Posted by Paul (in NY) [12.64.180.167] on Thursday, November 07, 2013 at 13:51:57 :
In Reply to: Lets talk injection pumps posted by Mike Hernke [63.151.218.18] on Thursday, November 07, 2013 at 09:53:01 :
Actually you have your terms reversed, ie Load or Speed governor.
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Referring to the Book, Diesel Engine Management, by Robert Bosch Gmbh (who builds the Cummins, and other s Injection pumps and control systems;
Page 22
Engine Speed Limits
" Diesel Engines that drive machinery are expected to maintain a constant speed or to keep their speed within a certain upper and lower limit regardless of load supplied. For such requirements, there are variable load speed governors.
On Diesel engines used to drive road-going vehicles, the engine speed must be infinitely variable by the driver using the accelerator pedal. In addition, when the engine is under load or when the accelerator pedal is released, the engine speed must not be allowed to drop below, the idling speed to a standstill. Idle-speed and maximum speed governors regulate only the idling and maximum speeds. The intermediate range of speeds is controlled totally by the accelerator pedal. "
Robert Bosch Gmbh
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A load governed engine is designed to maintain a 'design' RPM for its application, such as a pump or generator or a Engine driving a hydraulic pump as on equipment.
Typically this 'design' RMP is around 1800 RPS, but may vary. Its possible in mess'n with the governor springs to pull the 'design' rpm down to idle, and then use the accelerator pedal to control engine speed.
The danger is so doing, according to Robert Bosch Gmbh is that you loose top rpm control and the engine can be run to a critical speed and potential destruction. The speed governed engine for road use
limits its maximum engine rpms so it does not reach the critical speed above that which the engine was designed to run.
Even though your engine came out of a bread truck, one of two things are possible;
The engine complete was swapped out by the mechanics who also 'worked' on the governor springs to make it drivable on the road. Or just the injector pump was swapped for some reason.
Have you checked your CPL/Serial to be sure its not a complete industrial engine. Typically industrial engines dont have piston oil squirters and other parts are different. Its not just EPA certification, its how the company (Cummins) Built the engine and for what purpose.
If you dont have documentation to check your CPL, post it here and i will try to look it up in my Doc files. Then you know for sure what your dealing with.
Paul
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