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Page Title: POTENTIAL SOURCES OF WEAR METALS TO AID TROUBLESHOOTING (Cont)
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NAVAIR 17-15-50.3
TM 38-301-3
T.O. 33-1-37-3
CGTO 33-1-37-3
ENGINE:
F110-GE-100 (Cont)
AIRCRAFT: (F-16)
d. Increasing Cr may indicate the inner race may be spinning on the number 4 and 5 bearing journals.
e. An abnormal rise in Fe may indicate loose No. 3 bearing locking nut; this may be accompanied by rises in
Ti or Ni.
2. Accessory items:
a. Lube and scavenge pump distress may be indicated by increasing trends in Fe and Cu together. Al may
accompany the Fe and Cu.
b. Following hydraulic pump replacement, a rise in Cu level may be expected during the break-in period (10-
12 engine flight hours (EFH)). This trend will continue to rise during this period. A rise in Cu (3 ppm emission) in
15 EFH may indicate hydraulic pump head port relief valve failure. Troubleshoot per applicable technical order
(2J-F100-3-9, 2J-F110-6-4, 2J-F110-6-13, or 1F-16CJ-70FI-00-11 for the F110-GE-100).
c.
Boost pump bearing distress may be indicated by increasing trends in Cu and Zn together.
3. Gearbox:
a. Increasing trends in Fe may indicate gearbox problems. Mg and Ag wear metals may accompany the
increase in Fe.
b. Chrome plating may be used for repair of gearbox bearing journals. Increasing Cr may indicate the
bearing race may be spinning on the journals.
4. Miscellaneous:
a. High Si indicates oil contamination, possibly from the oil servicing cart. The oil servicing cart shall be
checked for contamination and, if contamination is confirmed, shall be drained and flushed. The engine shall be
drained and flushed to remove Si contamination. Post maintenance samples from the engine and oil servicing
cart, if applicable, shall be analyzed by the OAP laboratory to assure all Si contamination has been removed.
b. Indications of Pb are not indicative of a need for further troubleshooting. Pb residue is a result of the tube
forming process.
c.  Increase or abnormal oil levels in Zn or Mo, with no significant accompanying wear metals are not cause
for engine removal however, when abnormal trends or levels occur for Zn or Mo, the oil cart shall be checked for
contamination.
d. A rise in Ag accompanied by a rise in Zn, Mg or Cu can be an indication that the engine has been
contaminated with automotive oil (10W30, 10W40, etc.). Ag, Zn, Cu and Mg should stabilize after the engine has
been drained and flushed. An Ag trend without Mg or Zn, or one which does not stabilize after the drain and flush
is an indication that an engine bearing is deteriorating. Zn levels may remain high after the 10 flight hours of local
operation. This is normal provided there is a general decreasing trend in Zn levels. Automotive oil contamination
will not cause significant damage to oil system components. The oil servicing carts should also be inspected for
contamination. Carts found to be contaminated should also be drained and flushed.
NOTE
For unusual conditions not covered by this technical order or for technical assistance,
contact OC-ALC/LPAAT at DSN 336-7714, commercial (405) 736-7714.
A-84

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