1.3.2 Engine Operating Conditions
DETROIT DIESEL 53
4-53 TURBOCHARGED ENGINES
4-53 TURBOCHARGED ENGINES
2500 rpm
Lubrication System
Lubricating oil pressure (psi):
Normal ..........................................................................................................................
40-60
Minimum for safe operation ...........................................................................................
32.0
*Lubricating oil temperature (degr F.) - max.........................................................................
205-240
Air System
Air box pressure (inches mercury) - N70 injectors - full load:
Minimum exhaust back pressure (clean ports) ...............................................................
31.5-38.5
Maximum exhaust back pressure ..................................................................................
29.6-36.6
Air inlet restriction (inches water) - full load max.:
Air silencer ....................................................................................................................
20.0
Crankcase pressure (inches water) - maximum .............................................................................
1.0
Exhaust back pressure (inches mercury) - maximum:
Full load ........................................................................................................................
2.5
No load..........................................................................................................................
1.8
Fuel System
Fuel pressure at inlet manifold (psi):
Normal with .070" restriction ..........................................................................................
45-70
Minimum .......................................................................................................................
35.0
Fuel spill (gpm) - minimum at no-load:
.070 " restriction ............................................................................................................
0.6
Cooling System
Coolant temperature (degr F.) - normal .........................................................................................
160-185
Compression
Compression pressure (psi at sea level):
Average - new engine - at 600 rpm ................................................................................ 480
Minimum - at 600 rpm ................................................................................................... 430
*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 10 lower than the oil pan temperature.
1972 General Motors Corp.
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