Lexus LS400 (2000 year). Manual — part 77

A02230

Code Mark

No.1

No.2

Code Mark

A02091

Lower
Side
Rail

Front
Mark
(2 Cavities)

Upper
Side Rail

No.1
Compression

Expander

No.2
Compression

RH Piston

A02092

Lower
Side
Rail

Front
Mark
(1 Cavity)

Upper
Side Rail

No.1
Compression

Expander

LH Piston

No.2
Compression

EM6484

Z04019

Upper

Lower

22.5 mm

19.5 mm

No.1 and No.5

Others

–

ENGINE MECHANICAL

CYLINDER BLOCK

EM–111

1293

2.

INSTALL PISTON RINGS

(a)

Install the oil ring expander and 2 side rails by hand.

(b)

Using a piston ring expander, install the 2 compression
rings with the code mark facing upward.
Code mark:

No.1

1R

No.2

2R

(c)

Position the piston rings so that the ring ends are as
shown.

NOTICE:
Do not align the ring ends

.

3.

INSTALL BEARINGS

(a)

Align the bearing claw with the groove of the connecting
rod or connecting cap.

(b)

Install the bearings in the connecting rod and connecting
rod cap.

4.

INSTALL MAIN BEARINGS

HINT:

Main bearings come in widths of 19.5 mm (0.768 in.) and
22.5 mm (0.886 in.). Install the 22.5 mm (0.886 in.) bear-
ings in the No.1 and No.5 cylinder block journal positions
with the main bearing cap. Install the 19.5 mm (0.768 in.)
bearings in the other positions.

Upper bearings have an oil groove and oil holes; lower
bearings do not.

A02093

A02094

Mark
1, 2, 3, 4, or 5

A02095

A02107

A02096

EM–112

–

ENGINE MECHANICAL

CYLINDER BLOCK

1294

(a)

Align the bearing claw with the claw groove of the cylinder
block, and push in the 5 upper bearings.

(b)

Align the bearing claw with the claw groove of the main
bearing cap, and push in the 5 lower bearings.

HINT:
A number is marked on each main bearing cap to indicate the
installation position.

5.

INSTALL UPPER THRUST WASHERS

Install the 2 thrust washers under the No.3 journal position of
the cylinder block with the oil grooves facing outward.
6.

PLACE CRANKSHAFT ON CYLINDER BLOCK

7.

PLACE MAIN BEARING CAPS AND LOWER THRUST
WASHERS ON CYLINDER BLOCK

(a)

Install the 2 thrust washers on the No.3 bearing cap with
the grooves facing outward.

(b)

Install the 5 main bearing caps in their proper locations.

A02097

A02108

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

A02109

90

°

Front

Painted
Mark

90

°

P20674

–

ENGINE MECHANICAL

CYLINDER BLOCK

EM–113

1295

HINT:
Place the bearing caps level and let them return to their original
position by their own weight.
NOTICE:
Do not install the main bearing cap by tapping it.

8.

INSTALL MAIN BEARING CAP BOLTS

HINT:

The main bearing cap bolts are tightened in 2 progressive
steps (steps (b) and (d)).

If any one of the main bearing cap bolts is broken or de-
formed, replace it.

(a)

Apply a light coat of engine oil on the threads and under
the main bearing cap bolts.

(b)

Install and uniformly tighten the 20 main bearing cap bolts
in several passes, in the sequence shown.
Torque: 27 N·m (275 kgf·cm, 20 ft·lbf)

If any one of the main bearing cap bolts does not meet the
torque specification, replace the main bearing cap bolt.

(c)

Mark the front of the main bearing cap bolt with paint.

(d)

Retighten the main bearing cap bolts by 90

°

in the numer-

ical order shown.

(e)

Check that the painted mark is now at a 90

°

angle to the

front.

(f)

Install a new seal washer to the main bearing cap bolt.

(g)

Install and uniformly tighten the 10 main bearing cap
bolts.
Torque: 49 N·m (500 kgf·cm, 36 ft·lbf)

(h)

Check that the crankshaft turns smoothly.

9.

CHECK CRANKSHAFT THRUST CLEARANCE
(See page

EM–90

)

EM6422

A02098

A02099

A02100

Front Mark
(2 Cavities)

Front Mark
(1 Cavity)

Front

PH
Piston

LH
Piston

Front

A02110

A02111

A02112

A02113

Front

Outside Mark (Protrusion)

RH Bank

LH Bank

Outside Mark (Protrusion)

Front

EM–114

–

ENGINE MECHANICAL

CYLINDER BLOCK

1296

10.

INSTALL PISTON AND CONNECTING ROD
ASSEMBLES

Using a piston ring compressor, push the correctly numbered
piston and connecting rod assemblies into each cylinder with
the front mark of the piston facing forward.
NOTICE:
The shape of the piston varies for the RH and LH banks. The
RH piston is marked with ”R”, the LH piston with ”L”.

11.

PLACE CONNECTING ROD CAP ON CONNECTING
ROD

(a)

Match the numbered connecting rod cap with the con-
necting rod.

(b)

Align the pin groove of the connecting rod cap with the
pins of the connecting rod, and install the connecting rod
cap.

(c)

Check that the outside mark of the connecting rod cap is
facing in correct direction.