Check programs at local colleges, universities and trade schools. Many schools have applied science degrees or certification courses for diesel mechanics. Enroll and take specific courses for diesel mechanics. Schools often have placement opportunities for graduates with local companies.
Apply for training programs directly with large trucking companies or bus lines. Large companies that have a constant need for qualified diesel mechanics often have their own in-house training. You may be able to work as an assistent or intern for pay while you learn.
Start work with a local school district or city fleet maintenance crew. Begin in any maintenance job offered and work your way into assisting the diesel mechanics. On-the-job training can turn into a long-term career.
Take commercial diesel mechanic courses from the National Institute of Auto Service Excellence (ASE) and become ASE certified as a diesel mechanic.
Take classes and obtain a commercial truck driver's licence for your state. Diesel mechanics are required to test drive the trucks and buses they service.