8 Aug
2006
8 Aug
'06
12:12 p.m.
On Monday 07 August 2006 05:57 pm, Tony Duell wrote:
We have four vehicles here, all with problems of one sort or another that are
currently sitting idle waiting for the funds to fix them. One car was on the
road until yesterday when it was shut off and refused to restart, and when I
looked it over (some miles away from here unfortunately) it appeared to be
getting fuel but no spark. And thanks to the electronics that's as far as I
could go with it.
On Sunday 06
August 2006 07:43 pm, Chuck Guzis wrote:
YEs. I have several workshop manuals that cover the Borg-Warner 35
transmission (this was the common automatic transmission used on UK cars
in the 1970s). It really is a clever design. The hydraulic pump, driven
by the engine, is not just used to provide the pressure to operate the
clutches and brake bands, said pressure is also used to move valves
against spring pressure. The faster the engine turns, the more pressure
you get from the pump, and at a certain point the valbe moves far enough
to select some other function.
The better manuals explain exactly what happens for each gear shift...
Get yourself a good book on fluidics. IIRC, a
fluidic computer was
supposed to replace electronics in rugged environment situations.
Isn't that how an automatic transmission is supposed to work? Although
they apparently have electronics in the newer ones...
Alas yes. My father has just got a new car with electronics everywhere
:-(. There's a control unit for the (automatic)
gearbox. According to the
workshop manual, there are 6 solenoid valves inside the gearbox, and also
a manual slide valve coupled to the selector lever. Alas it doesn't
explain what the latter does (if it fails you change the whole valve
block),
Here I've heard that portion referred to as "valve body".
it doesn't explain what each of the solenoids does
(it does give
the dC resistances and the pins on the conector that each solenoid is
linked to so you can find a defective solenoid)
Oh well. I don't suppose I'll ever have to get amongst this, but it would
be interesting to know what's going on.
I have a van sitting out back which has a real problem in that regard, you
put it in gear and nothing whatsoever happens as far as any motion is
concerned. And it's new enough to have one of those electronic transmissions
which I believe got seriously overheated at some point. I'm sure that the
fluid that I checked is not supposed to be as black as motor oil turns out to
be at times. And either getting that one fixed or even getting one from a
junkyard is looking to be a very expensive proposition, unfortunately...
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that can
be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin