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Wave washers, fasteners, etc.
Posted: Fri May 01, 2009 10:04 am
by T.Hanson
Why wave washers ? What do they do, all thin and puny, besides crack in half.
Really nuts, BMW parts lists say 49 cents each or more. Half hearted Google finds a bag of 100 for a few bucks.
Two duck plates removed show the bolts deform them. My foggy engineering solution is more washer around the bolt to spread out the smashing, wondering why the BMW gang chose thin little wave washers.
Not to mention the odd O ring, with no torque specs anywhere.
Posted: Fri May 01, 2009 12:21 pm
by Mike W.
I can see their use on aluminum where a split lock washer might tear it up, and BMW does use some on steel/cast iron, but that's about it. Cheaper than a locknut and it does provide some locking action?
Torque on the duck plate is wrist tight.
My torque settings (except things like heads and rods) are as follows
6MM Wrist tight
8MM forearm tight
10MM full arm tight
12MM put your shoulder into it tight
14MM As tight as I can get it without a cheater or impact wrench.
Posted: Fri May 01, 2009 1:14 pm
by 1st 5er
Mike W. wrote:My torque settings (except things like heads and rods) are as follows
6MM Wrist tight
8MM forearm tight
10MM full arm tight
12MM put your shoulder into it tight
14MM As tight as I can get it without a cheater or impact wrench.
I like you mechanicing...
Torques, etc.
Posted: Sat May 02, 2009 10:36 pm
by T.Hanson
The aluminum ( surface ) explanation sounds logical. As the duck plate is steel and you like blue thread locker, puny wave washers appear to be one option, with others plausible.
I have lists of torque numbers but I like yours as a hedge for not having to thumb through books. One caveat, could you translate to snug plus a quarter turn, or half turn, three quarter ?
My wrist may be skinnier, or I'm foggy on if my hips must remain parallel to the perpendicular while rotating forearm, or shoulder may not be assisted by legs, etc.