This is an important step with any rebuild. Cleaning and inspection must be carried out with care so nothing gets missed. The cylinder head was sent out to a local machine shop for testing and inspection. They needed the injectors to block the fuel galleries to allow for a pressure test. Everything including injector sleeves,… Continue reading DT Diesel Engine InFrame Parts Inspection
If you told me we would be rebuilding one of our MaxxForce engines in six years I would have laughed and then went into total denial. There’s no way a school bus carrying 60 or so children operating 4 to 5 hours a day would be enough to wear out a diesel engine. I could… Continue reading Diesel Engine In Frame MaxxForce DT
This was my first experience getting a tour through a tire retread plant. Kal Tire supplies our recaps for our bus fleet and they asked us to come down and see where it all happens. It’s a long process from start to finish and I can see why they do not want to find a… Continue reading Touring a Tire Retread Plant
As you can see the EGR cooler from this Navistar DT MaxxForce engine is massive and it weighs I’m guessing around 50 pounds. Why is it so large? Well the main reason was to circulate more cooled exhaust gases to the air intake system and reduce emissions to meet the demanding emission standards set by… Continue reading MaxxForce DT Diesel Engine EGR Cooler Failure
Over the years there have been some people who have commented to me that working for the government is a retirement job. In some areas perhaps but even though we’re not a retail garage the work is always there and always waiting. It’s still physically and mentally challenging trying to keep up with new technology… Continue reading School Bus Garage Monday Morning Repairs
Years ago… 20 to be exact when I started working for this school bus fleet we relied on land lines and 2 way radios to get a report on break downs. This was very inaccurate and you didn’t really know what the problem was until you physically got to the bus and visually checked out… Continue reading School Bus Fleet GPS Telematics
This repair has a long history of scenarios which ended up as a major engine repair. The head gasket on this 2008 Mercedes MBE 900 diesel engine has failed. That’s the least of possibilities. Another option would be a cracked head but I’m staying optimistic. One thing for sure the top end of these diesels… Continue reading Mercedes MBE 900 Diesel Engine Repair
This Cummins ISB diesel engine was running flawlessly for years. It’s a 2009 so seven years with a fairly decent service record is a bonus for the fleet. Eventually mechanical components do fail as most people know and this part was the VGT actuator. VGT stands for variable geometry turbocharger. I can tell you this…… Continue reading Cummins Code 2636 VGT Actuator
This bus is one of our older non emission diesel engines. It’s a 2004 Mercedes MBE 900 in a Thomas HDX pusher school bus. As soon as oil pressure is reached I flipped on the high idle switch to get away from over fueling with unburned raw diesel which is very unhealthy for components related… Continue reading Cold Start Mercedes Diesel Engine in a School Bus
The one advantage to a belt driven air compressor is the minimal labour to change it out. In this school bus with a MaxxForce 7 diesel engine built by Navistar the Bendix air compressor failed after three years. The oil went as far as the air tanks so this was a severe level failure. The… Continue reading MaxxForce 7 Diesel Engine Air Compressor Failure
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