Idler Gear Assembly - Cleaning and Inspection for Reuse (1-05) Section 1 - Cylinder Block - Group 01 M11 Page 1-26 Use a soft bristle brush to clean the oil drilling in the idler gear shaft. Use compressed air to blow out the oil drilling. Inspection Visually inspect the gear for chipped or broken teeth, and cracks. Visually inspect the shaft for damage. Use crocus cloth to remove any burrs. Measure the idler gear bushing bore inside diameter. Idler Gear Bushing Bore I. D. mm in 60.045 MIN 2.3640 60.100 MAX 2.3661