Different types of vehicles, and different brands of diesels, have different ways to shut down the engine. But in 45+ years of experience with car/trucks, forklifts, construction machinery, and boats they all shut down by interrupting the fuel supply.
On cars and trucks (my old Rabbit, for example – and I presume the Pathfinder diesels), many forklifts (with Mitsubishi, Yanmar & Cummins engines), and a goodly selection of construction machinery (dozers, excavators, etc) that are started and stopped by a key switch – they are generally wired as Shawn suggests. Key on activates a lift pump and opens a solenoid valve to allow fuel flow to the high pressure injection pump. Key off shuts down the lift pump and closes the fuel supply off. Newer high pressure common rail systems (Cummins, for example) generally are wired this way. I retired 9 years ago and, unfortunately, I’ve forgotten how the Perkins system works. On the recent generations of Universal and Beta diesels (which are derived from Kabuto tractor engines) there is a fuel shutoff built into the inlet port of the Japanese built Bosch injector pump. My 36HP Universal came with the option of a pull wire to move a lever to shut off fuel to the pump, or a solenoid connected to a wire connected to the shutoff lever. A push button on the engine panel in the cockpit activates the solenoid. Charlie, that sounds like the system on your Beta. For most of the older Yanmars with which I have experience (1, 2 & 3 cylinders used in boats) have the throttle linkage set up so reducing the throttle lever below idle speed activates the shut off lever on what I presume is a Japanese Bosch injector pump. A friends J30, with a 2GMF18, had a badly adjusted throttle linkage and it was a bitch to slow the engine down without shutting it off. I much prefer a shut off pull lever. As Charlie said, you should know how to shut off your diesel when the normal system malfunctions. The rubber cap that holds the plunger into the solenoid on my Universal M35B came loose one day, and the push button would activate the solenoid… but there was nothing pulling on the wire to shut off the fuel supply. It takes a while to remove the companionway steps to look at the situation …. And even longer for me to figure out how the system worked. Rick Brass Washington, NC From: CnC-List [mailto:[email protected]] On Behalf Of Shawn Wright via CnC-List Sent: Wednesday, May 1, 2019 8:54 PM To: [email protected] Cc: Shawn Wright <[email protected]> Subject: Re: Stus-List Any diesel shut off If it has a Bosch rotary injection pump, as my new 35-2 with VW diesel does, the fuel supply is held open with a solenoid. Cut power to the solenoid (generally wired to the ignition on switch) and the engine stops (assuming it is running on fuel, and not oil vapour through the intake... In an emergency, this solenoid can be held open with a 9V battery, although I don't know how long it would last.
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