A number of years ago my father worked as a salesman for a Lincoln/Mercury
dealership (people bought used cars over the phone on his word - several more
than once) and I often hung around the dealership between college classes.
Sometimes I delivered the cars Dad sold to remote parts of Oregon.
During one such visit to the dealership the mechanics decided to try the water
trick on a 55 Merc engine they planned to tear down and rebuild for the owner.
They were careful in adding water through the carburetor because they were
concerned about cracking the heads. After the water process was completed the
engine was removed and disassembled. The interior of the cylinders looked very
clean and shiny as though steam cleaned (which they were) and there was no
carbon
anywhere inside of the cylinders.
It is also my understanding that excessive carbon buildup (low RPM's????) for
some reason could cause ignition after shutting off the engine. Setting the
idle
too fast can have the same result.
Tom
69 2000
Portland
Fred Schroeder wrote:
> Timing has nothing to do with dieseling. Once the key is turned off you
> have no ignition. Could be the gas or carbon build up. Carbon deposits
> glow red hot and keep igniting the gas just like a glow plug engine. A
> better grade of gas might help. I've been told that a lean mixture can
> cause it although I've never experienced it personally.
>
> I had a 302 Ford do this one time. A friend told me about a way to clean
> it. Keep the engine speed up and pour ice cold water through the carb. Do
> it as fast as possible and still keep the engine running. (Could be a trick
> with side drafts!) After pouring a pitcher of water through it, I punched
> the throttle a few good times. You simply wouldn't believe the crap that
> came out! It looked like someone shot off a black powder cannon.
> Apparently, the thermal shock of the cold water causes the carbon to loosen
> and be expelled through the exhaust. Whatever the explanation, it took care
> of the carbon problem.
>
> Best regards,
>
> Fred Schroeder
> '70 2000
> SRL311-13359
> TDROC
> Home page http://home.texoma.net/~sitsinwest/
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