CHAIN GP-BOOM 4647430 - Caterpillar

Table 1
Counterclockwise rotation (Standard) from the flywheel end of the engine
Cylinders to Check/Adjust
Engine Correct Stroke For No. 1 Piston At Top Center Position(1) Inlet Valves Exhaust Valves
C175-16 Compression 1-2-3-4-5-7-8-12 1-2-5-6-8-9-13-14
Exhaust 6-9-10-11-13-14-15-16 3-4-7-10-11-12-15-16
(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 position for a particular stroke and make the adjustment for the correct cylinders. Remove the timing bolt . Turn the flywheel by 360 degrees in the direction of normal engine rotation. This 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
Counterclockwise rotation (Standard) from the flywheel end of the engine
Cylinders to Check/Adjust
Engine Correct Stroke For No. 1 Piston At Top Center Position(1) Inlet Valves Exhaust Valves
C175-20 Compression 1-2-5-6-10-11-13-14-17-18 1-2-3-4-11-12-13-14-15-16
Exhaust 3-4-7-8-9-12-15-16-19-20 5-6-7-8-9-10-17-18-19-20
(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 position for a particular stroke and make the adjustment for the correct cylinders. Remove the timing bolt . Turn the flywheel by 360 degrees in the direction of normal engine rotation. This 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.