ARMY TM 9-2815-260-24 AIR FORCE TO 38G1-126-2 MARINE CORPS TM 09244A/09245A-24 4-66 FIGURE 4-46.  ENGINE TIMING HOLE LOCATION (f) Check rocker arms on Number 1 cylinder, refer to Figure 4-47.  If both rocker arms are loose, the engine is set with No. 1 Piston at TDC.  If both rocker arms are not loose, engine is one full revolution (360°) away from TDC, rotate engine slightly and repeat steps c and d.   (2)   Set Engine with No. 6 Piston at TDC Compression Stroke. NOTE Setting engine with No. 6 Piston at TDC Compression stroke is required in many different maintenance steps and is not a stand alone maintenance procedure. (a) Remove rocker arm cover, refer to paragraph 4.7.1. (b) Remove cover plate from timing hole (1, Figure 4-46). (c) Position timing pin (JDE81-4) in timing hole (1, Figure 4-46). (d) Position flywheel rotation tool (JDG820) in hole (2) and insure that tool meshes with flywheel gear.