SERVICE MANUALLUBRICATING OIL PUMP, OIL FILTERS & COOLERSection 8Inspect Oil Pressure Regulator Valve as follows:1.Remove valve retaining plug from crank- case.2.Remove oil pressure regulating valve fromcrankcase bore.3.Move the regulator inner valve assembly (1, Fig.13) to ensure it operates freely.4.Inspect per Figures 13a and 13b.5.Make sure that the snap rings (4 and 5, Fig. 13)are in position and the inner valve spool has anunobstructed 3.175 mm (0.125 in.) diameter bleedhole (3, Fig. 13).NOTE: This inspection can be performed without oilpressure regulator valve disassembly.Figure 13. - Oil Pressure Regulator Valve1.Inner Valve Assembly2.Outer Valve Assembly3.3.175 mm (.125 in.) Bleed Hole4.Snap Ring5.Large Snap RingFigure 13a. - Lube Oil Pressure Regulating Valve CheckPointsFigure 13b. - Cross-Sectional View of PressureRegulating Valve Complete Assembly Check PointsNOTE: If conditions exist as shown in Figures 13aand 13b and dimensions are not as specified replacecomplete valve assembly.Inspect and Repair Oil Drain Hole as follows:1.Locate oil drain hole in the crankcase pressureregulator valve bore (Fig. 14).NOTE: The oil drain hole is an elliptical shaped port,positioned in the lower radius of the bore. Threeo’clock to six o’clock on 400 Series engines and sixo’clock to nine o’clock on 300 Series engines.Obstruction of the drain hole will result in excessiveoil pressure and possible oil filter rupture.Figure 14. - Pressure Regulator Valve Bore (AEApplication Shown)1.Oil Pressure Regulator Valve Bore2.Elliptical Drain Hole - approximately12.7 mm (0.5 in.) X 6.3 mm (0.25 in.)3.Oil Filter BaseCGES-185-3PRINTED IN UNITED STATES OF AMERICAPage 10
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