Lexus LS400 (2000 year). Service 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
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.
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