ARMY TM 9-2815-255-24
AIR FORCE TO 38G1-95-2
MARINE CORPS TM 2815-24/4
f.
Set No. 1 piston at TDC compression stroke and install timing pin (JDE81-4) in flywheel, refer to FIGURE 3-97.
FIGURE 3-95. Adjusting Valve Clearance
g.
Adjust valve clearance on No. 1 and 3 exhaust valves and No. 1 and 2 intake valves, refer to FIGURE 3-96.
h.
Turn crankshaft 360 degrees so that No. 4 piston is at TDC compression stroke and reinsert timing pin.
i.
Adjust valve clearance on No. 2 and 4 exhaust valves and No. 3 and 4 intake valves.
FIGURE 3-96. Checking Valve Clearance
3-32.2. Measure Valve Lift.
Measuring valve lift can give an indication of excess wear on cam lobes, followers, and/or pushrods.
CAUTION
For a more accurate measurement, it is recommended that valve lift be measured at 0.00 inch
(0.00 mm) rocker arm-to-valve tip clearance.
a.
Remove valve cover, refer to paragraph 3-31.1.
b.
Using center bolt on harmonic balancer, rotate crankshaft clockwise and observe No. 1 pushrods. When both
pushrods can be rotated freely engine is on compression stroke. Continue to rotate engine until timing pin
(JDE81-4) can be installed in flywheel, refer to FIGURE 3-97.
3-131
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