TM 10-3930-664-10 SECTION III.  Maintenance Procedures 3-4.   INTRODUCTION This section contains maintenance procedures which are the responsibility of the operator.  See paragraph 2-5, Preventive Maintenance Checks and Services for additional maintenance not covered in this section.  The maintenance procedures in this manual are authorized by the Maintenance Allocation Chart (refer to TM10-3930-664-24). 3-5.   ENGINE OIL SAMPLING VALVE - SERVICE This task covers: Obtaining an engine oil sample for the Army Oil Analysis Program (AOAP). 1. CLEAN THE ENGINE OIL SAMPLING VALVE (1). 2. START THE ENGINE, PARAGRAPH 2-9.  BRING IT TO NORMAL OPERATING TEMPERATURE. 3. OBTAIN THE OIL SAMPLE. a. With the engine at idle, remove  the  dust  cap (2) on the engine oil sampling valve (1). b. Place  a  clean  container  under  the  valve  (1) spout. c. Rotate    the    knob    (3)    clockwise    to    drain approximately one pint (.47 liters) of oil prior to taking a sample.  Release the knob (3) to close the valve. d. Place   a   sample   bottle   under   the   valve   (1) spout  and  fill  to  it  within  1/2  inch  (1.27  cm)  from  top. Release the knob (3) to close the valve.  Cap the bottle immediately. e. Install  the  dust  cap  (2)  on  the  oil  sampling valve(I).    Tighten  dustcap  only  finger  tight.    Return  the oil drained into container during step c to the engine. f. Check   oil   level   and   add   oil   if   necessary. Refer to LO10-3930-664-12. 3-14