ARMY TM 9-2815-259-24
AIR FORCE TO 38G1-125-2
MARINE CORPS 09249A/09246A-24
FIGURE 4-46. ENGINE TIMING HOLE LOCATION
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 (360º) away from TDC, rotate engine slightly and repeat steps c and
(2) Set Engine with No. 4 Piston at TDC Compression Stroke.
Setting engine with No. 4 Piston at TDC Compression stroke is required in
many different maintenance steps and is not a stand alone maintenance
(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