Re: Sometimes the valve guides?

Posted by jdemaris on May 23, 2006 at 12:56:39 from (69.67.226.105):

In Reply to: Why does diesel run with key off? posted by Quebec Bob on May 23, 2006 at 09:01:52:

A diesel with mechanical injection usually has one of two different methods of shut-down. The most common being a fuel shut-off - either operated with an electric solenoid or mechanically with a cable or pull-rod.
Some older diesels used an air-choke instead of a fuel shut-off - e.g. Mercedes diesels in cars, the emergency shut-off in Detroit Diesels, etc.
Back in the late 60s, there was a Mercedes dealership next-door to the Deere place I worked at. I was told stories by Mercedes mechanics about "run-way" Mercedes diesels that could not be shut off. In brief - the story went - the Mercedes diesel used an air-choke for shut-down - like in a 190D. When an engine got worn, sometimes when an attempt was made to shut the engine down, the engine would suck crankcase oil through worn valve guides and keep on chugging away. If it was a stick-shift it could be stalled out. But - with an automatic -not so easy.

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