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Home >> Lexus >> 1999 >> LS 400 V8-4.0L (1UZ-FE) >> Repair and Diagnosis >> Specifications >> Mechanical Specifications >> Engine >> Cylinder Head Assembly >> System Specifications >> Tightening Specifications
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Tightening Specifications

INSTALL CYLINDER HEAD BOLTS

HINT: The cylinder head bolts are tightened in 2 progressive steps (steps (c) and e))

If any cylinder head bolt is broken or deformed, replace it.
a. Apply a light coat of engine oil on the threads and under the heads of the cylinder head bolts.
b. Install the plate washer to the cylinder head bolt.





c. Install and uniformly tighten the 10 cylinder head bolts on one side of the cylinder head in several passes in the sequence shown, then do the other side as shown.
Torque: 39 Nm (400 kgf.cm, 29 ft. lbs.)
If any one of the cylinder head bolts does not meet the torque specification, replace the cylinder head bolt.





NOTICE: Do not drop the plate washer for cylinder head bolt into position A of the cylinder head. If dropped into portion A, the plate washer will pass through the cylinder head and cylinder block into the oil pan.





d. Mark the front of the cylinder head bolt head with paint.
e. Retighten the cylinder head bolts by 90° in the numerical order shown.
f. Check that the painted mark is now at a 90° angle to front.
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