TM 9-2320-361-34 3-13. OIL PRESSURE REGULATOR HOUSING MAINTENANCE (Contd) b. Disassembly I 1. Remove oil pressure regulator valve plug (6) and gasket (5) from regulator valve housing (1) Discard gasket (5). 2. Remove oil pressure regulator spring (4) and plunger (3) from regulator valve housing (1). 3. Remove piston oil cooling control valve plug (7) and gasket (8) from regulator valve housing (1). Discard gasket (8). 4. Remove piston oil cooling control valve spring (9) and plunger (3) from regulator valve housing (1). 5. Remove plug (10) from regulator valve housing (1). c. Cleaning and Inspection 1. For general cleaning instructions, refer to para. 2-9. 2. For general inspection instructions, refer to para. 2-10. 3. Inspect bores (2) for burrs, scratches, or wear. Refer to table 3-3, Oil Pressure Regulator Wear Limits, for measurements. Remove burrs and scratches with crocus cloth. Replace if excessively burred, scratched, or worn. 4. Inspect oil pressure regulator spring (4) for distortion, cracks, and collapsed coils. Refer to table 3-3, Oil Pressure Regulator Wear Limits, for measurements. Replace oil pressure regulator spring (4) if distorted, cracked, coils are collapsed, or worn. 5. Using spring tester, compress oil pressure regulator spring (4) to 3.44 in. (87.38 mm). Load measured should be 24.6 -28.6 lb (11.17 -13.0 kg), Replace oil pressure regulator spring (4) if not within limits. 6. Inspect piston cooling relief valve spring (9) for distortion, cracks, collapsed coils, or wear. Refer to table 3-3, Oil Pressure Regulator Wear Limits, for measurements. Replace piston cooling relief valve spring (9) if distorted, cracked, coils are collapsed, or worn. 7. Using spring tester, compress piston cooling relief valve spring (9) to 1.38 in. (35.05 mm), Load measured should be 6.95-8.35 lb (3.16-3.79 kg). Replace piston cooling relief valve spring (9) if not within limits. 8. Inspect two plungers (3) for nicks, burrs, or scratches. Refer to table 3-3, Oil Pressure Regulator Wear Limits, for measurements. Replace plungers (3) if nicked, burred, scratched, or worn. Table 3-3. Oil Pressure Regulator Wear Limits. Item Item/Point of Measurement Wear Limits/Tolerance No. Inches Millimeters 2 Inside Diameter of Plunger Bores in Housing 0.803-0.804 20.40-20.42 3,10 Outside Diameter of Plunger 0.8000-0.801 2.032-20.35 4 Piston Cooling Relief Valve Spring Free Length 1.6200 41.14 9 Oil Pressure Regulator Spring Free Length 4.650 118.11 3-42