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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 VTA-903 (Engine)
LUBRICANT: MIL-L-2104
Fe
Ag
Al
Cr
Cu
Si
Sn
Ni
Pb
Mo
Mg
Normal Range
0-87
0-17
0-30
0-23
0-32
0-3
0-22
88-
Marginal Range
18-23
31-41
24-28
33-40
4-5
23-27
112
113-
24-28
45-52
29-36
41-49
6-7
28-33
High Range
140
Abnormal
141+
29+
53+
37+
50+
8+
34+
Abnormal Trend
(PPM Increase
13
3
7
8
6
2
2
in 10 hrs)
TECHNICAL INFORMATION
A faulty air induction system is normally the major source of
silicon in the 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.
Valve-guide wear will normally not show up in the engine oil
because it, along with guide lubricating oil, will be exhausted
during operation of the engine.
APPLICABLE END ITEMS
9125TC, LVTR-7A1, M2, M3 M320RT, M9, M993
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