5. Inspection and servicing of basic engine parts1315.7 Timing gearThe timing gear is helical type for minimum noise and specially treated for high durability.5.7.1 Inspecting the gears(1) Inspect the gears and replace if the teeth are damaged or worn.(2) Measure the backlash of all gears that mesh, and replace the meshing gears as a set ifwear exceeds the limit.NOTE:If backlash is excessive, it will not only result in excessive noise and gear damage, but also lead to badvalve and fuel injection timing and a decrease in engine performance.(3) Idling gearThe bushing is pressure fitted into the idling gear.Measure the bushing inner diameter and the outerdiameter of the shaft, and replace the bushing or idlinggear shaft if the oil clearance exceeds the wear limit.A, B and C are inscribed on the end of the idling gear.When assembling, these marks should align with thoseon the cylinder block.5.7.2 Gear timing marksMatch up the timing marks on each gear whenassembling (A, B and C).mmStandard LimitBacklash 0.06-0.12 0.14mmStandard LimitIdle gear shaftdiameter 44.950-44.975 44.900Idle gear bushinginside dia. 45.000-45.025 45.075Oil clearance 0.025-0.075 0.175Idle gearIdle gear bushingIdle gear shaft(Gear train)C CABBIdle gearCrankshaft gearDirection of rotationFuel injection pumpdrive gear Camshaft gearA
