ADJUSTABLE IDLER GEAR REPLACEMENT - CONTINUED
Remove adjustable idler gear (3) and hub (4) from gear housing assembly (5).
Examine adjustable idler gear teeth for scoring, pitting, and wear. If damaged or worn, replace adjustable idler gear.
Inspect other gear train gears.
Inspect contact surface of hub for scoring or evidence of overheating (blue discoloration). Replace hub if it has been
overheated. Check lubrication hole and gear gallery for blockage. Slight irregularities in hub contact surface may be
removed with fine stone or emery cloth.
Inspect bushing contact surface for signs of scoring, discoloration due to overheating or excessive wear. Allowable
clearance between bushing and hub is 0.0013-0.0030 in (0.035-0.078 mm). Replace gear and bushing as an assembly, if
clearance is more than allowable or if surface of bushing is scored or has been overheated.
Install hub (4) on three studs (6) in gear housing assembly (5). Word OUT stamped on hub must be at top and facing
forward. Lubricate hub and adjustable idler gear bushing (7) with clean engine lubricating oil.
Two timing marks are on adjustable idler gear. Diamond-shaped mark must align with diamond mark on
camshaft drive gear. Other mark should be between 5 and 6 oclock to prevent damage to equipment.