TM 5-4310-393-14 2. Inspecting the Inlet Valve a. Check all parts for condition and acceptable measurements.  Refer to Table 4-1 for wear limits. b. The  inlet  valve  should  be  replaced  if  It  no  longer  closes  tightly.   The  bore  diameter  of  the  valve  seat should be 4.0 mm. C Install 1. Installing the Valves.  Reassemble the 3rd stage valves and valve head using replacement parts as needed Proceed as follows: a. Reinstall the intake valve (Figure 4-11, Item 13) in the reverse sequence of its removal b. Insert the discharge valve (8) with the O-ring (7) into the valve head (10). c.    Position the valve head cover (6) Do not use a sealing compound on the third stage valve head. d.    Insert   and   torque   the   valve   head   cap   screws   (5)   to   18   Ib.-ft   (25   Nm   =   2.5   kgm)   in   a   diagonal sequence before tightening the socket set screw (4) in order to avoid damage to the valve head cover (6). e. Screw in the set screw (4) with hex key.  Fit the gasket (3) and the plain cap nut (2) and tighten with an open end wrench. f. Reinstall the tube connections to the valve head (10). Table 4-1.  Compressor Repair Data Stage Item Max. min in mm in mm Discharge valve spring length. 0.945 24 0.827 21 First Discharge valve stroke. 0.049 1.25 0.039 1 Valve seat bore diameter 0.049 1.25 Discharge valve spring length 0.945 24 0.827 21 Discharge valve stroke 0.041 1.05 0.031 0.8 Second Discharge valve seat bore 0.315 8 Inlet valve spring length 0.413 10.5 0.354 9 Inlet valve stroke 0.049 1.25 0.039 1 Inlet valve seat bore 0.492 12.5 Discharge valve seat bore 0.157 4 Third Inlet valve stroke 0.047 1.2 0.031 0.8 Discharge valve stroke 0.047 1.2 0.035 0.9 4-27