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 NAVAIR 17-15-50.4
TM 38-301-4
T.O. 33-1-37-4
CGTO 33-1-37-4
COMPONENT:
Cummins NHC 250 (Engine)
LUBRICANT: MIL-L-2104
Fe
Ag
Al
Cr
Cu
Si
Sn
Ni
Pb
Mo
Mg
Normal Range
0-189
0-24
0-27
0-31
0-48
0-73
190-
Marginal Range
25-29
28-34
32-39
49-60
74-90
233
234-
91-
High Range
30-36
35-42
40-48
61-74
291
112
Abnormal
292+
37+
43+
49+
75+
113+
Abnormal Trend
(PPM Increase
13
3
3
3
4
5
in 10 hrs)
TECHNICAL INFORMATION
A faulty air induction system is normally the major source of
silicon in engine oil. Antifoaming agents in engine oil normally
contain silicone which will give 3 to 7 PPM in new oil. Silicone
coatings may also be used in oil-wetted engine parts. Aluminum
and cast iron parts in the engine can have significant amounts of
silicone in their composition.
Piston rings and cylinder liners normally shown the most
significant wear during operation.
The engine is liquid-cooled; therefore, ethylene glycol present in
the engine oil would indicate a leak in the coolant system.
Aluminum-Silicon
Piston wear or piston and cylinder wall wear.
(Al-Si)
Oil control rings and first compression ring are chromium plated.
(Cr)
Chrominum-Iron
Ring and Cylinder liner wear.
(Cr-Fe)
Iron
Wear of cylinder walls. Wear of numerous other engine parts. Also
(Fe)
from machining chips left in the engine.
APPLICABLE END ITEMS
M809, M809A1, M810, M811, M811A1, M811A2, M812, M812A1, M813, M813A1, M814, M815, M816, M817, M818,
M819, M820, M820A1, M820A2, M821, M923, M924, M925, M926, M927, M928, M929, M930, M931, M932, M934,
M936, M939, M940, M941, M942, M943, M944, M945
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