SPRING 3293965 - Caterpillar

Do not open the high pressure fuel system without allowing the fuel system to purge. After the engine has shut down, allow the fuel system to purge for ten minutes. This operating fuel system contains high pressure. Exposure to high pressure fuel can result in personal injury.
Illustration 1 g06200053
(1) Pump Cover
Remove pump cover (1) from the flywheel housing.
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(2) TDC mark on the flywheel housing
(3) 1 TC mark on the flywheel
Remove the cover on the flywheel for the Top Dead Center (TDC) mark. Rotate the flywheel counterclockwise and align TDC mark (3) with the TDC mark on the flywheel (2).
Illustration 3 g06200088
(4) Fuel supply pump gear timing mark
(5) Idle gear
(6) Idle gear timing mark
If the fuel supply pump gear timing mark (4) aligns with the idle gear timing mark (6), piston number four is at TDC. If the timing marks do not mesh, rotate the flywheel counterclockwise one revolution and recheck the timing marks.