1998年日产千里马Maxima原厂维修手册(英文版)-LC

ENGINE LUBRICATION&COOLING SYSTEMSSECTION LCGo to Table of ContentsGo to Quick Reference IndexSEM164FLiquid Gasket Application Procedure AEM080 e a scraper to remove all traces of old liquid gasket from mating surfaces and grooves.Also,completely clean any oil from these areas.b.Apply a continuous bead of liquid gasket to mating surfaces.(Use Genuine RTV silicone sealant Part No.999MP-A7007,Three Bond TB1207D or equivalent.)c.Apply liquid gasket around the inner side of bolt holes (unless otherwise specified).d.Assembly should be done within 5minutes after coating.e.Wait at least 30minutes before refilling engine oil and engine coolant.Special Service ToolsThe actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.Tool number(Kent-Moore No.)Tool nameDescriptionST25051001(J25695-1)Oil pressuregauge NT050ST25052000(J25695-2)Hose NT051Adapting oil pressure gauge to upper oil panWS39930000(—)Tubepressure NT052Pressing the tube of liquid gasketEG17650301(J33984-A)Radiator cap testeradapter NT053Adapting radiator cap tester to radiator filler neckKV99103510(—)Radiator plate pliersA NT224Installing radiator upper and lower tanksKV99103520(—)Radiator plate pliersB NT225Removing radiator upper and lower tanksLubrication CircuitSLC036BSLC037BSLC930AOil Pressure CheckSLC926WARNING:¼Be careful not to burn yourself,as the engine and oil may be hot.¼Oil pressure check should be done in “Neutral position”(M/T)or “Parking position”(A/T).1.Check oil level.2.Remove oil pressure switch.3.Install pressure gauge.4.Start engine and warm it up to normal operating temperature.5.Check oil pressure with engine running under no-load.Engine speedrpmApproximate discharge pressure kPa (kg/cm 2,psi)Idle speed3,000More than 69(0.70,10.0)435-551(4.44-5.62,63.1-79.9)If difference is extreme,check oil passage and oil pump for oil leaks.6.Install oil pressure switch with sealant.Oil PumpREMOVAL AND INSTALLATIONCAUTION:When removing the oil pans,oil pump assembly and timing chain from engine,first remove the camshaft position sensor (PHASE)and the crankshaft position sensor (REF)/(POS)from the assembly.Be careful not to damage sensor edge.1.Drain engine oil.2.Remove drive belts.3.Remove camshaft position sensor (PHASE),and crankshaft position sensor (REF)/(POS).4.Remove engine lower covers.5.Remove crankshaft pulley.6.Remove front exhaust tube and its support.7.Support engine at right and left side engine slingers with a suitable hoist.8.Remove engine right side mounting insulator and bracket bolts and nuts.9.Remove center member assembly.10.Remove air compressor assembly and bracket.11.Remove oil pans.(Refer to “Removal”of “OIL PAN”in EM section.)12.Remove water pump cover.13.Remove front cover assembly.14.Remove timing chain.(Refer to “Removal”of “TIMING CHAIN”in EM section.)15.Remove oil pump assembly.16.Reinstall any parts removed in reverse order of removal.DISASSEMBLY AND ASSEMBLYSLC155B ¼When installing oil pump,apply engine oil to gears.SLC932A SLC933A OIL PUMP INSPECTIONUsing a feeler gauge,straightedge and micrometers,check the following clearances:Unit:mm(in) Body to outer gear radial clearance k10.114-0.200(0.0045-0.0079)Inner gear to outer gear tip clearance k2Below0.18(0.0071)Body to inner gear axial clearance k30.030-0.070(0.0012-0.0028) Body to outer gear axial clearance k40.050-0.110(0.0020-0.0043)Inner gear to brazed portion of housing clear-ance k50.045-0.091(0.0018-0.0036)2¼If body to gear clearances(k1,k3,k4,k5)exceed the limit, replace oil pump body assembly.SLC934AASLC959A REGULATOR VALVE INSPECTION1.Visually inspect components for wear and damage.2.Check oil pressure regulator valve sliding surface and valvespring.3.Coat regulator valve with engine oil.Check that it fallssmoothly into the valve hole by its own weight.If damaged,replace regulator valve set or oil pump body.SLC935AA 4.Check regulator valve to oil pump body clearance.Clearance:k6:0.040-0.097mm(0.0016-0.0038in) If it exceeds the limit,replace oil pump body.SLC035B OIL FILTERThe oil filter is a small,full-flow cartridge type and is provided with a relief valve.Cooling CircuitSLC936ASLC937ASystem CheckSLC755A WARNING:Never remove the radiator cap when the engine is hot;serious burns could be caused by high pressure fluid escaping from the radiator.Wrap a thick cloth around the cap and carefully remove it by turning it a quarter turn to allow built-up pressure to escape and then turn the cap all the way off.CHECKING COOLING SYSTEM