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

When installing the camshaft idler gear (1), make certain the timing mark “0”on the crankshaft gear (2), timing mark “X” on the camshaft gear (3), and timing mark “V” on the accessory drive gear (4) are aligned as shown.

The marks on the idler gears must match the same mark on each of the other gears.

CAUTION  The grooved side of the rear thrust bearing must be facing toward the gear to prevent damage to the gear and engine during engine operation.

NOTE: Only the camshaft idler gear has a wear plate.

Use Lubriplate™ 105 or equivalent, to lubricate the wear plate, thrust bearing, and idler gear.

Install the camshaft idler gear wear plate (9).

Install the idler gear shaft (8) and rear thrust bearing (7).

CAUTION  The grooved side of the front thrust bearing must be facing toward the gear to prevent damage to the gear and engine during engine operation.

Align the timing marks and install the idler gear (6), front thrust bearing (5), and gear retainer (4).

Install the retaining capscrews and tighten.

The following idler gear end clearance and backlash checks apply to all three idler gears. The same MINIMUM and MAXIMUM values apply, also.

Use a dial indicator gauge with a magnetic base to measure the idler gear end clearance.

Place the contact tip of the gauge against the face of the idler gear.

Idler Gear End Clearance

Use a dial indicator gauge with a magnetic base to measure the idler gear backlash.

Place the contact tip of the gauge against a tooth on the idler gear.

NOTE: Do not allow the mating gears to move while measuring the backlash.

Idler Gear Backlash