Lexus SC300 / Lexus SC400. Manual — part 588

INSPECTION OF CRANKSHAFT

1.

INSPECT CRANKSHAFT FOR RUNOUT
(a) Place the crankshaft on V–blocks.
(b) Using a dial indicator, measure the circle runout at the

center journal.

Maximum circle runout: 0.08 mm (0.0031 in.)

If the circle runout is greater than maximum, replace the
crankshaft.

2.

INSPECT MAIN JOURNALS AND CRANK PINS
(a) Using a micrometer, measure the diameter of each main

journal and crank pin.

Main journal diameter: 66.988–67.000 mm

(2.6373–2.6378 in.)

Crank pin diameter: 51.982–52.000 mm

(2.0465–2.0472 in.)

If the diameter is not as specified, check the oil clearance
(See page

EM–136

or 139).

(b) Check each main journal and crank pin for taper and

out–of–round as shown.

Maximum taper and out–of–round: 0.02 mm

(0.0008 in.)

If the taper or out–of–round is greater than maximum, re-
place the crankshaft.

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ENGINE MECHANICAL

Cylinder Block

EM–151

REPLACEMENT OF CRANKSHAFT OIL
SEALS

HINT: There are two methods (A and B) to replace the oil seal
which are as follows:

1.

REPLACE CRANKSHAFT FRONT OIL SEAL

A.

If oil pump is removed from cylinder block:
(a) Using a screwdriver, pry out the oil seal.

(b) Using SST and a hammer, tap in a new oil seal until its

surface is flush with the oil pump body edge.

SST 09316–60010 (09316–00010)
(c) Apply MP grease to the oil seal lip.

B.

If oil pump is installed to the cylinder block:
(a) Using a knife, cut off the oil seal lip.
(b) Using a screwdriver, pry out the oil seal.
NOTICE: Be careful not to damage the crankshaft. Tape
the screwdriver tip.

(c) Apply MP grease to a new oil seal lip.
(d) Using SST and a hammer, tap in the oil seal until its

surface is flush with the oil pump body edge.

SST 09316–60010 (09316–00010)

EM–152

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ENGINE MECHANICAL

Cylinder Block

2.

REPLACE CRANKSHAFT REAR OIL SEAL

A.

If rear oil seal retainer is removed from cylinder block:
(a) Using a screwdriver and hammer, tap out the oil seal.

(b) Using SST and a hammer, tap in a new oil seal until its

surface is flush with the rear oil seal retainer edge.

SST 09223–56010
(c) Apply MP grease to the oil seal lip.

B.

If rear oil seal retainer is installed to cylinder block:
(a) Using a knife, cut off the oil seal lip.
(b) Using a screwdriver, pry out the oil seal.
NOTICE: Be careful not to damage the crankshaft.
Tape the screwdriver tip.

(c) Apply MP grease to a new oil seal lip.
(d) Using SST and a hammer, tap in the oil seal until its

surface is flush with the rear oil seal retainer edge.

SST 09223–56010

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ENGINE MECHANICAL

Cylinder Block

EM–153

ASSEMBLY OF PISTON AND
CONNECTING ROD ASSEMBLIES

1.

ASSEMBLE PISTON AND CONNECTING ROD
(a) Using

a

small screwdriver, install a new snap ring on one

side of the piston pin hole.

(b) Gradually heat the piston to about 60

°

C (140

°

F).

(c) Position the piston front mark with respect to the outside

mark on the connecting rod as shown in the diagram.

NOTICE: The installation direction of the piston and con-
necting rod are different for the RH and LH banks. The RH
piston is marked with ”R”, the LH piston with ”L”.
(d) Align the piston pin holes of the piston and connecting

rod, and push in the piston pin with your thumb.

(e) Using a small screwdriver, install a new snap ring on the

other side of the piston pin hole.

EM–154

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ENGINE MECHANICAL

Cylinder Block