TM 10-3930-669-34 D-4.  TORQUE INSTRUCTIONS. Preloading is applied with a torque wrench that is calibrated in foot pounds (lb-ft) or newton meters (N•m).  Preloading is applied before angle torques.  All angle torques listed in Table D-1 are accomplished by turning the screw/nut a specific number of degrees from a zero reference point as shown.  The tightening angle is obtained by turning the handle of the wrench  being  used  to  the  desired  angle  selected  from  a  clock  face  you  mentally  superimpose  over  the  screw  head. Torquing  of  two  or  more  screws  securing  one  assembly  should  be  accomplished  in  an  alternating  fashion  to  ensure assembly seating and equal load distribution.  For example, if angle torque specified is 30° initial then 30° final, proceed as follows: a.   Coat  screw  and  surface  under  screw  head  with engine oil, MIL-L-2104. b.   Set screws squarely to ensure assembly seating. c.   Apply specified preload with torque wrench. d.   Using  angle  torque  meter  and  socket  wrench, apply 30^ initial torque to screw 1. e.   Apply 30° initial torque to screw 2. f. Apply 30° final torque to screw 1. g.   Apply 30° final torque to screw 2. Table D-1.  Torque Specifications Preloading Angle in Degrees or Total Torque Values Application Ib-ft N•m Stage 1 Stage 2 Stage 3 Stage 4 Degree Ib-ft N•m Cylinder head 29.5 40 45° 45° 45° 30 165° - - Cylinder   head   screw plug - - - - - - - 59-66 80-90 Rocker   arm   bracket nut - - - - - - - 21 28 Rocker chamber - - - - - - - 7 10 cover screw - (+4; 2) (+5;3) D-2