LUBRICATING SYSTEM - L.6OIL PRESSURE RELIEF VALVEThe oil pressure relief valve is contained in ahousing bolted to the bottom face of the cylinder blockand is set to operate at 50/60 lbf/in2 (3,5/4.2 kgf/cm2) -345/414 kN/m2.To Remove and Dismantle the Relief Valve Assembly1.Remove the sump securing setscrews andwithdraw the sump from the engine.2.Disconnect the oil pump delivery pipe at therelief valve end.3.Remove the one or two setscrews (according tohousing type) which secure the relief valvehousing to the cylinder block and take off therelief valve housing.4.Remove the splitpin from the end of the reliefvalve housing and withdraw the cap, spring andplunger. An exploded view of the relief valveassembly can be seen in Fig. L.11.5.Thoroughly clean all parts. Inspect them forwear or damage and renew where necessary.To Assemble and Refit the Relief Valve Assembly1.Fit the plunger, spring and cap to the relief valvehousing and secure with the split pin.Fig. L.10.Removing the Oil Relief Valve Housing from theCylinder Block.Fig. L.11.Exploded view of Oil Relief Valve.1. Relief Valve Body.2. Plunger.3. Spring.4. Spring Retaining Cap.5. Splitpin.2.If a suitable test rig is available, check thepressure setting of the relief valve. The valveshould lift between 50/60 lbf/in2 (3,5/4.2 kgf/cm2). If a test rig is not available, extremecaution is advised when starting the engine untilit has been ascertained that the pressure reliefvalve is working correctly.3.Using a new joint (where fitted) fit the relief valvehousing to the cylinder block and secure with thesetscrew(s).4.Connect the oil pump delivery pipe to the reliefvalve housing.5.Ensure that the sump strainer is correctlypositioned on the oil pump suction pipe. Usingnew joints refit the sump to the engine andsecure with the retaining setscrews. Refill thesump with clean oil of an approved grade.OIL PRESSUREAlways ensure that with the engine running, oilpressure is registering on the gauge or the oil pressurewarning light is extinguished.Pressures do vary according to climatic conditionsand even between individual engines, but the oilpressure range at maximum working speed is given onPage B.8. The pressure will drop whilst the engine isidling and also a slight drop will be experienced whenthe oil is hot, this is quite normal. If, however, the oilpressure is suspected of being too high or too low thenreference to the possible faults listed in Fault Diagnosismay prove helpful.
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