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Exhaust Valves
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TM-5-4210-220-34 Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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Exhaust Valve Removal
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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