ARMY TM 9-2815-260-24 AIR FORCE TO 38G1-126-2 MARINE CORPS TM 09244A/09245A-24 5-103 (3) Cover all openings to prevent entry of foreign material. b.    Inspection. (1) Remove oil bypass valve assembly, refer to step a. (2) Inspect oil bypass valve (1, Figure 5-89) for damage.  Replace parts as necessary. FIGURE 5-89.  OIL BYPASS VALVE. (3) Inspect spring (2) as follows: (a) Inspect spring (2) for damage. (b) Using a ruler, check free length of spring (2).  Free length of spring should be 2.00 in. (51 mm).  Replace spring if out of specifications. (c) Using a spring tester, apply force to spring (2, Figure 5-89) until spring is compressed to a length of 1.14 in. (29 mm).  Spring tension should be 20 lbs. (87.8 N).  Replace spring if out of specifications. c.     Replacement. (1) Remove oil bypass assembly, refer to step a. (2) Inspect oil bypass assembly, refer to step b.  Replace oil bypass valve (1, Figure 5-89) or spring (2), if found defective.   (3) Install oil bypass valve assembly, refer to step d.