TM 5-2420-230-24-2
B3.9 and B5.9 Series Engines
Specifications
Section E - Engine Identification
Page E-25
Engine Testing
Maintain the following limits (see note) during a chassis dynamometer test:
Intake Restriction (maximum)
Clean Filter:
Light-Duty .............................................................................................................. 254 mm H2O [10 in H2O]
Medium-Duty ......................................................................................................... 305 mm H2O [12 in H2O]
Heavy-Duty ............................................................................................................ 381 mm H2O [15 in H2O]
Dirty Filter:
Light-Duty ............................................................................................................................. 635 mm [25 in]
Medium-Duty ........................................................................................................................ 635 mm [25 in]
Heavy-Duty .......................................................................................................................... 635 mm [25 in]
Exhaust Back Pressure (maximum) Nonautomotive ............................................................ 76 mm Hg [3.0 in Hg]
Exhaust Back Pressure (maximum) Automotive with Catalyst
.. 152 mm Hg [6.0 in Hg] to 127 mm Hg [5.0 in Hg]
Back Pressure (maximum) Automotive without Catalyst ............. 114 mm Hg [4.5 in Hg] to 102 mm Hg [4.0 in Hg]
Oil Pressure:
Low Idle (minimum allowable) ................................................................................................... 69 kPa [10 psi]
Rated Speed (minimum allowable) ......................................................................................... 207 kPa [30 psi]
Fuel Inlet Restriction (maximum) ......................................................................................... 100 mm Hg [4 in Hg]
Fuel Return Restriction (maximum)
................................................................................ 518 mm Hg [20.4 in Hg]
NOTE: Due to variations in ratings of different engine models, refer to the specific engine data sheet for the particular
engine model being tested.
Batteries (Specific Gravity)
Specific Gravity at 27C [80F]
State of Charge
1.260 to 1.280
100%
1.230 to 1.250
75%
1.200 to 1.220
50%
1.170 to 1.190
25%
1.110 to 1.130
Discharged
Battery Cable Specifications
Cable Size
Nominal Resistance in Ohms
Maximum Total Length
(sum of both cables)
Gauge
Per Meter
Per Foot
12 VDC
24 VDC
Meter
Feet
Meter
Feet
4
0.000984
0.00030
NR*
NR*
2.03
6.7
′1.63
2
0.000615
0.000188
5.3
3.26
10.6
1
0.000492
0.000150
2.03
6.7
4.06
13.4
0
0.000386
0.000118
2.59
8.5
5.18
17.0
00
0.000292
0.000090
3.43
11.3
6.86
22.6
000
0.000232
0.000071
4.32
14.2
8.64
28.4
* Not recommended
L-577