum I now have a question. Should we only use aluminum washers on our aluminum oil and AT cases? I've seen where it seems most people don't think we should use copper anti-seize on spark plugs going in an aluminum block. Should we not use copper washers between aluminum parts? If so, why?
Most copper rings used as seals are not dead soft copper but a copper alloy and takes more torque to seal than aluminum which in most seal washer applications is very soft. Many OE manufacturers use aluminum washers/rings for sealing on aluminum, steel and iron without any issues.
 
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1,664
Location
Prospect, KY
Originally Posted by atikovi
Use this style and you don't need no stinkin washer. [Linked Image from images-na.ssl-images-amazon.com]
Where you get these at? Are they self sealing by that design? Assume they last alot longer than crush washers. Personally have reused many crush washer and none have ever leaked though. Also have some that have a built in flat washer that seems to work quite well.
 
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3,172
Location
Outer Banks, NC
The only two vehicles I've owned that called for <span style="text-decoration: underline">copper</span> oil drain plug washers were a 1996 Isuzu Trooper and a 1987 Alfa Romeo Spider. All the rest specified aluminum, except the odd Toyotas of the 1980's that used fabric washers.
 
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15,004
Location
NE,Ohio
I usually use oem style. Crushing type on subaru, Flat alum. on hyundai. gasketed plug on jeep. etc. My favorite are the subaru.. they physically crush (hollow) and its easy to tell when they stop crushing/fully tight. The flat non crushing hyundai style is ok I just go hand tight with a short ratchet. least favorite are the gasketed plugs.. I feel I always overtighten them.. but if you ever had one come off/loosen on you(I have) its an easy mistake to make. Fortunately as long as you arent stupid they can take abit without failing/causing damage. ie they arent plastic.
 
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4,117
Location
SW Ohio
If by mixing different metals, you're thinking of "galvanic corrosion", for all practical purposes it's not going to happen with a washer. Threads, i.e. a steel fastener into an aluminum tapped hole, are a different matter though.
 
Messages
4,117
Location
SW Ohio
Originally Posted by atikovi
Use this style and you don't need no stinkin washer.
Be careful with those or be aware but the rubber o-ring can apparently fall out of those. My wife's Fusion would drip unless I really snugged down the oil drain plug, snugged tighter than I liked. I have some Honda aluminum crush washers and tried one of those - problem solved. Later, I looked to see if Ford uses a sealing washer or something and that's when I found that they use this type of plug with the built-in o-ring.
 
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