MIL-DTL-46796D
4.6.9 Oil. To determine conformance to 3.4.4, verify that the engine shall operate
without damage during all testing specified herein using oil as specified. Reference grade oil
required for the endurance test (see 3.5.12) shall be designated as follows:
Grade
Government designation
10
MC-1065
30
MC-1066
40
MC-1115
4.6.10 Performance. Unless otherwise specified all tests specified herein shall be
conducted on an engine dynamometer.
4.6.10.1 Engine break-in run. In conformance with 3.5.1, each engine shall be operated
through the break-in run schedule developed by the contractor (see table VI). The break-in run
shall be conducted on all engines prior to further testing. Any unsatisfactory operations or
conditions which require correction shall be corrected by the contractor before the engine is
presented for further testing.
4.6.10.1.1 Engine break-in run inspection. To determine conformance to 3.5.1, when
specified (see 6.2) at the conclusion of the break-in run the first ten engines, and every second
engine of the next ten of any contract, except overlapping contracts shall be disassembled and
inspected by the contractor in the presence of the Government inspector. Disassembly shall be
accomplished to the extent required to perform the following inspection:
a. Oil contamination.
b. Dirt chips or foreign matter in the engine block, oil pan, filters and accessory
drive case.
c. Main bearing bolt torque.
d. Connecting rod bolt torque.
e. Cylinder bore scuffing, scoring and galling.
f. Piston scuffing and burning.
g. Cylinder head torque check.
4.6.10.1.2 Corrections and reassembly. To determine conformance to 3.5.1, evidence of
any condition of engine or parts requiring correction, such correction shall be made by the
contractor prior to reassembly of the engine and resubmission to the break-in run. In addition,
the contractor shall submit objective evidence to the Government that corrective action has been
taken in production to eliminate any deficiency disclosed. Failure of the contractor to submit
such evidence shall be cause for refusal by the Government to continue acceptance of subsequent
engines. Any engine requiring replacement parts shall be reassembled and subjected to the
break-in run (see 4.6.10.1) and acceptance power check test (see 4.5.2.1). Any engine not
requiring replacement parts shall be reassembled and subjected to the acceptance power check
test only.
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