OP
zmotorsports
ALLIANCE MEMBER
Thank you Mike! I’ve never had the reason for replacing the crush washer explained before! I have always just inspected the washer and then reinstalled it and torqued the drain plug to spec. Now, I GET IT! More stuff to buy, thanks again!
Think of it like this Sterling, when tightening a drain plug into a cast aluminum pan, or worse plastic/composite, the washer's role is twofold. First to seal and secondly to provide some cushion or "crush". When a new washer is used, that "crush" is designed into the washer in terms of density or material composition. Once that washer gets used several times, that cushion or crush is gone and now it is a solid spacer, so when tightening a drain plug using an already compressed washer, there is no give so the threads are what will give. It will start out a little, then a little more and finally the threads are pulled out of the component. Washers/gaskets are much cheaper than damaged threads.
Also, not all of these need to be purchased from the dealerships at higher costs. For example, I purchased a few from my local Honda/Acura dealer for the wife's car in order to obtain proper part #'s and/or examples or sizes, then I watch for them on sale through various vendors once I get down to only a few on hand and reorder in quantities of 10 or 20 and I'm good for a while.
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