Lexus SC300 / Lexus SC400. Service manual - part 383

11. REMOVE 

WATER 

PUMP

(a)  Remove the 5 bolts, 2 stud bolts and nut.

(b)  Using a screwdriver remove the water pump by prying the

portions between the water pump and cylinder block.

12.  REMOVE NO.2 AND NO.1 OIL PANS

(See steps 9 to 14 on pages 

EG–501

 and 502)

13.  REMOVE OIL PUMP
(a)  Remove the 8 bolts.

(b)  Using a screwdriver, remove the oil pump by prying the

portions between the oil pump and cylinder block.

(c)  Remove the O–ring from the cylinder block.

14. REMOVE GENERATOR 

BRACKET

Remove the bolt and generator bracket.

15.  REMOVE WATER SEAL PLATE

Remove the 2 bolts and seal plate.

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ENGINE MECHANICAL

EG–155

CYLINDER BLOCK DISASSEMBLY

EG1KT–04

(See Components for Cylinder Block Disassembly and As-

sembly)

1. 

REMOVE REAR OIL SEAL RETAINER

(a)  Remove the 7 bolts.
(b)  Using a screwdriver, remove the oil sel retainer by prying the

portions between the oil seal retainer and main bearing cap.

(c)  Remove the O–ring.

2. 

CHECK CONNECTING ROD OIL CLEARANCE
Using a dial indicator, measure the thrust clearance while
moving the connecting rod back an forth.

Standard thrust clearance:

0.160 – 0.290 mm (0.0063 – 0.0138 in.)

Maximum thrust clearance:

0.35 mm (0.0138 in.)

If the thrust clearance is greater than maximum, replace the
connecting rod assembly(s). If necessary, replace the crank-
shaft.

Connecting rod thickness:

22.880 – 22.920 mm (0.9008 – 0.9024 in.)

3.  REMOVE CONNECTING ROD CAPS AND CHECK OIL

CLEARANCE

(a)  Check the matchmarks on the connecting rod and cap to

ensure correct reassembly.

(b)  Remove the 2 connecting rod cap bolts.

(c)  Using the 2 removed connecting rod cap bolts, remove the

connecting rod cap and lower bearing by wiggling the
connecting rod cap right and left.
HINT: Keep the lower bearing inserted with the connecting
rod cap.

EG–156

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ENGINE MECHANICAL

(d)  Clean the crank pin and bearing.
(e)  Check the crank pin and bearing for pitting and scratches.

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

(f) 

Lay a strip of Plastigage across the crank pin.

(g)  Install the connecting rod cap with the 2 bolts.

(See step 7 on page 

EG–183

)

Torque:

1st 25 

N

⋅

m (250 kgf

⋅

cm, 18 ft

⋅

lbf)

2nd Turn 

90

°

NOTICE: Do not turn the crankshaft.

(h)  Remove the 2 bolts, connecting rod cap and lower bearing.

(See procedure (b) and (c) above)

(i) 

Measure the Plastigage at its widest point.

Standard oil clearance:

0.027 – 0.053 mm (0.0011 – 0.0021 in.)

Maximum oil clearance:

0.065 mm (0.0026 in.)

If the oil clearance is greater than maximum, replace the
bearings. If necessary, replace the crankshaft.

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ENGINE MECHANICAL

EG–157

HINT: If using a standard bearing, replace it with one having
the same number. If the number of the bearing cannot be de-
termined, select the correct bearing by adding together the
numbers imprinted on the connecting rod cap and crank-
shaft, then selecting the bearing with the same number as the
total. There are 6 sizes of standard bearings, marked “2”, “3”,
“4”, “5”, “6” and “7” accordingly.

EXAMPLE: Connecting rod cap “3” + Crankshaft “1” = Total
number 4 (Use bearing “4”)

V01595

Reference:

Connecting rod big end inside diameter:

Mark “1”

55.000 – 55.006 mm (2.1654 – 2.1656 in.)

Mark “2”

55.006 – 55.012 mm (2.1656 – 2.1658 in.)

Mark “3”

55.012 – 55.018 mm (2.1658 – 2.1661 in.)

Mark “4”

55.018 – 55.024 mm (2.1661 – 2.1663 in.)

Crankshaft crank pin diameter:

Mark “1”

51.994 – 52.000 mm (2.0470 – 2.0472 in.)

Mark “2”

51.988 – 51.994 mm (2.0468 – 2.0470 in.)

Mark “3”

51.982 – 51.988 mm (2.0465 – 2.0468 in.)

Standard sized bearing center wall thickness:

Mark “2”

1.484 – 1.487 mm (0.0584 – 0.0585 in.)

Mark “3”

1.487 – 1.490 mm (0.0585 – 0.0587 in.)

Mark “4”

1.490 – 1.493 mm (0.0587 – 0.0588 in.)

Mark “5”

1.493 – 1.496 mm (0.0588 – 0.0589 in.)

Mark “6”

1.496 – 1.499 mm (0.0589 – 0.0590 in.)

Mark “7”

1.499 – 1.502 mm (0.0590 – 0.0591 in.)

(j) 

Completely remove the Plastigage.

EG–158

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ENGINE MECHANICAL