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Navy NEC · Engineering

745B ALCO (251C) and General Motors EMD (645) Diesel Engine Technician

Current service use not established

This code is listed in the directory. Inclusion alone does not confirm current service use.

A Navy Enlisted Classification: a skill designation sailors hold in addition to their rating.

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Overview

An ALCO and General Motors EMD Diesel Engine Technician operates ALCO 251C and General Motors EMD 645 diesel engines. This technician performs organizational or intermediate maintenance on the engines and their associated auxiliary equipment.

Core Skills

  • Organizational and intermediate diesel engine maintenance
  • Diesel engine auxiliary equipment maintenance

Civilian Career Paths

Career associations are editorial assessments of the cited evidence, not an official crosswalk unless the evidence explicitly says so. O*NET supplies civilian occupation information, not proof of a military match. Related experience does not confer civilian qualifications. Tasks and tools below describe civilian work, not military training.

Bus and Truck Mechanics and Diesel Engine Specialists

Operating and maintaining ALCO and General Motors EMD diesel engines and associated auxiliary equipment provides directly relevant experience for civilian diesel engine maintenance.

How to prepare: Take hands-on commercial diesel diagnostic training that covers test instruments and an engine diagnostic platform such as Cummins INSITE.

What the civilian work involves
  • Use handtools, such as screwdrivers, pliers, wrenches, pressure gauges, or precision instruments, as well as power tools, such as pneumatic wrenches, lathes, welding equipment, or jacks and hoists.
  • Attach test instruments to equipment, and read dials and gauges to diagnose malfunctions.
Civilian tools and software (examples)
  • Cummins INSITE
  • Computerized maintenance management system software CMMS

Notes & Sources

Evidence for this guidance (2 documents)
  1. NAVPERS 18068F Vol II (NEOCS, Jul 2026 edition): NEC 745B

    [1] NEC entry "745B - ALCO (251C) and General Motors EMD (645) Diesel Engine Technician"; cached text line 17748; NAVPERS 18068F Vol II, 2026-07 edition

    Supports: Organizational and intermediate diesel engine maintenance, Diesel engine auxiliary equipment maintenance, Bus and Truck Mechanics and Diesel Engine Specialists (O*NET 49-3031.00)

  2. O*NET: Bus and Truck Mechanics and Diesel Engine Specialists

    [2] O*NET 30.3 occupational data

    Supports: Bus and Truck Mechanics and Diesel Engine Specialists (O*NET 49-3031.00)

Defense contractor jobs for 745B

Descriptions may be summarized for clarity. Verify all information with your branch career counselor or official military documentation before making career decisions.

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