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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:
Caterpillar 3208 (Engine)
LUBRICANT: MIL-L-2104
Fe
Ag
Al
Cr
Cu
Si
Sn
Ni
Pb
Mo
Mg
30-
0-10
0-3
0-20
0-20
0-25
0-20
Normal Range
150
151-
Marginal Range
11-15
4-12
21-27
21-35
26-40
21-27
230
231-
16-45
13-20
28-35
36-50
41-75
28-35
High Range
300
Abnormal
301
46+
21+
36+
51+
76+
36+
Abnormal Trend
(PPM Increase
60
9
4
7
10
15
7
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 silicon 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.
Molybdenum (Mo) levels can be employed to determine the
condition of the top (fire) ring. Molybdenum may be present
as a dry lubricant or as an additive in some greases, requiring
evaluator interpretation.
The engine is liquid-cooled; therefore, ethylene glycol may be
present in the engine oil, indicating coolant contamination.
Lead (Pb) is normally generated at relatively high levels
during the break-in period of the engine, and then remains
fairly constant except for heavy loading, marginal lubrication,
or excessive dirt. Increased lead can be the first symptom of
bearing distress.
APPLICABLE END ITEMS
613WDNS, 613WDS, 613SNS, 613SS, K300

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