1991 LEXUS SC400 Service Repair Manual

Page 2129 of 4087

LEXUS SC400 1991  Service Repair Manual 
OIL PUMP
COMPONENTS FOR REMOVAL AND
INSTALLATION
LU±8±
LUBRICATION SYSTEM Oil Pump 
WhereEverybodyKnowsYourName

Page 2130 of 4087

LEXUS SC400 1991  Service Repair Manual 
REMOVAL OF OIL PUMP
(See Components on page LU±8)
HINT: When repairing the oil pump, the oil pan and strainer
should be removed and cleaned.
1.  REMOVE ENGINE WITH TRANSMISSION (See pages  EM±118 t

Page 2131 of 4087

LEXUS SC400 1991  Service Repair Manual 
(b)  Insert the blade of SST between the No.1 and No.2 oilpan,  cut off applied sealer and remove the No.1 oil pan.
SST 09032±00100
NOTICE:
w Be careful not to damage the No.2 oil pan contact surfac

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LEXUS SC400 1991  Service Repair Manual 
12.  REMOVE OIL STRAINERRemove the two bolts, two nuts, oil strainer and gasket.
13.  REMOVE OIL FILTER BRACKET (a)  Disconnect the oil pressure switch connector.
(b)  Remove the two bo lts, stud bol

Page 2133 of 4087

LEXUS SC400 1991  Service Repair Manual 
COMPONENTS FOR DISASSEMBLY AND
ASSEMBLY OF OIL PUMP
DISASSEMBLY OF OIL PUMP
1.  REMOVE RELIEF VALVEUsing snap ring pliers, remove the snap ring and following
parts:(1) Retainer
(2) Compression spring

Page 2134 of 4087

LEXUS SC400 1991  Service Repair Manual 
INSPECTION OF OIL PUMP
1.  INSPECT RELIEF VALVECoat the valve with engine oil and check that it falls smoothly
into the valve hole by its own weight.
If it doesnt, replace the relief valve. If neces

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LEXUS SC400 1991  Service Repair Manual 
REPLACEMENT OF CRANKSHAFT
FRONT OIL SEAL
(See page EM±152)
ASSEMBLY OF OIL PUMP
(See Components on page  LU±12)
1.  INSTALL DRIVE AND DRIVEN ROTORS (a) Place  the drive and driven rotors into oil p

Page 2136 of 4087

LEXUS SC400 1991  Service Repair Manual 
INSTALLATION OF OIL PUMP
(See Components on page LU±8)
1.  INSTALL OIL PUMP (a)  Remove any old packing (FIPG) material and be careful
not to drop any oil on the contact surfaces of the oil
pump cyl