Most diesel electrics are started from the dynamo. Some connections are
switched and the engine is excited.
On Thu, 13 Jun 2002, Tony Duell wrote:
Quothe Tony Duell, from writings of Thu, Jun 13, 2002 at 01:55:45AM +0100:
[quoting ?]
The only
time I've seen this is on the Ford type starter where
the pull in for the gear comes from a pole piece in the started
Pre-Engaged starter motors (that's to say, ones where the solenoid moves
the pinion into mesh before turning on the motor, as opposed to some
device that moves the pinion into mesh when the motor turns, like the old
'Bendix' drive or the ones where the armature moves along the body of the
['old' Bendix drive? :-)]
Well, OK, this _is_ classiccmp were people like old (and solid) designs
:-).
At one time (1940s?) there was an idea in the UK to used a single machine
as both the starter motor and dynamo (DC generator). It was generally
chain-driven from the crankshaft, and I think it had separate
windings for the 2 functions. The problem was finding a gear ratio
between the machine and the engine that (a) let the engine turn fast
enough to start and (b) didn't cause the electrical machine to fly apart
when the engine was running at maximum speed.
As far as I know, Ford starters use a separate starter solenoid,
mounted above the inner fender, above the passenger-side front tire,
about a foot or so away from the battery. The starters themselves use
a Bendix spring to engage the starter. A common failure, causing many
mechanics to sell people new batteries, new starters, new voltage
regulators, new solenoids, etc. is when the screws holding the
solenoid to the frame become a little too loose, or if there's some
oxidation/rust there causing a bad connection to the frame. Also, it
Now you mention it, I cured just that fault on a UK-built Mini not too
long ago. An idiot garage [1] had fitted the wrong battery which meant
the leads weren't long enough. They'd 'cured' this by bolting the
(separate) starter solenoid to the frame with one screw only. It had come
loose, the starter didn't operate. Of course I fixed it properly....
[1] Is there any other kind? In the UK most garage mechanics make
computer field servoids look clueful. I knew there was a reason why we do
all our own servicing and repairs :-)
helps to use a piece of high temperature hose, or
asbestos tubing,
around the cable leading from the solenoid to the starter; this
prevents the passenger-side exhause manifold, or headers, from melting
the insulation on the cable... when that happens, some mechanics try
to sell people new batteries, starters, etc. rather than just
Like field servoids, garage mechanics like swapping out parts without
bothering to do tests to find out what the real problem is.
replacing, or better insulating, the cable.
Disclaimer: as to those newfangled Fords made after the 1970s, I've no
idea what sort of peculiar things go on under their hoods (bonnets),
and I don't really want to know, but I hear that some don't even use
spark plugs, distributors or carburators. All of the new (post 1970s)
This is true. But some pre-1970 cars don't either (Diesel engines were in
use before 1970 :-)). Of course many modern cars have far too many
electronic computers in them (the correct number, of course, is zero).
motorcars are too strange for my tastes; weird
machines, extremely
There is nothing wrong with weird machines. I happen to like the Citroen
DS, which is certainly _strange_. The 6V models (1959 version if I
remember the shop manual correctly) don't even have an HT distributor....
There is a lot wrong with 'solving' problems by adding unnecessary
complexity.
weird and overly complex, and cheaply built,
machines with expensive
price tags.
Have engineers forgotten how to design things that work properly while
not being overly complex? It appears that needlessly complex gadgetry
has replaced functionality.
I believe that I.K. Brunell once said 'Any third-rate engineer can make a
complicated device even more complicated. It takes a genius to go back to
first principles'. From what I can see, there are a lot of 3rd-rate
engineers out there at the moment.
-tony
M. K. Peirce
Rhode Island Computer Museum, Inc.
Shady Lea, Rhode Island
"Casta est quam nemo rogavit."
- Ovid