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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 NTA/NTC 400 (Engine)
LUBRICANT: MIL-L-2104
Fe
Ag
Al
Cr
Cu
Si
Sn
Ni
Pb
Mo
Mg
Normal Range
0-57
0-15
0-9
0-62
0-31
0-35
Marginal Range
58-70
16-18
10-11
63-76
32-38
36-43
High Range
71-88
19-22
12-13
77-95
39-47
44-54
Abnormal
89+
23+
14+
96+
48+
55+
Abnormal Trend
(PPM Increase
4
2
2
4
3
3
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
silicon in their composition.
Piston rings and cylinder liners normally show 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.
Wear of end-thrust washers in turbocharger will permit rubbing of
the turbocharger hot wheel against the turbocharging housing. This
in turn will produce chromium, iron, nickel, and copper in the
engine oil.
APPLICABLE END ITEMS
D63, M915, M915A1, M916, M917, M918, M919, M920
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