School Bus Transmission Oil In Coolant Repair

Cooling System Disassembly – Remove Radiator To improve access to the radiator we removed the hood, charge air cooler and radiator assy. Before installing a new radiator the cooling system needs to be flushed out properly. The local rad repair shop recommended a low suds dishwasher detergent. “Calgonite” for instance would work in this case.… Continue reading School Bus Transmission Oil In Coolant Repair

School Bus Cummins ISB Head Gasket repair

Cummins ISB Head Gasket The Cummins 24 valve ISB in the video requires a new head gasket. This 2003 model year head gasket was leaking from the right front corner which is a common problem with these models. The head bolts have to be checked for stretch with a gauge that comes with the head… Continue reading School Bus Cummins ISB Head Gasket repair

School Bus Allison 3000 Automatic Transmission Fault Code Demo

Setting Up A Transmission Code for Output Speed Sensor  This is an Allison 3000 Series Automatic Transmission in a 1997 Thomas Pusher School Bus. I did a demo fault in the video to show you what happens when a code develops ….which in this case is a output speed sensor code. I made this code… Continue reading School Bus Allison 3000 Automatic Transmission Fault Code Demo

Cummins ISB Engine Code Water In Fuel

I found out some interesting information about this code involving the fuel / water separator. The wiring for both the coolant sensor and fuel / water sensor namely the ground is shared. When the code for the water in fuel sensor popped up it also triggered an engine coolant temperature code to flash as well.… Continue reading Cummins ISB Engine Code Water In Fuel

Snap On Video Scope

Featured in this video is one of my favourite specialty tools. The Snap-On Video Scope is extremely handy and really helps out when you can’t see certain areas on an engine or inside a cab. This tool has several uses: -Internal engine diagnosis -under-dash, inside door panels -under-hood -behind engine block -inside transmission housings -any… Continue reading Snap On Video Scope

Pusher School Bus Engine Running Cold – Cummins Diesel ISC Model

I was out looking at one of our pusher buses and checking it out for running cold. The ambient temperature at the time was around -16 Celsius. In the video the first thing to check on these pusher buses is the hydraulic drive engine fan. The have stuck on in the past because of the… Continue reading Pusher School Bus Engine Running Cold – Cummins Diesel ISC Model

Watch Real Grease Monkeys – Literally Speaking

This grease monkey video (I wonder if they’re certified?) promotes Castrol oil which we are using right now. The 15W40 and 5W30 is a semi synthetic with CJ4 specification in the 15W40. As you may already know the low ash engine oil is required for today’s emission controlled engines. If you found a barrel of… Continue reading Watch Real Grease Monkeys – Literally Speaking

Parker Hydraulic Fan Drive School Bus Pusher

All of the school bus pusher buses have hydraulic drive engine fans. They have their advantages which includes cold start override which cuts down on the engine load and decreases warm up time. Fan Drive Fault – Staying on Constantly Right now we have a pusher bus that has an engine fan that stays on… Continue reading Parker Hydraulic Fan Drive School Bus Pusher

School Bus Shop Photos

These are photos I’ve been taking throughout the years at our school bus garage. As you may have noticed some of the technology is older. The Kysor Engine shutdown system was in our mid 1990 models. They served their purpose and was very basic with a coolant temperature sensor and oil pressure sensor hard wired… Continue reading School Bus Shop Photos

School Bus Module and Mercedes Diesel Engine Code Problem

Voltage Leakage with Interface Modules Another problem we are dealing with is the VIM vehicle interface modules especially on the HDX Thomas pusher buses. They are exposed to the elements and attract corrosion and since they have cooling vents to the atmosphere this causes voltage to creep over and energize other circuits. On one of… Continue reading School Bus Module and Mercedes Diesel Engine Code Problem