HOSESCheck hoses for improper attachment,leaks,cracks,damage, loose connections,chafing and deterioration.CHECKING RADIATOR CAPTo check radiator cap,apply pressure to cap with a tester.Radiator cap relief pressure:Standard78-98kPa(0.8-1.0kg/cm2,11-14psi)Limit59-98kPa(0.6-1.0kg/cm2,9-14psi)SMA967B Pull the negative pressure valve to open it. Check that it closes completely when released.SLC756A CHECKING COOLING SYSTEM FOR LEAKSTo check for leakage,apply pressure to the cooling system with a tester.Testing pressure:157kPa(1.6kg/cm2,23psi)CAUTION:Higher than the specified pressure may cause radiator dam-age.Water PumpCAUTION:¼When removing water pump assembly,be careful not to get coolant on drive belt.¼Water pump cannot be disassembled and should be replaced as a unit.¼After installing water pump,connect hose and clamp securely,then check for leaks using radiator cap tester.SLC154BSLC939A REMOVAL1.Drain coolant from drain plugs on radiator and both sides ofcylinder block.Refer to“Changing Engine Coolant”in MA section.2.Remove right side engine mounting,mounting bracket andnuts.3.Remove drive belts and idler pulley bracket.4.Remove water pump drain plug.5.Remove chain tensioner cover and water pump cover.SLC940A 6.Pushing timing chain tensioner sleeve,apply a stopper pin soit does not return.Then remove the chain tensioner assembly. Water Pump(Cont’d)SLC941A 7.Remove the3water pump fixing bolts.Secure a gap betweenwater pump gear and timing chain,by turning crankshaft pul-ley20°backwards.SLC942A 8.Put M8bolts to two M8-threaded holes out of3water pumpfixing boltholes.9.Tighten M8bolts by turning half turn alternately until they reachtiming chain rear case.¼In order to prevent damages to water pump or timing chain rear case,do not tighten one bolt continuously.Always turn each bolt half turn each time.10.Lift up water pump and remove it.¼When lifting up water pump,do not allow water pump gear to hit timing chain.SLC943A INSPECTION1.Check for badly rusted or corroded body assembly.2.Check for rough operation due to excessive end play.SLC030BA INSTALLATION1.Apply engine oil and coolant to O-rings as shown in the figure.SLC031B 2.Install water pump.¼Do not allow cylinder block to nip O-rings when installing water pump.SLC944A 3.Before installing,remove all traces of liquid gasket from mat-ing surface of water pump cover and chain tensioner cover using a scraper.Also remove traces of liquid gasket from mating surface of frontcover.4.Apply a continuous bead of liquid gasket to mating surface ofchain tensioner cover and water pump cover.SLC156B 5.Return the crankshaft pulley to its original position by turningit20°forward.SLC961A 6.Install timing chain tensioner,then remove the stopper pin.¼After installing the tensioner,race the engine at about 3,000rpm under no load to purge air from the high-pres-sure chamber.The engine may produce a rattling noise.This indicates that air still remains in the chamber and is not a matter of concern.7.Install drain plug on cylinder block.8.Reinstall any parts removed in reverse order of removal.ThermostatSLC947ACSLC962AA REMOVAL AND INSTALLATION1.Drain coolant from drain plugs on radiator and both sides ofcylinder block.2.Remove drive belts and idler pulley bracket.3.Remove water pump drain plug on pump side of cylinder block.4.Remove lower radiator hose.5.Remove water inlet and thermostat assembly.¼Do not disassemble water inlet and thermostat.Replace them as a unit,if necessary.SLC948A 6.Install thermostat with jiggle valve facing upward.¼After installation,run engine for a few minutes,and check for leaks.¼Be careful not to spill coolant over engine compartment.Use a rag to absorbcoolant.INSPECTION1.Check valve seating condition at ordinary room temperatures.It should seat tightly.2.Check valve opening temperature and maximum valve lift.StandardValve opening temperature°C(°F)82(180)Valve lift mm/°C(in/°F)More than8.6/95(0.339/203)3.Then check if valve closes at5°C(9°F)below valve openingRadiatorREMOVAL AND INSTALLATION1.Remove under cover.2.Drain coolant from radiator.3.Disconnect radiator upper and lower hoses.4.Remove radiator shroud.5.Remove A/T oil cooler hoses.