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Inspection - TM-5-4210-220-12_656
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Inspection (cont) - TM-5-4210-220-12_658
TM 5-4210-220-12 4-28.  ENGINE - Continued (d)  Examine the inlet valve cages for damage and wear.  Measure the valve guide diameter and the distance  from  the  top  of  the  cage  to  the  valve  stop.    Examine  the  inlet  valve  seat  for  damage. Measure from the valve seating surface to the surface that contacts. Inlet Valve Cage Valve Guide Diameter. ........................................0.920/0.916 in. (23.37/23.27 mm) Top of Cage of Valve Stop ................................... 0.137/0.131 in. (3.48 - 3.33 mm) Inlet Valve Seat Valve Seating Surface to Valve Cage Contact Surfaces  ............................................0.0265/0.0235 in. (0.673/0.597 mm) (e)  Examine the exhaust valve seat for damage and wear.  Measure the valve guide diameter and the distance from the top of the valve seat to the valve seating surface. Exhaust Valve Seat Valve Guide Diameter . ...................................... 1.151/1.145 in. (29.24-29.08 mm) Top of Valve Seat To Seating Surface.................... 0.128/0.125 in. (3.25-3.18 mm) (f)  Examine the exhaust valve stop for damage, looseness or wear.  Measure the distance from the valve end of the stop to the surface on which the spring sets.  If the exhaust valve stop is loose, worn, damaged or does not meet specifications measurement from the valve stop surface to the spring seating surface, the head assembly must be replaced. Exhaust Valve Stop Valve Stop Surface to Spring Seat Surface ............ 0.74/0.72 in. (18.80/18.30 mm) (g)  Examine the unloader seal bore diameters for scoring or pitting.  Check unloader pins for damage. Measure the length of the unloader pins. Unloader Pin Length ............................................1.854/1.850 in. (47.09/46.99 mm) (h)  Check the unloader springs for loads at specified heights. Unloader Spring Load at 0.395 .......................................4.18/3.38 lb (1.90/1.53 kg) (8)  Inspect pistons, connecting rods and bearings as detailed below. (a)  Examine pistons for scoring, cracks or other damage.  Replace as needed. (b)  Measure the outside diameter of the piston at a 90 deg. angle to the piston pin bore.  Compare this measurement with the diameter of the cylinder bore.  Piston to bore clearance should not exceed 0.008 in. (0.20 mm) replace the pistons.  The block must be replaced or bored oversize to 0.020 in. (0.51 mm).  Oversize pistons at 0.020 in. (0.51 mm) are available for the EL 1600 air compressor. Piston Diameter Below ................................ 2.7450/2.7440 in. (69.723/69.698 mm) 4-543

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