Re: 55 hp YTM?

Posted by Mark Robke on April 19, 2020 at 10:58:27 from (71.31.155.101):

In Reply to: 55 hp YTM? posted by Geo-TH,In on April 19, 2020 at 04:44:19:

I retired (truck mechanic)a few yrs after the diesel after treatment came out. But what I was taught is the earlier versions with particulate filter only, made more soot(particulate), but less nitrous oxides(NOX), which is a big concern with air pollution. This has to do with injection timing and EGR valve timing. The next system has the particulate filter and another chamber where the Diesel Exhaust Fluid is injected. No more muffler. With the DEF system there is more nitrous oxide, but less soot. The DEF reduces the NOX. Timing is changed. With DEF the system requires less regenerations. The particulate filter collects the soot, and has sensors to measure input and output pressure difference, and temp sensors. When the restriction is too high, some engines inject fuel up stream of the filter, others richen the fuel to the injectors, and this raises the exhaust temp and causes the soot to burn off the face of the catalyst face inside the particulate filter. This turns the soot into ash and deposits it in another section of the filter. This ash has to be removed periodically. This is called regen. How often regens are required all depends on how the engine is used. Hotter exhaust from hard work is the best thing. Idling is bad for the system. Hot and cold weather plays a factor too. During a regen the exhaust gets extremely hot.
Semis no longer idle all night-they have small engines behind the cab to run its own a/c and heater system. Ecms are programed to shut the engines off after a timed limit when idling.
Cleaning the particulate filter is done by replacing with a factory reman. Some are made a solid unit and others are made sectional. Mark.

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