(A/T models only)6.Disconnect reservoir tank hose.7.Remove radiator mounting bracket.8.Remove radiator.9.After repairing or replacing radiator,install any part removed inreverse order of removal.When filling radiator with coolant,refer to“Changing Engine Coolant”in MA section.SLC153Bk1Radiatork2Radiator filler cap k3Reservoir tankk4Radiator drain cock k5Lower radiator hosek6Oil cooler hoses(A/T models)k7Cooling fansk8Cooling fan motorsk9Radiator shroudk10Upper radiator hose Cooling Fan Control SystemCooling fans are controlled by ECM(ECCS control module).For details,refer to EC section(“Cooling Fan”,“TROUBLE DIAG-NOSIS FOR DTC P1900”).Radiator (Aluminumtype)SLC882ABSLC655CBPREPARATION1.Attach the spacer to the tip of the radiator plate pliers A.Spacer specification:1.5mm (0.059in)thick x 18mm (0.71in)wide x 8.5mm (0.335in)long.2.Make sure that when radiator plate pliers A are closed dimen-sion H ′′is approx.7.6mm (0.299in).3.Adjust dimension H ′′with the spacer,if necessary.SLC903-ADISASSEMBLY1.Remove tank withTool.¼Grip the crimped edge and bend it upwards so that Tool slips off.Do not bend excessively.SLC930¼In areas where Tool cannot be used,use a screwdriver to bend the edge up.Be careful not to damage tank.SLC9312.Make sure the edge stands straight up.3.Remove oil cooler from tank.(A/T models only)SLC894ASSEMBLY1.Install oil cooler.(A/T models only)Pay attention to direction of conical washer.SLC9322.Clean contact portion oftank.3.Install sealing rubber.Push it in with fingers.Be careful not to twist sealing rubber.SLC904-A4.Caulk tank in specified sequence with Tool.SLC896 SLC897¼Use pliers in the locations where Tool cannot be used.SLC554A 5.Make sure that the rim is completely crimped down.Standard height“H”:8.0-8.4mm(0.315-0.331in)6.Confirm that there is no leakage.Refer toInspection.INSPECTIONApply pressure with Tool.Specified pressure value:157kPa(1.6kg/cm2,23psi)WARNING:To prevent the risk of the hose coming undone while under pressure,securely fasten it down with a hose clamp.Attach a hose to the oil cooler as well.(A/T models only)Overheating Cause Analysis Symptom Check itemsCooling sys-tem parts malfunction Poor heat transferWater pump malfunction Worn or loose drive belt—Thermostat stuck closed—Damaged finsDust contamination or papercloggingMechanical damageClogged radiator cooling tubeExcess foreign material(rust,dirt,sand,etc.)Reduced air flowCooling fan does not operate.——High resistance to fan rotationDamaged fan bladesDamaged radiator shroud——Improper coolant mixture ratio———Poor coolant quality———Insufficient coolantCoolant leaksCooling hoseLoose clampCracked hoseWater pump Poor sealingRadiator capLoosePoor sealingRadiatorO-ring for damage,deteriora-tion or improper fittingCracked radiator tankCracked radiator coreReservoir tank Cracked reservoir tankOverflowing reservoir tankExhaust gas leaks into coolingsystemCylinder head deteriorationCylinder head gasket deteriora-tionExcept cool-ing system parts malfunc-tion—Overload on engineAbusive drivingHigh engine rpm under no loadDriving in low gear for extendedtimeDriving at extremely high speedPowertrain system malfunction—Installed improper size wheelsand tiresDragging brakesImproper ignition timingBlocked or restricted air flowBlocked bumper——Blocked radiator grilleInstalled car brassiereMud contamination or papercloggingBlocked radiator—Blocked condenser—Installed large fog lampEngine Lubrication System Oil pressureEngine speedrpmApproximate discharge pressure kPa(kg/cm2,psi)Idle speed More than69(0.70,10.0)3,000435-551(4.44-5.62,63.1-79.9)Regulator valveUnit:mm(in)Regulator valve to oil pump cover clearance 0.040-0.097(0.0016-0.0038)Oil pumpUnit:mm(in)Body to outer gear radial clear-ance0.114-0.200(0.0045-0.0079)Inner gear to outer gear tip clear-anceBelow0.18(0.0071)Body to inner gear axial clearance0.030-0.070(0.0012-0.0028)Body to outer gear axial clearance0.050-0.110(0.0020-0.0043)Inner gear to brazed portion ofhousing clearance0.045-0.091(0.0018-0.0036)Engine Cooling SystemThermostatValve opening temperature°C(°F)82(180)Valve lift mm/°C(in/°F)More than8.6/95(0.339/203)RadiatorUnit:kPa(kg/cm2,psi)Cap reliefpressureStandard78-98(0.8-1.0,11-14)Limit59-98(0.6-1.0,9-14)Leakage test pressure157(1.6,23)SERVICE DATA AND SPECIFICATIONS(SDS)ENGINE LUBRICATION&COOLING SYSTEMSSECTION LC CONTENTSPRECAUTIONS AND PREPARATION (2)Liquid Gasket Application Procedure (2)Special Service Tools (3)ENGINE LUBRICATION SYSTEM (4)Lubrication Circuit (4)Oil Pressure Check (5)Oil Pump (5)ENGINE COOLING SYSTEM (8)Cooling Circuit (8)System Check (9)Water Pump (9)Thermostat (14)Radiator (15)Cooling Fan Control System (15)Radiator(Aluminum type) (16)Overheating Cause Analysis (19)SERVICE DATA AND SPECIFICATIONS(SDS) (20)Engine Lubrication System (20)Engine Cooling System (20)。