BREAKER ASSEM. 4F2283 - Caterpillar

The SAE standard engine crankshaft rotation is counterclockwise when the crankshaft is viewed from the flywheel end.
Table 1
Crankshaft Positions for Valve Lash Setting
Standard Counterclockwise Rotation
Engine Stroke for the Number 1 Piston at Top Center Position (1) Inlet Valves Exhaust Valves
G3512 Compression Stroke 1-3-6-7-10-12 1-4-5-6-9-12
Exhaust Stroke 2-4-5-8-9-11 2-3-7-8-10-11
Firing Order 1-12-9-4-5-8-11-2-3-10-7-6
(1) Put the No. 1 Piston at the top center (TC) position and identify the correct stroke. Refer to Testing and Adjusting, "Finding the Top Center Position for the No. 1 Piston". Find the top center (TC) position for a particular stroke and adjust for the correct cylinders. Remove the timing bolt. Turn the flywheel by 360 degrees in the direction of normal engine rotation. This action will put the No. 1 piston at the top center (TC) position on the other stroke. Install the timing bolt in the flywheel and complete the adjustments for the cylinders that remain.
Table 2
Crankshaft Positions for Valve Lash Setting
Optional Clockwise Rotation
Engine Stroke for the Number 1 Piston at Top Center Position (1) Inlet Valves Exhaust Valves
G3512 Compression Stroke 1-3-4-6-7-12 1-4-5-8-9-12
Exhaust Stroke 2-5-8-9-10-11 2-3-6-7-10-11
Firing Order 1-4-9-8-5-2-11-10-3-6-7-12
(1) Put the No. 1 Piston at the top center (TC) position and identify the correct stroke. Refer to Testing and Adjusting, "Finding the Top Center Position for the No. 1 Piston". Find the top center (TC) position for a particular stroke and adjust for the correct cylinders. Remove the timing bolt. Turn the flywheel by 360 degrees in the direction of normal engine rotation. This action will put the No. 1 piston at the top center (TC) position on the other stroke. Install the timing bolt in the flywheel and complete the adjustments for the cylinders that remain.