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The series 53 was the engine that took the 51's place. The 53's were G.M.'s first diesel with valves, inline and V configuration were available (inline: 2, 3, 4) (6V, 8V). The 8V53's had a timing gear train problem. The gear train was to light for the valve train load, this was common for some 6V53's. G.M needed a bigger engine with more power.
The series 71 fixed the 53's timing gear problem and let Detroit make bigger engines with more power and torque. Series 71 came in many configurations (inline: 1, 2, 3, 4, 6) (6V, 8V, 12V, 16V, 24V)...
Series 92 was the new replacement truck engine, 71's were squeezed to the limit. The 92's were cheeper to run and more reliable. Came in 6, 8, 12, 16,24V configuration
Series 149's were made after W.W II for mining and other heavy uses in construction and marine. Came in 8, 12, 16,20V configuration
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