School Bus Mechanic Archives

MaxxForce 7 Engine Code 3055

This MaxxForce 7 diesel engine gave us a bit of a challenge with intermittent engine shutdowns. The engine code 3055 (high pressure fuel pump related) led us to a solution in the way of a TSB (technical service bulletin). Apparently the wiring harness to the high pressure oil pump was causing a lot of headaches… Continue reading MaxxForce 7 Engine Code 3055

2018 Mercedes MBE 900 Engine Code 2631

After eleven years of operation it’s not surprising to find a worn out turbocharger. The tell tale sign was a very common engine code for these MBE 900 diesel engines. The SPN 2631 has appeared many times over the years and our shop knows where to look and what testing has to be carried out… Continue reading 2018 Mercedes MBE 900 Engine Code 2631

2013 MaxxForce 7 Diesel Engine Code 3055 Will Not Run

It all started back in 2013 when we purchased 8 International conventional school buses with the Navistar V-8 diesel engine known as the MaxxForce 7. I personally have never experienced a reliable V-8 diesel engine. Maybe it’s the designing around a V-8 engine block that makes it weak in some areas. One failure that was… Continue reading 2013 MaxxForce 7 Diesel Engine Code 3055 Will Not Run

Mercedes Diesel Engine Emissions Shop Talk

There is a substantial difference with emissions between 2007 diesel engines and pre 2007 diesel engines. Several add on components were designed to support the reduction of emissions. The older Mercedes in the video is your basic engine with turbocharger, charge air system and standard exhaust. 2007 required more emission reduction adding a diesel particulate… Continue reading Mercedes Diesel Engine Emissions Shop Talk

Mercedes Diesel Engine EGR Cooler Diagnosis

The EGR cooler is one of the most important components on a diesel engine these days since it controls the amount of exhaust that transfers from the exhaust system in to the intake system. Cooled exhaust funneled to the air intake reduces NOx (nitrogen oxide). You would not think raw exhaust would help reduce emissions… Continue reading Mercedes Diesel Engine EGR Cooler Diagnosis

MaxxForce DT Testing High Pressure Manifold

With the right fittings from your local hardware store you can test the injection high pressure manifold that can cause diesel performance problems on a MaxxForce DT when it develops an oil leak. As the video shows there is a substantial leak on this manifold. So we could have just removed the manifold and replaced… Continue reading MaxxForce DT Testing High Pressure Manifold

Mercedes MBE 900 Emissions EOS Code

This is a 2007 Mercedes MBE 900 diesel engine with an EOS electronic oil separator engine code. Once the separator has a restriction there is usually oil entering the intake and out the exhaust which of course is easily noticeable. Along with that an engine code will be indicated on the dash. The valve cover… Continue reading Mercedes MBE 900 Emissions EOS Code

MaxxForce 7 Running Check Engine Code

This problem was pretty straight forward using the Navistar Engine Software that led us directly to the problem. The engine code was the fuel rail pressure sensor. Most times it’s the sensor but due diligence is in order here just in case there’s a bad wire end or poor connection down the line. This engine… Continue reading MaxxForce 7 Running Check Engine Code

Thomas HDX School Bus Road Test

I would like to follow up on this video. We changed the surge tank low coolant sensor and that fixed the problem with alarms and dash lights coming on. This problem did not happen all of the time. It’s a phrase used a lot in the mechanic world known as “an intermittent problem”. These are… Continue reading Thomas HDX School Bus Road Test

2007 International School Bus Parked Regen

Well it started out alright until I found out the soot level in the diesel particulate filter was at a level 5 indicated in the software readings. That is the maximum level which means the chances of cooking out the soot to conservative levels is probably not going to happen. In fact the regen never… Continue reading 2007 International School Bus Parked Regen

Website Managed By StableWP

Category: School Bus Mechanic