Cummins ISX11.9 CM2250 – Service Manual 001-008   Camshaft

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. Insert the pin in 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 of the block when seated correctly.

The pin is not correctly seated in the crank notch if the colored band is either completely visible outside the block, or is not visible at all.

Screw the stud adapters into the rear nose of the camshaft.

Place the camshaft guide onto the stud adapters as illustrated.

Thread the mounting capscrews through the camshaft guide and into the stud adapters

Fully insert the expanding wedge into the assembly and secure with an Allen head screw. This is to prevent the wedge from falling into the oil pan during installation of the camshaft.

Apply a liberal coating of lubricant, such as Lubriplate™ 105 or equivalent, to coat the camshaft bushings and camshaft.

CAUTION  Do not force the camshaft into the camshaft bore, as damage to the camshaft bushing can result.

NOTE: The sequence to this installation is very important. Read these instructions thoroughly before proceeding.

Start at the front of the engine. The plastic guide must be resting along the bottom of the camshaft bore.

Install the camshaft  by pushing slightly, with minor  movement of the camshaft, to carefully work the camshaft through the camshaft bushings. As each camshaft journal passes through a bushing, the camshaft will drop slightly and the camshaft lobes will catch on the bushings. Movement of  the camshaft will free the lobe from the bushing and allow the camshaft to be installed.

Stop installing the camshaft when the second camshaft journal is flush with the front gear housing.

Rotate the camshaft 180 degrees. The plastic guide should now be upward.

To prevent forward movement of the camshaft during removal of the expanding wedge, temporarily install the L-shaped clamp to the front of the gear housing as illustrated.

At the rear of the engine, remove the M6 Allen head capscrew that is securing the expanding wedge from the guide assembly.

There is a larger M8 thread, step machined into the M6 hole, for removing the wedge assembly. To remove the wedge assembly, thread a M8 capscrew into the wedge guide hole and pull out the wedge guide.

The camshaft guide will now insert into the same bore of the rear camshaft gear.

Remove the L-shaped clamp from the front of the gear housing.

CAUTION  Do not force the camshaft into the camshaft bore, as damage to the camshaft bushing can result.

NOTE: The sequence to this installation is very important. Read these instructions thoroughly before proceeding.

At the front of the engine, finish installing the camshaft by pushing slightly, with minor movement of the camshaft, to carefully work the camshaft guide through the rear camshaft gear bore and the remaining camshaft bushings.

Remove the camshaft guide tool kit.

NOTE: Be sure the camshaft is completely installed and engaged completely with the rear camshaft gear before the thrust plate is tightened. The thrust plate must not be used to drive the camshaft into place. Doing so can result in damage to the thrust plate.

Install the front camshaft gear if it has been removed. Refer to Procedure 001-012 in Section 1.

At the front of the engine, rotate the camshaft to align the holes in the camshaft gear with the thrust plate capscrew holes in the cylinder block.

Align the capscrew holes in the thrust plate with the cylinder block capscrew holes.

Install and tighten the capscrews.

Insert the timing pin, Part Number 4919342, in the hole in the camshaft timing pin boss.  Rotate the camshaft to find the slot in the camshaft and insert the timing pin.

The pin is not correctly seated in the camshaft notch if the green band is either completely visible outside the block, or is not visible at all.

Lock the camshaft in place with the camshaft locking pin, Part Number 4919342.

At the rear of the engine, remove the three 1/2 inch UNC capscrews from the flywheel housing that held the rear camshaft gear in position.

Apply pressure on the camshaft gear in a clockwise direction to take the lash out of the gear train.

Tighten the rear camshaft capscrews in a star pattern after timing the engine.

Unlock the camshaft by removing the camshaft locking pin, Part Number 4919342.

Unlock the crankshaft by removing the crankshaft locking pin, Part Number 2892115.

Measure the camshaft end clearance. Refer to Procedure 001-065 in Section 1.

Do not drop the cam follower levers on the camshaft lobes.

Carefully lower the cam followers onto the camshaft.

Use caution not to scratch or damage the rocker housing when removing the wire.

CAUTION  Failure to check the engine timing can cause severe engine damage.

Check the engine timing. Refer to Procedure 001-088 in Section 1.