How To Become a Diesel Mechanic
Prepare for a Diesel Mechanic Career While Still in High School
- Study hard on the career path you would like to take before committing 100%.
- Obtain a high school diploma.
- Take classes that will enhance your knowledge on your topic.
Source: https://www.yumpu.com/en/document/view/59251381/how-to-become-a-diesel-mechanic
Train at a Reputable Post-Secondary Diesel Mechanics School
Where you receive your training is very important — look for a technical school whose diesel instructors have significant real-world experience fixing diesel trucks and diesel-powered equipment. There is no replacement for experience and the ability for the knowledgeable instructor to communicate clearly. This is essential to the learning process.
Source: https://www.lincolntech.edu/news/automotive/diesel-technology/how-to-become-a-diesel-mechanic
Diesel Engine Repair Programs
To become a diesel mechanic, a person is usually required to be at least 18 years of age and possess a high school diploma or GED. Continuing education is not typically required, though many community colleges and vocational schools offer diesel engine repair programs. Such programs, which take from six months to two years to complete, provide students with hands-on and classroom training. Some schools even offer job placement services to help beginning mechanics to find work.
While no specific license or certification is required to work as a diesel mechanic, many new workers choose to obtain special credentials offered by a nationally recognized organization, such as the National Institute for Automotive Service Excellence (ASE) in the United States. A mechanic with at least two years of experience can become certified by passing an ASE test. With certification, a mechanic becomes a more desirable prospect to potential employers and customers.
Source: http://www.wisegeek.com/what-does-a-diesel-mechanic-do.htm
Volunteer Your Time at a Local Auto Shop that Services Diesel Engines
While classroom training is valuable, according to the Bureau of Labor and Statistics, many technicians learn through on-the-job training. Supplement your education and your reading by volunteering at a local auto shop.
Offer your knowledge to your friends and family who have diesel vehicles and perform routine maintenance procedures on the cars. Keep your skills sharp by doing as much repair work and maintenance as you can on diesel engines.
Source: https://itstillruns.com/learn-diesel-mechanics-6147890.html

Informal Training
Informal training generally involves the individual obtaining work at a local garage as an untrained helper. While employed, he or she will be trained in diesel repair by qualified mechanics while assisting at other tasks.
As his or her skills improve, the employer will let the trainee start to work on more complex tasks until he or she is considered a fully trained diesel mechanic.
Additionally, it allows them to take advantage of training that is offered at a working garage, which can provide the trainee with practical training that he or she would be unlikely to receive elsewhere.
However, it can be difficult to find a garage that is willing to provide training for an unskilled candidate. In addition, this type of training often takes somewhat longer than formal training programs, as the trainee must continue to perform his or her other duties in addition to being trained as a diesel mechanic. Finally, other employers may be unwilling to hire an individual without any formal certification.
Source: http://www.dieselmechanicguide.com/how-to-become-a-diesel-mechanic/