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Page Title:
Continental AVDS1790-8CR (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 AVDS1790-8CR (Engine)
LUBRICANT: MIL-L-2104
Fe
Ag
Al
Cr
Cu
Si
Sn
Ni
Normal Range
0-103
0-7
0-20
0-10
0-28
041
0-6
0-3
104-
Marginal Range
8-9
21-24
11-12
29-34
42-51
7-8
4
127
128-
10-12
25-40
13-15
35-66
52-90
9-11
5-6
High Range
158
Abnormal
158+
13+
41+
16+
67+
91+
12+
7+
Abnormal Trend
(PPM Increase
14
2
3
2
4
10
2
2
in 10 hrs)
Pb
Mo
Mg
Ti
Na
Zn
B
Normal Range
0-22
0-103
0-99
0
0-13
0-496
0-87
104-
100-
497-
88-
Marginal Range
23-28
*
14-16
127
122
610
107
128-
123-
611-
108-
High Range
29-40
1
17-19
158
152
763
134
Abnormal
41+
159+
153+
2+
20+
764+
135+
Abnormal Trend
(PPM Increase
4
32
30
1
4
153
27
in 10 hrs)
TECHNICAL INFORMATION
The AVDS 1790-8CR is equipped with a power take-off driveshaft employed to power the HH88A2 Hercules' vehicle
hydraulic system.
A faulty air induction system is one of the major sources of silicon (Si) 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 of silicon in their
The cylinder walls are impregnated with a ceramic material consisting of chromium (Cr), magnesium (Mg) and silicon (Si).
Significant increases in Cr, Mg, or Si wear material particles during operation may be an early symptom of cylinder wall
distress.
When the rear main seal in an AVDS 1790-8CR engine (attached to the XT1410-5A transmission) wears excessively or
ceases to function properly, there will be cross-contamination of the engine and transmission lubricants. In general, this will
be indicated by increasing or high copper (Cu) and lead (Pb) in the wear metal analysis readings of the engine oil samples
and, simultaneously, increasing or high molybdenum (Mo) in the wear metal analysis readings of the transmission oil
samples.
The AVDS 1790-8CR engine is air-cooled; therefore, evidence of ethylene glycol or other liquid coolants should not be
found in oil sample analysis data
Aluminum and iron particles from both wear and machining are commonly found in the oil pan.
Operation in cold and warm ambient environment conditions can affect the concentration of wear particles in oil sample
analysis data. During cold ambient operations, Cu readings may increase due to increased water contamination from
condensation. Additionally, cold ambient engine starting wear may increase for Fe, Cr, Pb and Al wear particle
concentrations.
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