Camshaft and Timing Gear Train CAMSHAFT Removal 1. Remove rocker arm assembly and push rods. (See Cylinder Head, Valves and Manifolds in this section.) 2. Remove timing gear cover. (See procedure in this group.) 1 3. Check camshaft end play. (See Checks, Tests and Adjustments in this section.) 4. Check backlash of timing gears. (See Checks, Tests and Adjustments in this section.) NOTE: If a magnetic follower holder kit is not available, turn engine until oil pan is upward, to hold cam followers away from camshaft. Early 3TNA72 5. Hold cam followers away from camshaft using a magnetic follower holder kit such as D15001NU. NOTE:
Due to the odd number of teeth on the idler gear, timing marks will only align periodically. Installation Apply clean engine oil on all parts during installation. 6. Rotate crankshaft and align timing marks. IMPORTANT: DO NOT allow camshaft lobes to hit bearing surfaces while installing camshaft. Machined surfaces can be damaged. IMPORTANT: DO NOT allow camshaft lobes to hit bearing surfaces while removing camshaft. Machined surfaces can be damaged. 1. Rotate crankshaft to align timing marks. 7. Remove two cap screws and camshaft. 2. Install camshaft. 8. Inspect all parts for wear or damage. (See Inspection/Replacement procedures.) 3.
Install and tighten mounting cap screws to 11 N•m (96 lb-in.) . 4. Install timing gear cover. (See procedure in this group.) 5. Install push rods and rocker arm assembly. (See Cylinder Head, Valves and Manifolds in this section.) 1-56 4/7/95 AllTractorManuals.com Mounting Cap Screws M8 X 16 Timing Timing Marks M35501 Mounting Cap Screws M8 X 16 Timing Marks Camshaft Camshaft 3TN66, Later 3TNA72 M37832