Lexus SC300 / Lexus SC400. Manual — part 533

(b) Insert the blade of SST between the No.1 and No.2 oil

pan, cut off applied sealer and remove the No.1 oil pan.

SST 09032–00100
NOTICE:

•

Be careful not to damage the No.2 oil pan contact surface

of the No.1 oil pan.

•

Be careful not to damage the oil pan flange.

10. REMOVE OIL PAN BAFFLE PLATE

Remove the six bolts, two nuts and baffle plate.

11. REMOVE NO.1 OIL PAN

(a) Remove the sixteen mounting bolts and two nuts.

(b) Remove the No.1 oil pan by prying the portions (A)

between the cylinder block and No.1 oil pan with a
screwdriver.

NOTICE: Be careful not to damage the contact surfaces
of the cylinder block and No.1 oil pan.

LU–10

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LUBRICATION SYSTEM

Oil Pump

12. REMOVE OIL STRAINER

Remove 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 bolts, stud bolt, the filter bracket and oil

filter assembly.

(c) Remove the gasket from the filter bracket.

14. REMOVE ENGINE SPEED SENSOR

(a) Disconnect the speed sensor connector.
(b) Remove the bolt and speed sensor.

15. REMOVE OIL PUMP

(a) Remove the eight mounting bolts.

(b) Remove

the oil pump by prying the portions between the

cylinder block and oil pump with a screwdriver.

NOTICE: Be careful not to damage the contact surfaces
of the cylinder block and oil pump.
(c) Remove the O–ring from the cylinder block.

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LUBRICATION SYSTEM

Oil Pump

LU–11

COMPONENTS FOR DISASSEMBLY AND
ASSEMBLY OF OIL PUMP

DISASSEMBLY OF OIL PUMP

1.

REMOVE RELIEF VALVE
Using snap ring pliers, remove the snap ring and following
parts:

(1) Retainer
(2) Compression

spring

(3) Relief

valve.

2.

REMOVE DRIVE AND DRIVEN ROTORS
Remove the nine screws, pump body cover, the drive and
driven rotors.

LU–12

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LUBRICATION SYSTEM

Oil Pump

INSPECTION OF OIL PUMP

1.

INSPECT RELIEF VALVE
Coat the valve with engine oil and check that it falls smoothly
into the valve hole by its own weight.
If it doesn’t, replace the relief valve. If necessary, replace the
oil pump assembly.

2.

INSPECT DRIVE AND DRIVEN ROTORS

A. Place drive and driven rotors into oil pump body

Face the mark of the rotors upward.

B. Inspect rotor tip clearance

Using a feeler gauge, measure the clearance between the
drive and driven rotors.

Standard tip clearance: 0.110–0.240 mm

(0.0043–0.0094 in.)

Maximum tip clearance: 0.35 mm (0.0138 in.)

If the tip clearance is greater than maximum, replace the ro-
tors as a set.

C. Inspect rotor side clearance

Using a feeler gauge and precision straight edge, measure
the clearance between the rotors and precision straight
edge.

Standard side clearance: 0.030–0.090 mm

(0.0012–0.0035 in.)

Maximum side clearance: 0.15 mm (0.0059 in.)

If the side clearance is greater than maximum, replace the ro-
tors as a set. If necessary, replace the oil pump assembly.

D. Inspect rotor body clearance

Using a feeler gauge, measure the clearance between the
driven rotor and pump body.

Standard body clearance: 0.100–0.175 mm

(0.0039–0.0069 in.)

Maximum body clearance: 0.30 mm (0.0118 in.)

If the body clearance is greater than maximum, replace the
rotors as a set. If necessary, replace the oil pump assembly.

E. Remove drive and driven rotors

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LUBRICATION SYSTEM

Oil Pump

LU–13