ISM, ISMe, and QSM11 – 001-036   Idler Gear, Camshaft

Before removing the idler gear, use the accessory driveshaft to rotate the crankshaft until the timing marks on the crankshaft gear (1), camshaft gear (2), and accessory drive gear (3) are completely engaged in the camshaft idler gear.

NOTE: Due to the camshaft idler gear having more gear teeth than the crankshaft gear, the camshaft idler gear timing marks will not align with the crankshaft, camshaft, and accessory drive gears timing marks on every engine revolution.

Three idler gear assemblies are used:

• Water pump idler gear (1)
• Camshaft idler gear (2)
• Hydraulic pump idler gear (3).

To remove the camshaft idler gear assembly, remove:

• The three capscrews
• Cover plate (4)
• Front thrust bearing (5)
• Idler gear (6)
• Rear thrust bearing (7)
• Idler gear shaft (8)
• Wear plate (9).

Mark or tag the individual pieces of the idler gear assembly and attach them together.