Lexus RX300 (MCU15). Service manual — part 453

P12734

No. 1

Number Mark

No. 2

No. 3

No. 4

No. 1

No. 2 No. 3

No. 4

Number Mark

Number
Mark

No. 1 and No. 4 journal bearings

EXAMPLE:

Cylinder block ”06” (A)

= Total number 14 (Use bearing ”5”)

+ Crankshaft ”08” (B)

Cylinder block (A)

Crankshaft (B) =

+

Use Bearing

Total number

” ”: Number Mark

0 – 5

6 – 11

12 – 17 18 – 23 24 – 28

”3”

”4”

”5”

”6”

”7”

V08071

No. 1 and No. 4 journal standard bearings selection chart

Crankshaft
number mark

Cylinder block number mark

EXAMPLE:

Cylinder block ”06”, Crankshaft ”08”
= Use bearing ”5”

EM–96

–

ENGINE MECHANICAL

CYLINDER BLOCK

LEXUS RX300 (RM785E)

HINT:
If using a bearing, replace it with one having the same number.
If the number of the bearing cannot be determined, select the
correct bearing by adding together the numbers imprinted on
the cylinder block and crankshaft, then refer to the table below
for the appropriate bearing number. The No. 1 and No. 4 journal
bearings have 5 standard bearing sizes, marked ”3”, ”4”, ”5”, ”6”
and ”7” accordingly. The No. 2 and No. 3 journal bearings have
5 standard bearing sizes, marked ”1”, ”2”, ”3”, ”4” and ”5” ac-
cordingly.

No. 2 and No. 3 journal bearings

EXAMPLE:

Cylinder block ”06” (A)

= Total number 14 (Use bearing ”3”)

+ Crankshaft ”08” (B)

Cylinder block (A)

Crankshaft (B) =

+

Use Bearing

Total number

” ”: Number Mark

0 – 5

6 – 11

12 – 17 18 – 23 24 – 28

”1”

”2”

”3”

”4”

”5”

V08070

No. 2 and No. 3 journal standard bearings selection chart

Crankshaft
number mark

Cylinder block number mark

EXAMPLE:

Cylinder block ”06”, Crankshaft ”08”
= Use bearing ”3”

–

ENGINE MECHANICAL

CYLINDER BLOCK

EM–97

LEXUS RX300 (RM785E)

EM–98

–

ENGINE MECHANICAL

CYLINDER BLOCK

LEXUS RX300 (RM785E)

Reference:

Item

Mark

mm (in.)

Cylinder block main journal bore diameter

(A)

”00”

”01”

”02”

”03”

”04”

”05”

”06”

”07”

”08”

”09”

”10”

”11”

”12”

”13”

”14”

”15”

”16”

66.000 (2.5984)

66.001 (2.5985)

66.002 (2.5985)

66.003 (2.5985)

66.004 (2.5986)

66.005 (2.5986)

66.006 (2.5987)

66.007 (2.5987)

66.008 (2.5987)

66.009 (2.5988)

66.010 (2.5988)

66.011 (2.5989)

66.012 (2.5989)

66.013 (2.5989)

66.014 (2.5990)

66.015 (2.5990)

66.016 (2.5990)

Crankshaft main journal diameter (B)

”00”

”01”

”02”

”03”

”04”

”05”

”06”

”07”

”08”

”09”

”10”

”11”

”12”

61.000 (2.4016)

60.999 (2.4015)

60.998 (2.4015)

60.997 (2.4015)

60.996 (2.4014)

60.995 (2.4014)

60.994 (2.4013)

60.993 (2.4012)

60.992 (2.4012)

60.991 (2.4012)

60.990 (2.4012)

60.989 (2.4011)

60.988 (2.4011)

Standard bearing center wall thickness

”1”

”2”

”3”

”4”

”5”

”6”

”7”

2.486 – 2.489 (0.0979 – 0.0980)

2.489 – 2.492 (0.0980 – 0.0981)

2.492 – 2.495 (0.0981 – 0.0982)

2.495 – 2.498 (0.0982 – 0.0983)

2.498 – 2.501 (0.0983 – 0.0985)

2.501 – 2.504 (0.0985 – 0.0986)

2.504 – 2.507 (0.0986 – 0.0987)

(l)

Completely remove the Plastigage.

28.

REMOVE CRANKSHAFT

(a)

Lift out the crankshaft.

(b)

Remove the 4 upper main bearings and 2 upper thrust
washers from the cylinder block.

HINT:
Arrange the main bearing caps, bearings and thrust washers in
the correct order.

P12404

P12405

P12403

P12416

60

°C

P12415

–

ENGINE MECHANICAL

CYLINDER BLOCK

EM–99

LEXUS RX300 (RM785E)

29.

CHECK FIT BETWEEN PISTON AND PISTON PIN

Try to move the piston back and forth on the piston pin.
If any movement is felt, replace the piston and pin as a set.

30.

REMOVE PISTON RINGS

(a)

Using a piston ring expander, remove the 2 compression
rings.

(b)

Remove the 2 side rails and oil ring by hand.

HINT:
Arrange the piston rings in the correct order only.

31.

DISCONNECT CONNECTING ROD FROM PISTON

(a)

Using a small screwdriver, pry out the 2 snap rings.

(b)

Gradually heat the piston to approx. 60

°C (140°F).

(c)

Using a plastic–faced hammer and brass bar, lightly tap
out the piston pin and remove the connecting rod.

HINT:

S

The piston and pin are a matched set.

S

Arrange the pistons, pins, rings, connecting rods and
bearings in the correct order.