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.
1996 Lexus LX 450FACTORY OEM SERVICE PROCEDURE
Valve Clearance
- Check and adjust valve clearance with engine cold. Drain cooling system. Remove throttle body for access to valve cover. Remove valve cover and gasket. Rotate crankshaft pulley in direction of engine rotation so crankshaft pulley groove aligns with "0" mark on timing chain cover and cylinder No. 1 (front cylinder) is at TDC on compression stroke.
- Ensure 1-dot and 2-dot timing marks on camshaft sprockets are aligned. See Fig 2. If timing marks are not aligned, rotate crankshaft pulley in direction of engine rotation one full revolution (360 degrees).
- Ensure valves on cylinder No. 1 are loose. Using feeler gauge, measure and record valve clearance of intake valves on cylinders No. 1, 2 and 4, and exhaust valves on cylinders No. 1, 3 and 5. See Fig 5.NOTE: Check and adjust valve clearance with engine cold.
Factory Service Tools
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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.