micky wrote:

On Sat, 27 Aug 2011 18:24:01 -0400, "Michael A. Terrell"
? wrote:

?
?micky wrote:
??
?? On Sat, 27 Aug 2011 08:12:38 -0700, "William Sommerwerck"
?? ? wrote:
??
?? ?"micky" ? wrote in message
?? .. .
?? ?? http://www.tegger.com/hondafaq/mainrelayfix/index.html
?? ?
?? ?? "Removal of old solder: As much of the old solder as possible was
?? ?? removed in preparation for re-soldering. It is possible to simply
?? ?? re-flow the old solder, but this method is better."
?? ?
?? ?It's the way I've always done it.
?? ?
?? ?Sometimes you can get away with adding a bit of fresh solder -- or better,
?? ?flux. But cleaning the joint is the preferred method.
??
?? Well, I learn something new every day.
??
?? I guess I've been doing this wrong for 50 years, but this time I'm
?? going to resolder a relay from my neighbor, and I don't want her
?? getting stuck, as she was last Monday, so my standards are higher than
?? they would be for myself. .
??
?? But I guess now that I know better, I'lll do it this way for myself
?? too.
??
?? Thanks, William, and everyone.
??
?? BTW, I could find liquid flux nearby, in time for the repair tomorrow,
?? so I got flux paste. I thought I'd put a little on with a toothpick
?? or matchstick?? If the hurrican means I don't work on the car
?? tomorrow, should I go 10 miles farther to buy liquid flux?
?
?
? You want a good, mild RMA flux, not just liquid rosin. My favorite
?was Kester 1544, but I think they dropped that formula now that they
?concentrate on reflow solder products.
?
? The proper method depends on what caused the failure. If it was
?properly wetted, but cracked around the pin becasue the board is single
?sided, a drop of fresh flux and a drop of new solder is fine. If it was
?caused by bad plating seperating from the pin, or poor soldering without
?proper wetting when it was made you will need to remove the old solder
?and clean the pins.

Thanks.

I don't know about future cases, but in this one** they say it's
because it's in the passenger compartment and gets hot then cold every
day in the summer, and cold then not every day in the winter. Plus
the viibrations.

The temporary remedy was to open the car doors and let it cool off
inside. (Although it wasn't a very hot day. It's run fine for the
last week, also not very hot days. But it was in the 90's and
hundreds for 4 to 6 weeks before this started.))

Nothing I read commented on the original solder job, IMO probably
because they can't tell and most of them own Hondas and don't want to
think it was made badly in the first place.


Most of them aren't likely to know anything more than which end of
the hot soldering iron to pick up, let alone the various failure modes
of soldered connections.


**which is such a common probelm it has several detailed webpages by
different authors devoted to it (the "main relay" of a Honda, which
contains the fuel injector/engine control computer relay and the fuel
pump relay)


--
You can't have a sense of humor, if you have no sense.