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 TM 55-1905-221-14-3
6-22.
POWER UNIT - MULTIPLE ENGINE REMOVAL - AN D RUN-IN INSTRUCTIONS
(Continued).
OVERHAUL (Cont)
Idle
1200 rpm
1800 rpm
2000 rpm
Lubricating Oil Pressure--psi
Normal ................................ .........................
30-60
38-60
40-60
Minimum for safe operation .........................
18
27
30
Air Box Pressure--inches mercury
(Minimum with zero exhaust
back pressure)
Full Load ................................ .....................
1.7
4.3
6.0
No Load ................................ ......................
0.5
1.6
1.8
Air Box Pressure--inches mercury
(Minimum with maximum exhaust
back pressure)
Full Load ................................ .....................
3.2
7.6
10.1
No Load ................................ ......................
1.3
4.2
5.0
Air Inlet Restriction--inches water
(Maximum)
Dirty Air Silencer ................................ .........
12.4
25.0
30.0
Clean Air Silencer ................................ .......
9.0
15.0
18.0
Crankcase Pressure--inches water
(Maximum)
6-71 engine................................ ..................
2.0
2.8
3.1
Exhaust Back Pressure--inches mercury
(Maximum)
Full Load ................................ .....................
1.5
3.3
4.0
No Load ................................ ......................
1.0
2.1
2.6
Fuel Pressure--inlet manifold--psi
Normal
.080" Restriction ................................ ..........
45-65
45-65
45-65
Minimum ................................ .....................
30
30
30
Fuel Spill, no-load-gpm (Minimum)
.080" Restriction................................ ...........
.8
.9
.9
Compression Pressure--psi at
600 rpm (at sea level)
Average, new engine ................................ ..
565
Minimum ................................ .....................
515
6-274
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