MIL-PRF-46167D
4.3.3.5.1 Four-stroke cycle diesel engine - low sulfur fuel. The oil shall be tested in
accordance with ASTM D6750 (CAT 1N) test procedure using low-sulfur fuel. (Only one test is
required; however, the test limits are adjusted according to the number of tests submitted and
equivalency to original limits.) The test results shall meet the following criteria:
1 Test
2 Tests 3 Tests
Top groove filling, % avg. max.
20
23
25
WTD, demerits, avg. max.
286.2
311.7
323.0
Top land heavy carbon, % avg. max.
3
4
5
Oil consumption, grams per kilowatt hour
(g/kW-h)
0.5
0.5
0.5
Scuffing, piston/rings/liners, avg. max.
none
none
none
Stuck rings, avg. max.
none
none
none
4.3.3.5.2 Four-stroke cycle diesel engine - higher sulfur fuel. The oil shall be tested in
accordance with ASTM D6618 (CAT 1M-PC) test procedure using high-sulfur fuel. (Only one
test is required; however, when three or more tests are run, one test may be discarded and the
average determined from the remaining test results.) The test results shall meet the following
criteria:
Top groove filling, % avg. max.
70
WTD, avg. max.
240
Ring side clearance loss, millimeter max.
0.013
Piston ring sticking
none
Scuffing, piston/rings/liners
none
4.3.3.5.3 Two-stroke cycle diesel engine. The oil shall be tested in accordance with ASTM
D5862 (DDC 6V92-TA). (Only one test is required. However, if more than one test is run, the
test limits are adjusted according to the number of tests run, maximum of three tests, and
equivalency to original limits and in accordance with A5.1 thru A5.6 under ASTM D 4485.) The
test results shall meet the following criteria:
1 Test
2 Tests
3 Tests
Piston, average % area
Skirts tin removed
Report
Report
Report
Wrist pin slipper bushing copper exposed
Report
Report
Report
Average ring face distress, demerits (max.)
Fire ring, avg.
0.33
0.34
0.36
Nos. 2 and 3 compression rings, avg.
0.28
0.29
0.30
1 Test
2 Tests
3 Tests
12
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