Lexus SC300 / Lexus SC400. Manual - part 463

ASSEMBLY OF CYLINDER BLOCK

(See Components on page EM–75)

HINT:

•

Thoroughly clean all parts to be assembled.

•

Before installing the parts, apply new engine oil to all
sliding and rotating surfaces.

•

Replace all gaskets, O–rings and oil seals with new
parts.

NOTICE: Apply a generous amount of oil on the sliding
surface of the bearing, and not on the back of it or on the
surface to which it is installed.

1. 

INSTALL MAIN BEARINGS
HINT: The No. 1 main bearing is different from the rest of the
bearing.

(a)  Align the bearing claw with the claw groove of the main

bearing cap or cylinder block.

NOTICE: Install the bearing with the oil hole in the cylin-
der block.

(b) Instal the bearings in the cylinder block and main

bearing caps.

2. 

INSTALL UPPER THRUST WASHERS
Install the thrust washers under the No. 4 main journal posi-
tion of the block with the oil grooves facing outward.

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ENGINE MECHANICAL

Cylinder Block

3. 

PLACE CRANKSHAFT ON CYLINDER BLOCK

4.  INSTALL MAIN BEARING CAP AND LOWER THRUST

WASHERS

A.

 Place main bearing cap and lower thrust washers on cyl-
inder block
(a)  Install the lower thrust washers on the No. 4 main

bearing with the grooves facing outward.

(b)  Install the main bearing caps in numerical order with the

arrows facing forward.

B.

 Install main bearing cap bolts
HINT:

•

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

•

If any of the main bearing bolts break or deform, replace
them.

(a) Apply 

a 

light coat of engine oil on the threads and under

the heads of the main bearing cap bolts.

(b)  First, install and uniformly tighten the 14 main bearing

cap bolts in several passes in the sequence shown.

Torque: 44 

N

⋅

m (450 kgf

⋅

cm, 33 ft

⋅

lbf)

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

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ENGINE MECHANICAL

Cylinder Block

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(c)  Mark the front of the main bearing cap bolt head with

paint.

(d)  Second, retighten the main bearing cap bolts 90

 in the

numerical order shown above.

(e)  Check that the painted mark is now at a 90

 angle to the

front.

(f)  Check that the crankshaft turns smoothly.
(g)  Check the crankshaft thrust clearance.

(See step 5 on page EM–80)

5. 

INSTALL PISTON AND CONNECTING ROD ASSEMBLIES
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.

6. 

INSTALL CONNECTING ROD CAPS

A.  Place connecting rod cap on connecting rod

(a) Match the numbered connecting rod cap with the

connecting rod.

(b)  Install the connecting rod cap by aligning the dowel pin

to the corrosponding hole.

B.  Install connecting rod cap bolts

HINT:

•

The connecting rod cap bolts are tightened in two
progressive steps (steps (b) and (d)).

•

If any of the connecting rod bolts break or deform,
replace them.

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ENGINE MECHANICAL

Cylinder Block

(a) Apply 

a 

light coat of engine oil on the threads and under

the heads of the connecting rod cap bolts.

(b)  At first, install and alternately tighten the bolts of the

connecting rod cap in several passes.

Torque: 29 

N

⋅

m (300 kgf

⋅

cm, 22 ft

⋅

lbf)

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

(c)  Mark the front of the connecting rod cap bolt with paint.

(d)  Retighten the connecting rod cap bolts 905 in the

numerical order shown.

(e) Check 

that the painted mark is now at a 905 angle to the

front.

(f)  Check that the crankshaft turns smoothly.
(g)  Check the connecting rod thrust clearance.

(See step 2 on page EM–77)

7. 

INSTALL REAR OIL SEAL RETAINER
(a)  Remove any old packing (FIPG) material and be careful

not to drop any oil on the contact surfaces of the retainer
and cylinder block.

•

Using a razor blade and gasket scraper, remove all the
old packing (FIPG) material from the gasket surfaces
and sealing groove.

•

Thoroughly clean all components to remove all debris.

•

Using a non–residue solvent, clean both sealing
surfaces.

(b)  Apply seal packing to the retainer as shown in the

illustration.

Seal packing:   Part No. 08826–00080 or equivalent

•

Install a nozzle that has been cut to a 2–3 mm
(0.08–0.12 in.) opening.

•

Parts must be  assembled within 3 minutes of
application. Otherwise the material must be removed
and reapplied.

•

Immediately remove nozzle from the tube and reinstall
cap.

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ENGINE MECHANICAL

Cylinder Block

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