EMD 645

The EMD 645 is a family of diesel engines built by General Motors Electro-Motive Division for locomotive, marine and stationary engine use. Chronologically the 645 series falls between the earlier 567 series and the later 710 series, but it is still supported by EMD.

History

The 645 series engine introduced in 1965 was a developement of the earlier 567 engine. It had a larger bore, 91⁄16 inches instead of 8½ inches but maintained the same stroke. Engine speed was also increased, from 800/835 to 900 rpm. It was first used in EMD's "40 series" (GP40, SD40) in 3000 hp 16 cylinder form, and in 20 cylinder, 3600 hp form in the SD45. The last locomotives the 645 was installed in were the "50 series" (GP50 and SD50) in 1985.

Specification

All 645 engines are 2-stroke 45° V-engines. Each cylinder is of 645 in³ (10.57 l) displacement, hence the name; with a bore of 91⁄16 inches (230.2-mm), a stroke of 10 inches (254-mm) and a compression ratio of 14.5:1. The engines are fitted with either a single or twin Roots blower, or a mechanically assisted Turbocharger depending on required power output

• Rotation (facing rear of engine): Counterclockwise
• Firing order
  • 8-cylinder: 1, 5, 3, 7, 4, 8, 2, 6
  • 12-cylinder: 1, 12, 7, 4, 3, 10, 9, 5, 2, 11, 8, 6
  • 16-cylinder: 1, 8, 9, 16, 3, 6, 11, 14, 4, 5, 12, 13, 2, 7, 10, 15
  • 20-cylinder: 1, 19, 8, 11, 5, 18, 7, 15, 2, 17, 10, 12, 3, 20, 6, 13, 4, 16, 9, 14
• Exhaust valves: 4 per cylinder
• Main bearings
  • 8-cylinder: 5
  • 12-cylinder: 7
  • 16-cylinder: 10
  • 20-cylinder: 12
• Fuel injection: Unit injector with needle valve
• Engine starting
  • AC traction generator: Dual electric starting motors
  • DC traction generator: Generator field
• Weight (E3B turbocharged models)
  • 8-cylinder: 22050 lb (10.0 tonne)
  • 12-cylinder: 28306 lb (12.8 tonne)
  • 16-cylinder: 36425 lb (16.5 tonne)
  • 20-cylinder: 43091 lb (19.5 tonne)

Versions

ID	Number of cylinders	Induction	Max rpm	Power (hp)	Power (MW)	Introduced	Locomotive(s)
6-645E	6		900	750	0.6	1967	G6B
8-645C	8			1100	0.8		EMD G18AR, NZR DBR class
8-645E	8	turbocharged	900	1500	1.1	1982	GP15T, MP15T
16-645E	16	Roots blower	900	2000	1.5	1966	GP38, GP38-2, SD38, SD38-2
8-645E3	8	turbocharged	900	1650	1.2
12-645C	12			1650	1.2		EMD G22AR, NZR DC class
12-645E3	12	turbocharged	900	2300	1.7	1968	GP39, GP39-2, SD39
16-645E3	16	turbocharged	900	3000	2.2	1965	GP40, GP40-2, SD40, SD40A, SD40-2, SD40T-2, SDP40F,ATSF SD26
20-645E3	20	turbocharged	900	3600	2.7	1965	SD45, SD45-2, F45, FP45
16-645E3A	16	turbocharged	950	3300	2.5	1969	DDA40X (dual engine)
20-645E3A	20	turbocharged	950	4200	3.1	1970	SD45X
8-645E3B	8	turbocharged	904	1514-1666	1.1-1.2
12-645E3B	12	turbocharged	904	2380-2570	1.8-1.9		JT22CW
16-645E3B	16	turbocharged	904	3195-3390	2.4-2.5		F40C
20-645E3B	20	turbocharged	904	3765-3960	2.8-3.0
16-645E3C	16	turbocharged	904	3300	2.5		British Rail Class 59
16-645F	16	turbocharged		3500	2.6	1977	GP40X, GP50, SD40X, SD50
12-645F3B	12		954	2800	2.1		GP49

See also

• EMD 567
• EMD 710

References

• Pacific Southwest Railway Museum. The History of EMD Diesel Engines. Retrieved on May 11, 2005.
• John's Alaska Railroad Page. Locomotive roster. Retrieved on September 8, 2006.
• victorianrailways.net [Y class d/e locomotives]. retrieved on October 17, 2006.