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 TM 55-1905-219-14-4
ENGINE OPERATING CONDITIONS
V-71 N ENGINES (English)
1200 rpm
1800 rpm 2100 rpm
LUBRICATING SYSTEM
Lubricating oil pressure (psi):
Normal ...........................................................................................
35-55
50-70
50-70
Min. for safe operation............................... ....................................
25
28
30
* Lubricating oil temperature (decrees F.):
Normal................................................... ........................................
200-235
200-235
200-235
AIR SYSTEM
Air box pressure (inches mercury) - min. at full load:
At zero exhaust back pressure: ......................................................
1.1
3.8
5.0
At maximum full-load exhaust back pressure: ................................
2.3
6.4
8.2
Air inlet restriction (inches water) - full-load speed,
max.:
Dirty air cleaner ..............................................................................
12.4
25.0
25.0
Clean air cleaner ............................................................................
5.2
9. 1
11.5
Crankcase pressure (inches water) - max:................. ..............................
1.0
2.2
3.0
Exhaust back pressure (inches mercury) -
max.:
Full load .........................................................................................
15
3.3
4.4
No load ..........................................................................................
1.0
2.1
3.0
FUEL SYSTEM
Fuel pressure at inlet manifold (psi):
Normal (.080" orifice)................................ .....................................
45-70
45-70
45-70
Minimum ............................................... ........................................
30
30
30
Fuel spill (gpm) - min. at no load: ...................... .....................................
0.8
0.9
0.9
Fuel pum suction at pump inlet (inches mercury) -
max.:
Clean system......................................... ........................................
6.0
6.0
6.0
Dirty system .................................... ..............................................
12.0
12.0
12.0
COOLING SYSTEM
Coolant temperature (degrees F.) - normal ................ .............................
160-185
160-185
160-185
COMPRESSION
Compression pressure (psi)
Average - new engine at 600 rpm...................................................
565
Minimum at 600 rpm ............................ ......................................
515
* The lubricating oil temperature range is based on the temperature measurement in the oil pan at the oil pump
inlet.
When measuring the oil temperature at the cylinder block oil gallery, it will be approximately 10 lower.
F
3-278
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