MIL-DTL-62267B(AT)
for at least 30 minutes, the engine should again be operated as above before
continuing break-in run. Proper oil pressure and temperature should be maintained
during operation on level ground, 60% grades, and 30% side slopes.
c. Operation and distance. Each chassis should be given a break-in run for the
distances specified in table VI on smooth, level, hard surfaced roads. The chassis
should be operated over the undulating section of road (see figure 1) during "a"
and "b" divisions of the break-in run, the undulating section will be bypassed.
TABLE VI. Speeds and distances for break-in run.
Division
of run
Speed mph (km/h)
Distance, mile (km)
Test conditions
a
0 to 10 (0 to 16)
10 (16)
Track (road)
b
11 to 15 (17 to 24)
15 (24)
Track (road)
c
16 to 20 (25 to 32)
10 (16)
Track (road)
d
21 to max. (33 to max.)
10 (16)
Track (road)
d. Reverse operation. After each division of the break-in run, the chassis should be
stopped, engine allowed to idle for not less than 2 minutes, and then driven in
reverse for a distance of not less than 50 ft (15 m) at speeds between 2 and 7 mph
(3 and 11 km/h).
e. Condition after run. After completion of the break-in run, the engine should idle
between 700 and 750 rpm. Prior to chassis being submitted to the Government for
acceptance, all suspension wheel bearings should be checked to determine if
adjustments are correct and readjusted as required. There should be no defects
indicative of damaged components or maladjustments that may cause faulty chassis
operation.
6.7 Changes from previous issue. Marginal notations are not used in this revision to
identify changes with respect to the previous issue due to the extent of the changes.
CENTER
L IN E
6"
3'
14'
25'
C O N T O U R A P P R O X IM A T E S
A 1 2 1 F T R A D IU S
FIGURE 1. Profile of test track (artificial bump).
20
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