Check Engine no cranking, cranks but fails to start, hard starting, and starts but does not continue to run problems; determine needed action.
Lesson Plan for
DIT 110-111Introduction to Diesel Engines
Course HS Title: / INTRO TO DIESEL ENGINE / Program:KCTCS Courses included in HS Title: (Lesson is prepared for course highlighted.)
KCTCS Course No. / KCTCS Course Title
DIT 110 / Introduction To Diesel Engines
Introduction/Context / This lesson will instruct students on how to check engine no cranking, cranks but fails to start, hard starting, starts but does not continue to run problems, and determine needed action. Knowledge of these techniques, and the skills required to correct problems associated with this task are necessary for a student to learn if they wish to compete for high paying, high skilled jobs in a Diesel/Medium-Heavy Truck repair facility. Students need to be able to perform these tasks with 100% accuracy. Incorrectly performing these tasks can lead to engine concerns, safety problems, or create customer satisfaction issues.
Prepared By / School / Date:
Grade Level / No. Students / No.IEP's: / Lesson Length:
Task
Identify causes of no cranking, cranks but fails to start, hard starting, and starts but does not continue to run problems; determine needed action.
Objective
Given the proper tools and instructions, students will be able to identify causes of no cranking, cranks but fails to start, hard starting, starts but does not continue to run problems, determine needed action, and pass a written exam on the task with 100% by the end of the course.
Connections
Skills Standards:OH 001
OH 002
OH 003
OD 002
OD 003
OD 005
Common Core Technical Standards:
TD-SYS-2
New Common Core Standards:
RST 11-12.2
RST 11-12 3
INSTRUCTIONAL MATERIALS/TECHNOLOGY
Teacher Designed Materials and Other Handouts
Instructor may use the content section of this plan to create a handout for the students.
Textbooks and Workbooks
Kershaw/Bennett / Medium/Heavy Duty Truck Diesel Engines / 2001 / Delmar / 435
Don Knowles / Medium/Heavy Duty Truck Technician Certification Manual / Second / Thomson Delmar / 102-103
Equipment
As Needed / Scan Tool / Various.
Content/Presentation/Demonstration Outline
Explain to students that when dealing with an ENGINE WILL NOT CRANK problem, they should first determine whether the problem is related to the cranking circuit (electrical or pneumatic problem) or a mechanical engine condition. Tell students to focus on the cranking circuit first and eliminate any obvious causes. Let them know that in most cases, the cause of a failure to crank will be found here.
Next, instruct students to attempt to bar the engine over by hand. If it cannot be turned over, tell them to check the engine externally and both the transmission and power take-off (PTO). If engine seizure is suspected, have them remove all the injectors, and again attempt to bar the engine over by hand before beginning to disassemble the engine. Teach students that if disassembly is required, carefully remove and label components so that the cause of the failure can be determined.
Instruct students that when an ENGINE CRANKS BUT FAILS TO START, it is often an indication of air in the fuel system. Tell students that to determine if air is causing the problems, pressurize the system using a hand primer and bleed the lines to each injector while cranking the engine. Teach them that if air is found, examine the area around the fuel lines between the primer and injectors for an accumulation of fuel. Inform students that if the primer pump fails to build up pressure within the required time, they should check fuel filter lines for leaks and the tank for adequate fuel level.
Explain that a diesel engine MAY NOT START OR BE HARD TO START because the temperature of the air in the cylinder is too low for full combustion of the atomized fuel. Instruct students that if the starter does not rotate the engine fast enough to allow the air in the cylinders to reach combustion temperature, combustion will not occur.
Teach students that electrically, the starter may turn slowly if it is defective, or if it has a low battery voltage, corroded cables, or high-resistance electrical connections. Tell students to inspect the starter, battery, and connections to ensure proper operation of the starter motor.
Instruct students that mechanically, the engine may offer too much load on the starter. Let them know that this happens when the oil is too thick. Teach students to check oil specifications for the climate zone, and check immersion heaters if installed.
Tell students that low combustion temperature also may result if the outside temperature is too low and the engine does not use preheating. Inform students that to maintain a warm engine for starting at low temperatures, the engine may use an immersion heater in the cooling system or submerged in the crankcase oil.
Applications/Practice
Evaluation and feedback Prior to Testing or Lab Work
STUDENT ASSESSMENT:(Assess student progress with performance criteria.)
IMPACT--Reflection/Analysis of Teaching and Learning: (How did students’ progress in relation to the state objectives? Was the instruction successful? Analyze samples of student work particularly that which is unsatisfactory, for the purpose of planning further instruction.)
REFINEMENT--Lesson Extension and Follow-up: (To be filled in as the lesson is modified during initial planning and/or during the teaching learning process.)