Camshaft and Timing Gear Train IDLER GEAR - EARLY 3TNA72 (430 LGT) Removal/Installation Idler Gear Shaft O.D.: Standard . . . . . . . . . . . . . 19.959 - 19.980 mm . . . . . . . . . . . . . . . . . . . . . . .(0.786 - 0.787 in.) 1. Remove timing gear cover. (See procedure in this group.) Wear Limit. . . . . . . . . . . 19.93 mm (0.785 in.) 2. Check backlash of timing gears. (See Checks, Tests and Adjustments in this section.) If shaft diameter is less than wear limit, replace idler gear shaft. To replace shaft: NOTE: Due to the odd number of teeth on the idler gear, timing marks will only align periodically.
When all timing marks on gears are aligned, the piston closest to the water pump is at TDC on compression stroke. Number one cylinder is closest to the flywheel. Remove set screw in end of shaft. Install a gear cover mounting cap screw with washer into threaded hole. Remove idler shaft using a slide hammer and puller. 1 Install shaft with flange toward cylinder block. Install shaft tight against block using a soft- faced hammer. Install set screw. 3. Rotate crankshaft and align timing marks. 4. Remove idler gear. 5. Inspect gear and shaft for wear or damage. (See Inspection/Replacement procedures.) Installation is done in the reverse order of removal.
M35496 Measure idler gear bushing diameter. Idler Gear M35491 Inspection/Replacement Inspect gear for chipped or broken teeth. Replace if necessary. Measure idler gear shaft diameter. Idler Gear Bushing I.D.: Standard . . . . . . . . . . . . . . 20.00 - 20.021 mm . . . . . . . . . . . . . . . . . . . . . . .(0.787 - 0.788 in.) Wear Limit. . . . . . . . . . . 20.08 mm (0.791 in.) Clearance . . . . . . . . . . . . 0.15 mm (0.0059 in.) M35494 If bushing diameter exceeds wear limit, replace bushing. 4/7/95 1-65 AllTractorManuals.com Idler Gear r Shaft r Bus M35492 hin M35492