Quantcast Table 4-2.  Valve Clearance Specification (Rocker Arm-To-Valve Tip)

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ARMY TM 9-2815-259-24 AIR FORCE TO 38G1-125-2 MARINE CORPS 09249A/09246A-24 4-68 NOTE Firing order is 1-3-4-2. (2)     Set engine with No. 1 cylinder at TDC compression stroke. (3)     Check valve clearance on No. 1 and 3 exhaust valves and No. 1 and 2 intake valves per specifications in Table 4-2.  Thoroughly inspect rocker arms for damaged parts if valve clearance exceeds specifications, thoroughly inspect rocker arms for damaged parts.  If required, adjust per step 4. (4)     Loosen jam nut (8, Figure 4-48) and adjust valve clearance on No. 1 and 3 exhaust valves and No. 1 and 2 intake valves to specifications given in Table 4-2.  Torque jam nut to 20 lb-ft (27 Nm).  Verify valve clearance and adjust again if necessary. Table 4-2.  Valve Clearance Specification (Rocker Arm-To-Valve Tip) Item Specification Intake Valves 0.014 in. (0.35 mm) Exhaust Valves 0.018 in. (0.045 mm) (5)     Set engine with No. 4 cylinder at TDC compression stroke. (6)     Check valve clearance on No. 2 and 4 exhaust valves and No. 3 and 4 intake valves per specifications in Table 4-2.  If valve clearance exceeds specifications, thoroughly inspect rocker arms for damaged parts.  If required, adjust per step 7. (7)     Loosen jam nut (8, Figure 4-48) and adjust valve clearance on No. 2 and 4 exhaust valves and No. 3 and 4 intake valves to specifications given in Table 4-2.  Torque jam nut to 20 lb-ft (27 Nm).  Verify valve clearance and adjust again if necessary. (8)     Install rocker arm cover, refer to paragraph 4.7.1. c. Test Valve Lift. (1)     Remove rocker arm cover, refer to paragraph 4.7.1. (2)     Visually inspect contact surfaces of valve tips and rocker arm wear pads.  Check all parts for excessive wear.  Replace all parts that show visible damage. (3)     Set engine with No. 1 piston at TDC compression stroke, refer to step a. (4)     Loosen jam nut (8, Figure 4-48) and adjust valve clearance on No. 1 and 3 exhaust valves and No. 1 and 2 intake valves to 0.00 in. (mm).  Torque jam nut to 20 lb-ft (27 Nm). (5)     Position dial indicator tip on top of No. 1 exhaust valve spring cap. (6)     Preload dial indicator tip and set dial at 0.00 in. (mm).


 


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