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TM 5-4210-220-34
2-19.
ENGINE - Continued
(5)
Barr engine until the injector follower on No. 1L cylinder is fully depressed.
(6) Loosen the exhaust valve rocker arm push rod locknut (1).
(7)
Place a 0.016 + 0.004 in (0.41 + 0.01 mm) feeler gage (Tool J9708-01) between the valve bridge and the
valve rocker arm pallet as shown.
(8) Adjust the push rod to obtain a smooth pull on the feeler gage.
(9) Remove the feeler gage. While holding the adjusting nut with one wrench, tighten the locknut with a second
wrench.
(10) Recheck the clearance. A 0.15 in. (0.38 mm) gage will pass freely between the valve bridge , and the rocker
arm pallet. A 0.17 in. (0.43 mm) feeler gage will not pass through.
(11) Readjust push rod, if required.
(12) Adjust and check all exhaust valves in the same manner. If carried out in the following order, all valves can
be checked in one engine revolution: 1L, 3R. 3L, 2R, 2L, 1R.
(13) Replace rocker covers temporarily.
(14) Run engine to normal operating temperature and check exhaust valve clearance with a 0.013 in. (0.33 mm)
gage. This should pass freely between the valve bridge and the rocker arm whereas a 0.015 in. (0.38 mm)
gage will not. It is essential that the engine remain at or very close to normal operating temperature when
carrying out these checks.
(15) Readjust push rods as required.
(16) When complete, check the fuel injector timing as detailed in para. 2-19.5.
REMOVAL
a.
Exhaust Valve Spring Removal
NOTE
This may be removed with the cylinder head installed. For valve and spring removal with head removed,
see b. following. This procedure is for one spring; repeat for all springs on each head, as required.
(1) Remove starter motor and install barring tool J22582 (see TM 5-4210-220-12 for starter motor removal) or
barr engine using starter motor or wrench on the crankshaft pulley bolt. (If using wrench, do not rotate
engine in left-hand direction because this may loosen the bolt).
(2) Barr the engine to bring the valve and injector arms in line horizontally on the relevant cylinder.
2-205
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