2003 LEXUS LS430 Identifying ac

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25.INSTALL VALVE STEM OIL O SEAL OR RING
a. Using SST, push in a new oil seal.
SST 09201-41020
b. Apply a light coat of engine oil on a new oil seal.
Fig. 401: Identifying Oil Seal Using SST

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HINT:The intake valve oil seal is brown and the exhaust valve oil seal is gray.
Fig. 402: Identifying Intake Valve Oil Seal Is Brown And Exhaust Valve Oil Seal Is Gray

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26.INSTALL INTAKE VALVE
a. Install the valve, spring seat, compression spring and spring retainer.
b. Using SST, compress the compression spring and place the 2 keepers around the valve stem.
SST 09202-70020 (09202-00010)

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.
1.REMOVE CYLINDER BLOCK DRAIN COCK SUB-ASSY AND WATER SEAL PLATE
a. Remove the 2 nuts and seal plate.
b. Remove the RH and LH drain unions.
Fig. 408: Identifying Seal Plate

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Fig. 412: Identifying Plastigage
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Fig. 416: Identifying Crankshaft Bearing Number Mark
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EXAMPLE: Connecting rod cap "3" + Crankshaft "1" =
Total number 4 (Use bearing "4")
Reference
CONNECTING ROD BIG END INSIDE DIAMETER:
CONNECTING ROD BIG END INSIDE DIAMETER SPECIFICATIONS
CRANKSHAFT CRANK PIN DIAMETER:
CRANKSHAFT CRANK PIN DIAMETER SPECIFICATIONS
STANDARD SIZED BEARING CENTER WALL THICKNESS:
STANDARD SIZED BEARING CENTER WALL THICKNESS SPECIFICATIONS
j. Completely remove the Plastigage.
4.REMOVE PISTON AND CONNECTING ROD
a. Using a ridge reamer, remove all the carbon from the top of the cylinder.
b. Push the piston, connecting rod assembly and upper bearing through the top of the cylinder block.
HINT:
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Be sure to organize the removed piston and connecting rod assemblies in such a way that they can
be reinstalled exactly as before.
Mark 155.000 to less than 55.006 mm (2.1654 to less than 2.1656 in.)
Mark 255.006 to less than 55.012 mm (2.1656 to less than 2.1658 in.)
Mark 355.012 to less than 55.018 mm (2.1658 to less than 2.1661 in.)
Mark 455.018 to less than 55.024 mm (2.1661 to less than 2.1663 in.)
Mark 151.994 to less than 52.000 mm (2.0470 to less than 2.0472 in.)
Mark 251.988 to less than 51.994 mm (2.0468 to less than 2.0470 in.)
Mark 351.982 to less than 51.988 mm (2.0465 to less than 2.0468 in.)
Mark 21.484 to less than 1.487 mm (0.0584 to less than 0.0585 in.)
Mark 31.487 to less than 1.490 mm (0.0585 to less than 0.0587 in.)
Marl 41.490 to less than 1.493 mm (0.0587 to less than 0.0588 in.)
Mark 51.493 to less than 1.496 mm (0.0588 to less than 0.0589 in.)
Mark 61.496 to less than 1.499 mm (0.0589 to less than 0.0590 in.)
Mark 71.499 to less than 1.502 mm (0.0590 to less than 0.0591 in.)

Fig. 425: Identifying Crankshaft Bearing Cap Bolts
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b. Uniformly loosen and remove the 20 crankshaft bearing cap bolts in the sequence shown in the
illustration.
c. Using 2 screwdrivers, pry out the crankshaft bearing cap, and remove the 5 crankshaft bearing caps,
5 lower bearings and 2 lower thrust washers (No. 3 crankshaft bearing cap only).
HINT:
Keep the lower bearing and bearing cap together.

Fig. 429: Identifying Crankshaft Bearings Mark

If deep scratches are present, replace the cylinder block sub-assy.
Fig. 435: Identifying Cylinder Block Sub
-Assy
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e. Inspect the cylinder bore diameter.
HINT:
There are 3 sizes of the standard cylinder bore diameter, marked "1", "2" and "3" accordingly. The
mark is stamped on the top of the cylinder block.
If deep scratches are present, replace the c
ylinder block sub-assy.