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Posted by Ben (76.14.17.32) on 12:13:10 07/16/08
In Reply to: Never used one for the fuel filter. posted by Marty
: Never had a problem either. The nuts are not too soft to allow deformation with a standard open ended wrench.
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On the good day...yes...but for that day when there is bit of corrosion or dirt or whatever, it
will round off.
The whole philosophy of this design is to seal *WITHOUT* a gasket of any kind.
It must be soft enough to mold itself around any irregularities. Similar to a brake caliper banjo
copper washer and why they should NOT be reused as they harden while molding around the joint.
These flare nuts are designed to be grabbed by more than two points at that end of the torque
bell curve.
OnBelay prefers those crow feet, but I'm a cheap SOB that would love to have that set, but $$$$
has me making my own.
The amount of torque should not be so high, as to deform a cut box wrench.
I've used open ended for years till one too many rounded flare nut. That was on my 1973 K5
Blazer's ATF fitting to the radiator. It was getting a bit rounded with each flush and finally
rounded and needed the old vice grip solution.
Bought a set of flare nut wrenches but they were not as tight as I'd liked. Finally lost a couple
out of that set and made my own from an extra Craftsman. That did it for me and have been
making my own ever since the mid 80's (yeah, loaned some out and never got them back).
Flare nut unions are for high vibration, aggressive fluids and/or very high pressures that
would have gasket replacement at each cycle of loosening/tightening. There are very good unions
with gasketing, but they are expensive compared to this type of union.
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