Lexus SC300 / Lexus SC400. Manual - part 642

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

–

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

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 pump body with

the mark facing upward.

(b)  Install the pump body cover with the nine screws.

Torque: 10 N

⋅

m (105 kgf

⋅

cm, 8 ft

⋅

lbf)

2. 

INSTALL RELIEF VALVE
(a)  Insert the following parts into the oil pump body hole:

(1) Relief 

valve

(2) Compression 

spring

(3) Retainer

(b)  Using snap ring pliers, install the snap ring.

LU–14

–

LUBRICATION SYSTEM

Oil Pump

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 cylinder block.

•

Using a razor blade and gasket scraper, remove all
the old packing (FIPG) material from the gasket
surfaces and sealing groove.

•

Thoroughly clean all components to remove all the
loose material.

•

Using a non–residue solvent, clean both sealing
surfaces.

NOTICE: Do not use a solvent which will affect the
painted surfaces.
(b)  Apply seal packing to the oil pump as shown in the

illustration.

Seal packing: Part No. 08826–00080 or equivalent

•

Install a nozzle that has been cut to a 2–3 mm
(0.08–0.12 in.) opening.

HINT: Avoid applying an excessive amount to the surface. Be
particularly careful near oil passages.

•

Parts must be assembled within 5 minutes of
application. Otherwise the material must be
removed and reapplied.

•

Immediately remove nozzle from the tube and
reinstall cap.

(c)  Place a new gasket in position on the cylinder block.

(d)  Engage the spline teeth of the oil pump drive rotor with

the large teeth of the crankshaft, and slide the oil pump.

–

LUBRICATION SYSTEM

Oil Pump

LU–15