TM 5-4310-389-14
Section II.
DIRECT SUPPORT MAINTENANCE
4-2 GENERAL. This chapter will describe maintenance to be performed on the engine and compressor assemblies
beyond authorized capability of lower levels. This chapter contains maintenance at the Direct Support Level as
authorized by the Maintenance Allocation Chart (MAC).
4-3 OPERATING PARAMETERS AND TOLERANCES . This section will contain an itemized list of manufacturer's
sizes and tolerances desired for the K-20.
Table 4-2. General Engine Data
Item
Data
Type
F2L912
Total Piston Displacement
115 cu.in. (1885 cu. cm)
Working Cycle
Four-stroke diesel
Combustion System
Direct injection
Bore
3,937 in. (100 mm)
Stroke
4,724 in. (120 mm)
Weight of Engine
517 lbs (235 Kg)
Direction of Rotation (when facing flywheel)
CCW
Rated Speed (max)
2500 rpm
Idle Speed (min.)
750 to 800 rpm
Compression Ratio
17:1
Compression Pressure
294 to 412 psi (20 to 28 bar)
Valve Clearance
Inlet
0.006 in. (0.15 mm)
Exhaust
0.006 in. (0.15 mm)
Firing Order
2-1
Timing Data Check (intake/exhaust valve
clearance)
0.006 in. (0.15 mm)
Inlet Opens
320 30' BTDC
Inlet Closes
600 30' ABDC
Exhaust Opens
700 30' BBDC
Exhaust Closes
32° 30' ATDC
Piston Clearance from Cylinder Head
0.039 to 0.047 in. (1.0 to 1.2 mm)
4-7
