Lexus LS400 (2000 year). Manual — part 103

A01905

A01906

A02090

A01908

EM–98

–

ENGINE MECHANICAL

CYLINDER BLOCK

1280

Others

Mark ”1”

2.486 – 2.489 mm (0.0979 – 0.0980 in.)

Mark ”2”

2.489 – 2.492 mm (0.0980 – 0.0981 in.)

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.)

(l)

Remove the 10 bolts, 20 nuts, 5 main bearing caps and
5 lower main bearing.
(See procedure (a) to (c) above)

(m)

Remove the 5 upper main bearings from the cylinder
block.

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

24.

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.

25.

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 correct order only.

26.

DISCONNECT CONNECTING ROD FROM PISTON

(a)

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

A01909

60

°

C

A02068

–

ENGINE MECHANICAL

CYLINDER BLOCK

EM–99

1281

(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 pin and remove the connecting rod.

HINT:

The piston and pin are a matched set.

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

IG04M–02

B01300

–

IGNITION

IGNITION SYSTEM

IG–1

1458

IGNITION SYSTEM

ON–VEHICLE INSPECTION

NOTICE:
”Cold” and ”Hot” in these sentences express the tempera-
ture of the coils themselves. ”Cold” is from –10

°

C (14

°

F) to

50

°

C (122

°

F) and ”Hot” is from 50

°

C (122

°

F) to 100

°

C

(212

°

F).

1.

INSPECT IGNITION COIL WITH IGNITER AND SPARK
TEST

Check that the spark occurs.

(1)

Remove the ignition coils. (See page

IG–7

)

(2)

Using a 16 mm plug wrench, remove the spark
plugs.

(3)

Install the spark plugs to each ignition coil, and con-
nect the ignition coil connector.

(4)

Disconnect the injector connector.

(5)

Ground the spark plug.

(6)

Check if spark occurs while engine is being
cranked.

CHECK POWER SUPPLY TO IGNITION COIL

SENSOR

SPARK TEST

Replace the crankshaft position sensor.

CHECK RESISTANCE OF CAMSHAFT POSITION

(See step 4)

1. Turn ignition switch to ON.
2. Check that there is battery voltage at ignition coil positive (+)

terminal.

CHECK CONNECTION OF IGNITION COIL

Resistance:

Cold

Hot

1,060 – 1,645

Ω

CHECK RESISTANCE OF CRANKSHAFT POSITION

(See step 4)
Resistance:

Cold

Hot

1,630 – 2,740

Ω

2,065 – 3,225

Ω

CHECK IGT SIGNAL FROM ECM

(See page

DI–130

)

TRY ANOTHER IGNITION COIL

Replace the camshaft position sensor.

Connect securely.

Check wiring between ignition switch

to ignition coil.

Check wiring between ECM and ignition
coil, and then try another ECM.

NO

OK

OK

OK

OK

BAD

BAD

BAD

BAD

BAD

SENSOR

835 – 1,400

Ω

CHANGE IT TO NORMAL IGNITION COIL AND
PERFORM SPARK TEST AGAIN

OK

Replace the ignition coil with igniter.

NO

OK

CONNECTOR

IG–2

–

IGNITION

IGNITION SYSTEM

1459

NOTICE:
To prevent gasoline from being injected from injectors dur-
ing this test, crank the engine for no more than 5 – 10 se-
conds at time. If the spark done not occur, do the test as fol-
lows:

(7)

Using a 16 mm plug wrench, install the spark plugs.

Torque: 17.5 N·m (180 kgf·cm, 13 ft·lbf)
(8)

Reinstall the ignition coil. (See page

IG–8

)

2.

INSPECT SPARK PLUGS

NOTICE:

Never use a wire brush for cleaning.

Never attempt to adjust the electrode gap on used
spark plug.

Spark plug should be replaced every 144,000 km
(90,000 miles).

(a)

Remove the ignition coils. (See page

IG–7

)