ASE H2 Diesel Engines (Transit Bus) case studies
ASE H2 Diesel Engines (Transit Bus) · Put your knowledge to work in context.
ASE H2, Diesel Engines, is one of the transit bus certification tests in the ASE program. It is aimed at technicians who diagnose, repair, and overhaul diesel powerplants in heavy-duty transit coaches, including the engine block and valvetrain, lubrication and cooling, air induction and turbocharging, fuel and engine controls, starting and charging, engine braking and emissions, plus the safety practices that surround all of it. The ASE H2 Diesel Engines (Transit Bus) case studies are 5 cases and about 2,240 words.
1Overheat at Highway Speed on a Transit Bus
A 2016 low-floor transit bus with a 6.7 L inline-six diesel and a charge-air-cooled cooling package reports intermittent overheating. The complaint only occurs on grades above 4% at road speeds over 55 mph with the A/C on.
512 words, about 3 min2Cylinder Contribution Test With a Misfire Under Load
A 2014 transit bus with a 6.7 L diesel has a steady misfire and a slight gray haze from the exhaust at idle that clears above 1,200 rpm. The MIL is on with a cylinder balance/contribution fault for cylinder 4.
456 words, about 2 min3No-Crank on a Cold Morning
A 2018 transit bus with a 6.7 L diesel will not crank on a 20 F morning. The dash shows 12.4 V at rest.
426 words, about 2 min4Regen Failures and Derate on a Route Bus
A 2017 transit bus with a 6.7 L diesel and DOC/DPF/SCR aftertreatment keeps setting a DPF restriction fault and going into derate. The bus runs a stop-and-go city route with frequent short trips.
430 words, about 2 min5Fuel Dilution and Low Power After Injector Service
A 2015 transit bus with a 6.7 L diesel had all six injectors replaced 3,000 miles ago. The bus now has low power, black smoke under acceleration, and rising oil level on the dipstick.
416 words, about 2 min