Posted by MarkB_MI on February 10, 2021 at 06:42:12 from (174.230.0.171):
In Reply to: Diesel run a way posted by Steve Metcalfe on February 10, 2021 at 06:26:40:
There are a number of things that can cause a diesel engine to "run away". In general runaways happen when fuel enters the combustion chamber and can't be shut off. It could be entering via the injectors, or it could be ingested through the intake. A common example of fuel ingestion through the intake is if someone cleans an oil bath air cleaner with gasoline or solvent and doesn't get it dry afterwards.
My dad and his crew experienced a runaway D7 Cat engine nearly fifty years ago after they overhauled it. My dad wasn't happy with how he thought it was pulling and decided to mess with the injection pump rack while it was running. This turned out to be a colossally bad idea, as the rack became unhooked and all four injectors screwed full on. This tractor didn't have a functioning fuel shutoff and they always stalled it to kill the engine. Dumping the clutch with the transmission in gear simply blew the clutch out. At this point they figured the engine, which normally ran around 1100 rpm, was turning over 7000 rpm. After a couple of very harrowing minutes, they managed to pinch off the fuel line and kill the engine. The motor was pretty much trashed; Dad found a old irrigation pump motor to replace it. That dozer is now owned by the son of one of the men that was there that day, and he still uses it.
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