STUD 5M3960 - Caterpillar

Introduction
Use this procedure to find the top center position for the number 1 piston.Required Tools
Table 1
Required Tools Qty
9S-9082 Engine Turning Tool 1 Check Preparation
Turn off the engine.
Illustration 1 g06183960
(1) Sensor hole
(2) Cover
(3) Timing bolt
(4) Plug
Remove cover (2) and plug (4) from the right front side of the flywheel housing. Refer to Illustration 1.
Put timing bolt (3) through the timing plug hole (4) in the flywheel housing. Use the 9S-9082 Engine Turning Tool and a 1/2 inch drive ratchet wrench to turn the flywheel in the direction of normal engine rotation. Turn the flywheel until the timing bolt engages with the hole in the flywheel.Note: Do not use the sensor hole for timing the engine.Note: If the flywheel is turned beyond the point of engagement, the flywheel must be turned in the direction that is opposite of normal engine rotation. Turn the flywheel by approximately 30 degrees. Then turn the flywheel in the direction of normal engine rotation until the timing bolt engages with the threaded hole. This procedure will remove the play from the gears when the No. 1 piston is on the top center.
Remove the valve cover for the No. 1 cylinder head.
The inlet and exhaust valves for the No. 1 cylinder are fully closed if the No. 1 piston is on the compression stroke. The rocker arms can be moved by hand when the No. 1 piston is on the compression stroke. If the rocker arms cannot be moved and the valves are slightly open, the No. 1 piston is on the exhaust stroke. Find the cylinders that can be checked or adjusted for the stroke position of the crankshaft once the timing bolt has been installed. Refer to Testing and Adjusting, "Crankshaft Position for Valve Lash Setting".Note: When the actual stroke position is identified and the other stroke position is needed, remove the timing bolt from the flywheel. Turn the flywheel by 360 degrees in the direction of normal engine rotation.