Cummins ISX11.9 CM2250 – Service Manual 001-088   Engine Base Timing

NOTE: For the ISX11.9, only the rear camshaft gear is used for timing the engine. The air compressor, rear engine power take-off (REPTO) drive, and front hydraulic drive are not timed.

View shown is from left to right and top to bottom.

1. Camshaft gear
2. Fuel pump gear
3. Lubricating oil pump idler gear
4. Idler gear (compound)
5. Crankshaft gear
6. Lubricating oil pump drive gear
7. REPTO drive gear (optional)
8. REPTO idler gear (optional)

NOTE: This illustration shows the non-hydraulic drive option.

The view shown is from left to right and top to bottom.

1. Camshaft gear
2. Camshaft idler gear
3. Air compressor gear

NOTE: This illustration shows the hydraulic drive option.

View shown is from left to right and top to bottom.

1. Camshaft gear
2. Camshaft idler gear
3. Hydraulic drive idler gear
4. Air compressor gear
5. Hydraulic drive gear (view partially blocked)

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

Disconnect the batteries. Refer to the OEM service manual.

Remove the ECM to access the camshaft timing boss. Refer to Procedure 019-031 in Section 19. Remove the rubber plug from the ECM cooling plate to access the camshaft timing boss.

Rotate the crankshaft clockwise until the ”Insert Pin” mark on the outside diameter of engine vibration damper is aligned with the slot cut in  the lower left of the front gear housing. Refer to Procedure 009-035 in Section 9.

Lock the crankshaft in place with the crankshaft locking pin, Part Number 2892115, by inserting the pin into the hole in the crankshaft timing pin boss.

The colored band on the timing pin will be lined up with the surface of the timing pin boss on the cylinder block when the pin is correctly seated. The pin is not correctly seated in the crankshaft notch if the colored band is either completely visible outside the cylinder block, or is not visible at all.

Lock the camshaft in place with the camshaft locking pin, Part Number 4919342, by inserting the pin into the hole in the camshaft timing pin boss.

The colored band on the timing pin will be lined up with the surface of the timing pin boss on the cylinder block when correctly seated. The pin is not correctly seated in the camshaft notch if the colored band is either completely visible outside the cylinder block, or is not visible at all.

If the timing pins can not be correctly inserted, remove the crankshaft and camshaft locking pins and bar the engine 360 degrees. Refer to Procedure 009-035 in Section 9.

Insert the crankshaft and camshaft locking pins.

If the timing pins can not be inserted after barring the engine, the base engine timing will need to be reset.

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

• Disconnect the batteries. Refer to the OEM service manual.
• Remove the front gear cover. Refer to Procedure 001-031 in Section 1.
• Remove the ECM to access the camshaft timing boss. Refer to Procedure 019-031 in Section 19.
• Remove the rubber plug from the ECM cooling plate to access the camshaft timing boss.
• Remove the rear camshaft cover plate. Refer to Procedure 001-011 in Section 1.
• Unbolt the rear camshaft gear. Refer to Procedure 001-085 in Section 1. It is not necessary to remove the camshaft gear as long as the camshaft moves freely without moving the camshaft gear.
• Remove the rocker lever cover and gasket. Refer to Procedure 003-011 in Section 3.
• Disconnect and remove the internal actuator wiring harness. Refer to Procedure 019-063 in Section 19.
• Loosen the rocker lever adjusting screws, and remove the valve push tubes. Refer to Procedure 004-014 in Section 4.

Rotate the crankshaft clockwise until the ”Insert Pin” mark on the outside diameter of engine vibration damper is aligned with the slot cut in  the lower left of the front gear housing. Refer to Procedure 009-035 in Section 9.

Lock the crankshaft in place with the crankshaft locking pin, Part Number 2892115, by inserting the pin into the hole in the crankshaft timing pin boss.

The colored band on the timing pin will be lined up with the surface of the timing pin boss on the cylinder block when the pin is correctly seated. The pin is not correctly seated in the crankshaft notch if the colored band is either completely visible outside the cylinder block, or is not visible at all.

Use the capscrew on the front of the air compressor gear to rotate the camshaft until the timing slot in the camshaft aligns with the hole in the camshaft timing pin boss.

Lock the camshaft in place with the camshaft locking pin, Part Number 4919342, by inserting the pin into the hole in the camshaft timing pin boss.

The colored band on the timing pin will be lined up with the surface of the timing pin boss on the cylinder block when correctly seated. The pin is not correctly seated in the camshaft notch if the colored band is either completely visible outside the cylinder block, or is not visible at all.

Install the rear camshaft gear. Refer to Procedure 001-085 in Section 1.

Remove the crankshaft and camshaft timing pins.

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

• Install the rear camshaft cover plate. Refer to Procedure 001-011 in Section 1.
• Install the valve push tubes. Refer to Procedure 004-014 in Section 4.
• Adjust the overhead. Refer to Procedure 003-004 in Section 3.
• Install and connect the internal actuator wiring harness. Refer to Procedure 019-063 in Section 19.
• Install the rocker lever cover. Refer to Procedure 003-011 in Section 3.
• Install the front gear cover. Refer to Procedure 001-031 in Section 7.
• Install the ECM. Refer to Procedure 019-031 in Section 19.
• Connect the batteries. Refer to the OEM service manual.
• Operate the engine to normal operating engine temperature and check for leaks and proper operation.