TM 9-6115-604-34NAVFAC P8-633-34CHAPTER 8MAINTENANCE OF LUBRICATION SYSTEMSECTION I. FILTER AND OIL BY-PASS ASSEMBLY8-1. GENERALOil enters the filter and oil by-pass assembly under pressure. A pressure regulator valve dumps excessoil back into the oil pan. Oil enters the filter head from the oil cooler, then passes through the filter elements. A by-passvalve is provided in the filter head oil inlet cavity to ensure against interruption of oil flow if filter elements becomedogged. Oil leaving the filter elements flows to the main oil passage in the block8-2. REGULATOR VALVE DISASSEMBLY . See Figure 8-1.a.Remove oil temperature sender MT2, oil pressure alarm and shutdown switch OP1/OP2, and air control boxdisconnect switch OP3 from the lube oil filter head (24) in accordance with the Operator and OrganizationalMaintenance Manual.b.Remove capscrews (1 and 2) and lockwashers (3) to remove valve housing cover (4) and cover gasket (5).Discard the gasketc.Remove the regulator valve (items 7 through 10) as an assembly.CAUTIONSpring load will be released when roll pins are removed. Guard against loss of parts.d.Hold the valve plunger guide (7) and regulator valve plunger (9) against the spring force, and remove roll pins(6).e.Remove valve plunger guide (7), regulator valve spring (8), and regulator valve plunger (9) from regulator valvehousing (10 ).WARNINGObserve caution when removing by-pass valve cover (13). By-pass valve spring (15) maycause personal injury if spring tension is released suddenly.f.Remove capscrews (11) and lockwashers (12) to remove by-pass valve cover (13) and valve cover gasket (14).Discard the gasket.g.Remove relief plunger (16), by-pass valve spring (15), and valve housing (17).NOTETo aid in extracting piston cooling valve assembly (18), thread a 1/4 inch, 20 thread bolt,approximately 1 1/2 inch long, into the threaded recess in the pressure regulator stop (20).The pressure regulating valve assembly (18) may then be pulled from the lube oil filter head(24).h.Remove internal retaining ring (19), pressure regulator stop (20), piston cooling spring (21), and piston coolingplunger (22). Remove and discard preformed packing (23).WARNINGDry cleaning solvent, PD0680, Type Ill, or equivalent, is flammable and moderately toxic to theskin, eyes, and respiratory tract. Assure adequate ventilation. Skin, eye, and respiratoryprotection is required to avoid injury to personnel.WARNINGCompressed air used for cleaning or drying can create airborne particles that may enter theeyes. Pressure shall not exceed 30 psi (207 kPa). Wearing of goggles is required to avoidinjury to personnel.8-1
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