Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSLEXUS1999RX 300 AWD V6-3.0L (1MZ-FE)REPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSENGINECYLINDER HEAD ASSEMBLYSYSTEM SPECIFICATIONSTIGHTENING SPECIFICATIONS
1999 Lexus RX 300 AWD V6-3.0L (1MZ-FE)
Tightening Specifications
1999 Lexus RX 300 AWD V6-3.0L (1MZ-FE)SECTION Tightening Specifications
INSTALL 12 POINTED HEAD CYLINDER HEAD BOLTS
HINT:
- The cylinder head bolts are tightened in 2 progressive steps (steps (c) and (e)).
- If any 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 cylinder head bolts on each cylinder head, in several passes, in the sequence shown, then repeat for the other side, as shown.
Torque: 54 Nm (550 kgf-cm, 40 ft. lbs.)
If any of the cylinder head bolts does not meet the torque specification, replace the cylinder head bolt.
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 the front.
INSTALL RECESSED HEAD CYLINDER HEAD BOLTS
a) Apply a light coat of engine oil on the threads and under the heads of the cylinder head bolts.
b) Using an 8 mm hexagon wrench, install the cylinder head bolt on each cylinder head, then repeat for the other side, as shown.
Torque: 18.5 Nm (185 kgf-cm, 13 ft. lbs.)
HINT:
- The cylinder head bolts are tightened in 2 progressive steps (steps (c) and (e)).
- If any 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 cylinder head bolts on each cylinder head, in several passes, in the sequence shown, then repeat for the other side, as shown.
Torque: 54 Nm (550 kgf-cm, 40 ft. lbs.)
If any of the cylinder head bolts does not meet the torque specification, replace the cylinder head bolt.
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 the front.
INSTALL RECESSED HEAD CYLINDER HEAD BOLTS
a) Apply a light coat of engine oil on the threads and under the heads of the cylinder head bolts.
b) Using an 8 mm hexagon wrench, install the cylinder head bolt on each cylinder head, then repeat for the other side, as shown.
Torque: 18.5 Nm (185 kgf-cm, 13 ft. lbs.)
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.