This particular Mercedes diesel engine model is a 2008 and emission controlled. I can say for sure that any exhaust leaks on an emission controlled engine will create not only an engine code but also derated performance. Once the code shows it’s ugly icon on the dash nothing really feels different until over time it… Continue reading Mercedes Diesel Engine Exhaust Leak
I thought now would be a good time to celebrate my 20th year as a school bus fleet mechanic. I first thought is “how times have changed” it’s a familiar statement but so true from my perspective. 20 years ago I was working on hard wired diesel engines and buses without any high tech troubleshooting… Continue reading 20 Year Anniversary and Mechanic Memories
School bus preventive maintenance let me count the ways. There are many approaches a mechanic can take to looking after the modern day school bus and the old models as well. Technology has changed and so has procedures involved with making sure unexpected failures are held to a minimum. PM steps are small to large… Continue reading School Bus Preventive Maintenance
This is the first time I’ve ever seen a problem like this on an HDX pusher school bus model. The Thomas HDX pusher bus has printed circuit boards that relay all of the supply power to run the lights, heater motors and operating circuits. There are 3 circuit boards in total and troubleshooting requires a… Continue reading School Bus Electrical Fault
The video shows one of our mechanics grinding away at a rear suspension. This is one of the jobs you may be faced with when you become a commercial transport / school bus fleet mechanic. If you want an interesting job with lots of variety getting into this trade is the way to go. I… Continue reading The School Bus Mechanic Life
The Cummins ISB diesel engine is a great piece of machinery and my first choice any day. It comes with the Allison 2500 series automatic transmission in our conventional buses and they work together extremely well. Those 2 components have given us minimal breakdowns. I shouldn’t say breakdowns more like minor inconveniences. The 250 horsepower… Continue reading Cummins ISB Diesel Engine
The Ricon wheel chair lift featured in the video is a very well designed piece of equipment. They use hydraulics to operate the lift cylinders that stow and unstow, lift and lower the lift deck. Micro switches limit the amount of travel during each action. There are interlocks that don’t allow the lift to operate… Continue reading Ricon Wheel Chair Lift
NOTE: So no one will think I was just dumping coolant on the floor and in to the city drain system and with respect to the EPA….The video showing the leak in question is draining water on to the floor. It’s not coolant since it was all lost (somewhere on a barren logging road) at… Continue reading Coolant Leak MaxxForce 7 Diesel Engine
The EGR cooler on this MBE 900 diesel engine developed a massive exhaust leak. The cause was the rear elbow at the cooler had worked it’s way out of the housing which caused the problem. This produced a lot of wear at the EGR cooler housing where the steel sealing rings sit. There’s not going… Continue reading Mercedes MBE EGR Cooler
This particular problem is on a 2009 Cummins ISC diesel engine. This model is an inline 6 8.3 Liter running in a Thomas HDX pusher school bus. The amber light presented itself on a field trip but did not cause any running problems mainly because it was an emission code. When the onboard computer does… Continue reading Cummins ISC Diesel Engine Code 1899
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