LEXUS LS430 2003 Factory Repair Manual

Fig. 407: Exploded View Of Cylinder Block Assy Components
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OVERHAUL
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.
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. 409: Measuring Thrust Clearance Using Dial Indicator
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2.INSPECT CONNECTING ROD THRUST CLEARANCE
a. Using a dial indicator, measure the thrust clearance while moving the connecting rod back and
forth.
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190016000300570052000300130011001300140016001b0003[in.) Maximum thrust clearance:
0.35 mm (0.0138 in.)
If the thrust clearance is greater than the maximum, replace the connecting rod assembly (s).
If necessary, replace the crankshaft.
Connecting rod thickness: 22.880 to 22.920 mm (0.9008 to 0.9024 in.)
3.INSPECT CONNECTING ROD OIL CLEARANCE
a. Check that the matchmarks on the connecting rod and cap ensure correct reassembly.
b. Remove the 2 connecting rod cap bolts.

Fig. 410: Removing Connecting Rod Cap Bolts
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c. Using the 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.
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 26).
h. Remove the 2 bolts, connectin
g rod cap and lower bearing (see steps (b) and (c) above).

Fig. 411: Removing Connecting Rod Cap Bolts
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Fig. 412: Identifying Plastigage
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Fig. 413: Removing Connecting Rod Cap And Lower Bearing
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Fig. 414: Measuring Plastigage At Widest Point
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i. Measure the Plastigage at its widest point.
Standard oil clearance: 0.021 to 0.047 mm (0.0008 to 0.0019 in.) Maximum oil clearance:
0.059 mm (0.0023 in.)
If the oil clearance is greater than the maximum, replace the bearings. If necessary, replace the
crankshaft.
HINT:If using a standard bearing, replace it with one that has the same number. If the number of
the bearing cannot be determined, select the correct bearing by adding together the numbers
imprinted on the connecting rod cap and crankshaft, then select the bearing with the same number
as the total. There are 6 sizes of standard bearin
gs, marked 2, 3, 4, 5, 6 and 7.

Fig. 415: Crankshaft Bearing Number Mark Table
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