Lexus LS400 (2000 year). Manual — part 102

P20674

A01901

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

A01902

A01903

EM–94

–

ENGINE MECHANICAL

CYLINDER BLOCK

1276

23.

REMOVE MAIN BEARING CAPS AND CHECK OIL
CLEARANCE

(a)

Remove the 10 main bearing cap bolts.

(b)

Uniformly loosen and remove the 20 main bearing cap
bolts in several passes, in the sequence shown.

(c)

Using 2 screwdrivers, pry out the main bearing cap, and
remove the 5 main bearing caps, 5 lower bearings and 2
lower thrust washers (No.3 main bearing cap only).

NOTICE:
Be careful not to damage the cylinder block.
HINT:

Keep the lower bearing and main bearing cap together.

Arrange the main bearing caps and lower thrust washers
in correct order.

(d)

Lift out the crankshaft.

(e)

Remove the 2 upper thrust washers.

HINT:

Arrange the upper thrust washers in correct order.

Keep the upper bearings together with the cylinder block.

(f)

Clean each main journal and bearing.

(g)

Check each main journal and bearing for pitting and
scratches.

If the journal or bearing is damaged, replace the bearings. If
necessary, replace the crankshaft.

(h)

Install the 10 main bearings and 5 main bearing caps with
the 30 bolts. Do not install the crankshaft.
(See page

EM–110

)

A01904

Z14350

Num ber
Mark

Num ber
Mark

No.1

No.2

No.3

No.4

No.5

No.1

No.2

No.3

No.4

No.5

Number
Mark

–

ENGINE MECHANICAL

CYLINDER BLOCK

EM–95

1277

(i)

Using a cylinder gauge, measure the inside diameter of
the main bearing.
Bearing inside diameter:
66.986 – 67.000 mm (2.6372 – 2.6378 in.)

(j)

Measure the diameter of the main journal.
(See page

EM–100

)

(k)

Subtract the main journal diameter measurement from
the main bearing inside diameter measurement.
Standard clearance:

No.1 and No.5

0.017 – 0.033 mm (0.0007 – 0.0013 in.)

Others

0.029 – 0.045 mm (0.0011 – 0.0018 in.)

Maximum clearance:

No.1 and No.5

0.043 mm (0.0017 in.)

Others

0.055 mm (0.0022 in.)

If the oil clearance is greater than maximum, replace the bear-
ings. If necessary, replace the crankshaft.
HINT:
If using a standard bearing, replace it with one having the same
number. If the number of the bearing cannot be determined, se-
lect the correct bearing by adding together the numbers im-
printed on the cylinder block and crankshaft, then refer to the
table below for the appropriate bearing number. There are 5
sizes of the standard bearings. For No.1 and No.5 position
bearings, use bearings marked ”3”, ”4”, ”5”, ”6” and ”7”. For oth-
ers position bearings, use bearings marked ”1”, ”2”, ”3”, ”4” and
”5”.

Cylinder block (A)

Crankshaft (B)

27 – 28

Upper

Use bearing

Lower

+

24 – 26

21 – 23

18 – 20

15 – 17

12 – 14

9 – 11

6 – 8

0 – 5

No.1, No.5:

EXAMPLE:
Cylinder block ”08” + Crankshaft ”06”
= Total number 14 (Use bearing ”4” (Upper), ”5” (Lower))

3

3

3

4

4

5

5

6

6

7

7

7

6

6

5

5

4

4

Cylinder block (A)

Crankshaft (B)

27 – 28

Upper

Use bearing

Lower

+

24 – 26

21 – 23

18 – 20

15 – 17

12 – 14

9 – 11

6 – 8

0 – 5

Others:

EXAMPLE:
Cylinder block ”08” + Crankshaft ”06”
= Total number 14 (Use bearing ”2” (Upper), ”3” (Lower))

1

1

1

2

2

3

3

4

4

5

5

5

4

4

3

3

2

2

EM–96

–

ENGINE MECHANICAL

CYLINDER BLOCK

1278

–

ENGINE MECHANICAL

CYLINDER BLOCK

EM–97

1279

Reference
Cylinder block main journal bore diameter (A):

Mark ”00”

72.000 mm (2.8346 in.)

Mark ”01”

72.001 mm (2.8347 in.)

Mark ”02”

72.002 mm (2.8347 in.)

Mark ”03”

72.003 mm (2.8348 in.)

Mark ”04”

72.004 mm (2.8348 in.)

Mark ”05”

72.005 mm (2.8348 in.)

Mark ”06”

72.006 mm (2.8349 in.)

Mark ”07”

72.007 mm (2.8349 in.)

Mark ”08”

72.008 mm (2.8350 in.)

Mark ”09”

72.009 mm (2.8350 in.)

Mark ”10”

72.010 mm (2.8350 in.)

Mark ”11”

72.011 mm (2.8351 in.)

Mark ”12”

72.012 mm (2.8351 in.)

Mark ”13”

72.013 mm (2.8352 in.)

Mark ”14”

72.014 mm (2.8352 in.)

Mark ”15”

72.015 mm (2.8352 in.)

Mark ”16”

72.016 mm (2.8353 in.)

Crankshaft main journal diameter (B):

Mark ”00”

67.000 mm (2.6378 in.)

Mark ”01”

66.999 mm (2.6378 in.)

Mark ”02”

66.998 mm (2.6377 in.)

Mark ”03”

66.997 mm (2.6377 in.)

Mark ”04”

66.996 mm (2.6376 in.)

Mark ”05”

66.995 mm (2.6376 in.)

Mark ”06”

66.994 mm (2.6376 in.)

Mark ”07”

66.993 mm (2.6375 in.)

Mark ”08”

66.992 mm (2.6375 in.)

Mark ”09”

66.991 mm (2.6374 in.)

Mark ”10”

66.990 mm (2.6374 in.)

Mark ”11”

66.989 mm (2.6374 in.)

Mark ”12”

66.988 mm (2.6373 in.)

Standard bearing center wall thickness:
No.1 and No.5

Mark ”3”

2.492 – 2.495 mm (0.0981 – 0.0982 in.)

Mark ”4”

2.495 – 2.498 mm (0.0982 – 0.0983 in.)

Mark ”5”

2.498 – 2.501 mm (0.0983 – 0.0985 in.)

Mark ”6”

2.501 – 2.504 mm (0.0985 – 0.0986 in.)

Mark ”7”

2.504 – 2.507 mm (0.0986 – 0.0987 in.)