159 (6) S Heavy-Duty Unit II Power Transmission Continuation of HDM 158. Covers ... of servicing, involving major power transmission components found in the heavy truck ... relate to each other as well as the diesel and heavy equipment industry. HDM 162 ... HDM 101 or permission. HDM 176 (6) S Diesel Engines Basic Provides basic working ... knowledge of diesel engines in trucks and equipment used ... manufacturers manuals. HDM 177 (5) S Diesel Engines Study of two-stroke Detroit ... diesel engines. Covers principles of ... in field of mechanics. HDM 178 (5) S Diesel Tune-up Designed to upgrade the ... mechanic in the principles of diesel engine tune-up. Prereq: Permission. ... HDM 179 (5) S Cummins Diesel Engines Study of operation, maintenance ... , rebuild, tune-up and testing of Cummins diesel engines. Prereq: Apprentice or ...