Cummins ISX11.9 CM2250 – Service Manual 001-036   Idler Gear, Camshaft

Use lubricant such as Lubriplate™ 105, or equivalent, to lubricate the thrust bearings and idler gear shaft.

Install the ring dowel into the back of the idler gear shaft.

Assemble the thrust bearings and idler gear onto the idler gear shaft in the following order:

• Front thrust bearing
• Idler gear
• Rear thrust bearing.

Install the assembly onto the gear housing.

Install the four capscrews. Tighten the capscrews tight enough to hold the gear in place, but loose enough to allow for adjustment.

Insert a 0.0635 mm [0.0025 in] feeler gauge into the gear teeth mesh between the camshaft idler gear and the camshaft gear (1) as illustrated.

Insert a 0.0635 mm [0.0025 in] feeler gauge into the gear teeth mesh between the camshaft idler gear and the accessory drive (air compressor) gear (2), as illustrated.

Apply hand pressure to the camshaft idler gear shaft, such that the camshaft idler gear is pushed up tightly into the gear meshes of the other gears.

Make sure the feeler gauges are properly located between the teeth of the gears.

While holding the gear in position, tighten the two larger (M12) capscrews.

Tighten the two smaller (M10) capscrews.

Remove the shims.

A slight drag should be felt on the shims while pulling the shims out.

Check the idler gear backlash. Refer to Procedure 001-055 in Section 1.