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 TM 55-1905-223-24-5
NOTE
Two methods for establishing valve lash clearance are described below. Either method
can be used; however, the torque wrench method has proven to be the most consistent.
It eliminates the need to feel the drag on the feeler gauge.
Torque Wrench Method: Use an inch-pound torque wrench (normally used to set preload
on top-stop injectors), and tighten the adjusting screw to 6 in-lb torque.
Feel Method: Tighten the adjusting screw until a slight drag is felt on the feeler gauge.
(a)
With the "A" valve set mark aligned with the pointer on the gear cover and both valves closed on
cylinder No. 5, loosen the locknuts on the intake and the exhaust valve adjusting screw.
(b)
If the torque wrench method is used, make adjustment as described in the NOTE above.
(c)
If the feeler gauge method is used, select a gauge for the correct valve lash specification.
Valve Lash Specification
Intake
0.028 mm
0.058 mm
(0.011 inch)
(0.023 inch)
(d)
Insert the feeler gauge between the top of the crosshead and the rocker lever pad.
(e)
Hold the adjusting screw in this position. The adjusting screw must not turn as the locknut is tightened.
Tighten the locknut to 35 ft-lbs with adapter, 45 ft-lbs without adapter.
(f)
After tightening the locknut to the correct torque value, make sure that the feeler gauge will slide
backward and forward between the crosshead and the rocker lever with only a slight drag.
(g)
If using the feel method, attempt to insert a feeler gauge that is 0.001 inch (0.03 mm) thicker between
the crosshead and the rocker lever pad. The valve lash is not correct when a thicker feeler gauge will
fit.
(h)
After adjusting the injector on cylinder No. 3 and the crossheads and valves on cylinder No. 5, rotate
the accessory drive and align the next valve set mark with the pointer.
(i)
Adjust the appropriate injector,. the crossheads, and the valves. Refer to the Injector and Valve
Adjustment Sequence Chart, Table 2-3.
2-126
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