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Page Title:
Continental AVDS 1790-2A/2C/2D/ (Engine) |
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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:
Continental AVDS 1790-2A/2C/2D/ (Engine)
LUBRICANT: MIL-L-2104
Fe
Ag
Al
Cr
Cu
Si
Sn
Ni
Pb
Mo
Mg
Normal Range
0-99
0-6
0-43
0-10
0-50
0-60
0-8
0-6
0-30
0-14
100-
Marginal Range
7-9
44-63
11-14
51-65
61-85
9-12
7-8
31-42
15-20
145
146-
86-
High Range
10-11
64-82
15-18
66-85
13-15
9-10
43-55
21-26
185
110
Abnormal
186+
12+
83+
19+
86+
111+
16+
11+
56+
27+
Abnormal Trend
(PPM Increase
37
3
16
4
17
22
4
3
11
5
in 10 hrs)
TECHNICAL INFORMATION
The AVDS 1790-2A engines in the field are being modified to
AVDS 1790-2D. AVDS-1790-2C/2D/2/DR engines are classified
as Reliability Improvement Selected Equipment (RISE) versions of
the engine. The RISE engines retain 10 gallons less residual oil
after oil drain than the unmodified engines.
A faulty air induction system is the major source of silicon in
engine oil. Silicone coatings may also be used in oil-wetted engine
parts. Aluminum and cast iron parts in the engine can have
significant amounts (up to 13.5%) of silicon in their composition.
When the rear main seal in an AVDS 1790 engine attached to a
CD 850-6A transmission wears excessively or ceases to function
properly, there will be cross-contamination of the engine and
transmission lubricants. This, in general, will be indicated by
increasing or high copper (Cu) and lead (Pb) in the engine oil
samples and, simultaneously, increasing or high molybdenum
(Mo) in the transmission oil samples.
The engine is air-cooled; therefore, no
liquid
coolant
contamination problems should be experienced.
Aluminum and iron particles from both wear and machining are
commonly found in the oil pan.
Aluminum-Silicon
Piston wear or piston and cylinder wall wear. Could also be derived
(Al-Si)
from machining chips left in engine.
Iron
Wear of cylinder walls. Wear of numerous other engines parts. Also
(Fe)
from machining chips left in engine.
Oil control rings are surfaced plated with chromium.
(Cr)
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