Lexus RX300 (MCU15). Manual - part 455

Z04011

EM6525

EM0227

EM6347

P12406

EM–104

–

ENGINE MECHANICAL

CYLINDER BLOCK

LEXUS RX300   (RM785E)

S

Check for twist

Maximum twist: 
0.15 mm (0.0059 in.) per 100 mm (3.94 in.)

If twist is greater than maximum, replace the connecting rod as-
sembly.

14.

INSPECT PISTON PIN OIL CLEARANCE

(a)

Using a caliper gauge, measure the inside diameter of the
connecting rod bushing.
Bushing inside diameter:
22.005 – 22.014 mm (0.8663 – 0.8667 in.)

(b)

Using a micrometer, measure the piston pin diameter.
Piston pin diameter:
21.997 – 22.006 mm (0.8660 – 0.8664 in.)

(c)

Subtract the piston pin diameter measurement from the
bushing inside diameter measurement.
Standard oil clearance:
0.005 – 0.011 mm (0.0002 – 0.0004 in.)
Maximum oil clearance: 0.05 mm (0.0020 in.)

If the oil clearance is greater than maximum, replace the bush-
ing. If necessary, replace the piston and piston pin as a set.
15.

INSPECT CONNECTING ROD BOLTS

Using vernier calipers, measure the tension portion diameter of
the bolt.

Standard diameter: 7.2 – 7.3 mm (0.284 – 0.287 in.)
Minimum diameter: 7.0 mm (0.276 in.)

If the diameter is less than minimum, replace the bolt.

16.

INSPECT CRANKSHAFT FOR CIRCLE RUNOUT

(a)

Place the crankshaft on V–blocks.

(b)

Using a dial indicator, measure the circle runout, as
shown in the illustration.
Maximum circle runout: 0.06 mm (0.0024 in.)

If the circle runout is greater than maximum, replace the crank-
shaft.

P12493

–

ENGINE MECHANICAL

CYLINDER BLOCK

EM–105

LEXUS RX300   (RM785E)

17.

INSPECT MAIN JOURNALS AND CRANK PINS

(a)

Using a micrometer, measure the diameter of each main
journal and crank pin.
Main journal diameter:
60.988 – 61.000 mm (2.4011 – 2.4016 in.)
Crank pin diameter:
52.992 – 53.000 mm (2.0862 – 2.0866 in.)

If the diameter is not as specified, check the oil clearance.
(See page EM–90)
If necessary, replace the crankshaft.
(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 and out–of–round is greater than maximum, replace
the crankshaft.

EM0KO–01

EM6363

SST

EM6364

Oil
Hole

EM6535

P00326

P12589

EM–106

–

ENGINE MECHANICAL

CYLINDER BLOCK

LEXUS RX300   (RM785E)

REPLACEMENT

1.

REPLACE CONNECTING ROD BUSHING

(a)

Using SST and a press, press out the bushing.
SST

09222–30010

(b)

Align the oil holes of a new bushing and the connecting
rod.

(c)

Using SST and a press, press in the bushing.
SST

09222–30010

(d)

Using a pin hole grinder, hone the bushing to obtain the
standard specified clearance (See page EM–100) be-
tween the bushing and piston pin.

(e)

Check the piston pin fit at normal room temperature. Coat
the piston pin with engine oil, and push it into the connect-
ing rod with your thumb.

2.

REPLACE CRANKSHAFT FRONT OIL SEAL
(See page LU–14)

3.

REPLACE CRANKSHAFT REAR OIL SEAL

HINT:
There are 2 methods ((a) and (b)) to replace the oil seal which
are as follows:
(a)

If the rear oil seal retainer is removed from the cylinder
block.
(1)

Using a screwdriver and hammer, tap out the oil
seal.

P12570

SST

P12808

Cut Position

P12810

SST

–

ENGINE MECHANICAL

CYLINDER BLOCK

EM–107

LEXUS RX300   (RM785E)

(2)

Using SST and a hammer, tap in a new oil seal until
its surface is flush with the rear oil seal retainer
edge.

SST

09223–15030,  09950–70010 (09951–07100)

(3)

Apply MP grease to the oil seal lip.

(b)

If the rear oil seal retainer is installed to the cylinder block.
(1)

Using a knife, cut off the oil seal lip.

(2)

Using a screwdriver, pry out the oil seal.

NOTICE:
Be careful not to damage the crankshaft. Tape the screw-
driver tip.

(3)

Apply MP grease to a new oil seal lip.

(4)

Using SST and a hammer, tap in the oil seal until its
surface is flush with the rear oil seal retainer edge.

SST

09223–15030, 09950–70010 (09951–07100)