Quantcast 3-33. ROCKER ARM ASSEMBLY

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ARMY TM 9-2815-256-24 AIR FORCE TO 38G1-96-2 MARINE CORPS TM 2815-24/5 NOTE Refer to FIGURE 3-115 for engine valve locations. d. Place dial indicator tip on top of valve spring cap or rotator.  Preload indicator tip and set dial at 0.00 inch (0.00 mm). e. Remove timing pin from flywheel and manually turn engine in running direction one full revolution (360 degrees). f. Observe dial indicator reading as valve is moved to full open.  Record readings and compare with specifications given below. Intake Valves........................................................................................0.455 to 0.487 in.  (11.56 to 12.37 mm) Wear Tolerance...............................................................................................................0.438 in.  (11.13 mm) Exhaust Valves.....................................................................................0.444 to 0.477 in.  (11.28 to 12.12 mm) Wear Tolerance...............................................................................................................0.427 in.  (10.85 mm) g. Measure all remaining valves in accordance with steps d, e, and f and record readings. h. If valve lift is not within specification, remove and inspect entire valve train and camshaft. i. If  valve  lift  is  within  specification,  adjust  valves  to  specified  clearance,  as  outlined  in  paragraph  3-32.1.    and continue measuring lift on remaining valves. CAUTION Rocker arm shaft bolts must be loosened and tightened a little bit at a time to avoid warping shaft. j. Rotate engine clockwise and observe No.  6 pushrods.  When both pushrods can be rotated freely, engine is on compression stroke.  Continue to rotate engine until timing pin (JDE-81-4) can be installed in flywheel. k. Set rocker arm-to-valve tip clearance to 0.00 inch (0.00 mm) for No.  2, 4, and 6 exhaust and No.  3, 5, and 6 intake valves. I. Repeat step g. 3-33. ROCKER ARM ASSEMBLY. 3-33.1.  Removal a. Remove valve cover, refer to paragraph 3-31.1. CAUTION Capscrews (1, FIGURE 3-118) must be loosened sequentially, a little at a time, to prevent warping of shaft (7). b. Remove  six  capscrews  (1)  and  washers  (2)  securing  six  supports  (3)  to  cylinder  head;  remove  rocker  arm assembly from head. c. Remove twelve pushrods (4) and tag them as to their location.  This will aid in installation. 3-33.2. Disassembly. a. Remove plug (5, FIGURE 3-118) from one end of shaft (7).  Remove two spring washers (6). NOTE As each item is removed, tag it as to its location for use during assembly. 3-142


 


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