Land Cruiser & LX470
- Remove intake manifold cover located on top of engine, above the intake manifold. Drain cooling system if any coolant hoses must be disconnected for access to valve covers. Remove air cleaner assembly with air intake hose that goes to the throttle body.
- Remove bolts/nuts and upper timing belt cover from front of each cylinder head at each camshaft. Disconnect electrical connector at each ignition coil. Remove bolts and ignition coils from valve covers.
- Remove transmission oil dipstick. Disconnect necessary hoses and engine wiring brackets for access to valve covers. Remove bolts, seal washers, valve covers and gaskets.
- Rotate crankshaft pulley clockwise (viewed from front of engine) so crankshaft pulley groove aligns with "0" mark on lower timing belt cover and cylinder No. 1 is at TDC on compression stroke. Cylinder No. 1 is front cylinder on left side of engine when viewed from flywheel end of engine. See Fig 1.
- Ensure timing marks on camshaft sprockets align with timing marks on timing belt rear plate. See Fig 2. If timing marks are not aligned, rotate crankshaft clockwise one full revolution (360 degrees) and realign crankshaft pulley groove with "0" mark on timing belt cover.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
- Using feeler gauge, measure valve clearance between valve lifter and camshaft on intake valves on cylinders No. 1, 2, 5, 7 and 8, and exhaust valves on cylinders No. 1, 4 and 8. Perform STEP 1. See Fig 1. Record valve clearance.
- Rotate crankshaft pulley clockwise one full revolution (360 degrees). Using feeler gauge, measure valve clearance between valve lifter and camshaft on intake valves on cylinders No. 3, 4 and 6, and exhaust valves on cylinders No. 2, 3, 5, 6 and 7. Perform STEP 2. See Fig 1. Record valve clearance.
- Ensure valve clearance is within specification. See VALVE CLEARANCE SPECIFICATIONS (LAND CRUISER & LX470) table.VALVE CLEARANCE SPECIFICATIONS (LAND CRUISER & LX470)
Application (1) In. (mm) Intake .006-.010 (.15-.25) Exhaust .010-.014 (.25-.35) (1) Adjust valve clearance with engine cold. - If valve clearance adjustment is required, adjusting shim between valve lifter and valve stem must be changed. To remove valve lifter, remove timing belt and camshafts. See ENGINES article.
- Remove valve lifter and adjusting shim from valve. Using micrometer, measure thickness of adjusting shim removed. Using measured clearance and adjusting shim thickness, determine correct thickness of adjusting shim to be used. See Fig 3 and Fig 4. Install adjusting shim, valve lifter, camshafts and timing belt. Recheck valve clearance.
- Before installing valve covers and gaskets, apply sealant at specified areas on cylinder head. See Fig 5.
- If spark plug tube gasket in valve cover requires replacement, bend gasket retaining tab upward. Using hammer and proper sized busing driver, drive spark plug tube gasket from valve cover. Use care not to scratch valve cover sealing surface.
- Using proper sized bushing driver, tap spark plug tube gasket into valve cover until spark plug tube gasket is even with valve cover surface. Bend retaining tab downward. Coat spark plug tube gasket sealing area with grease.
- Using NEW gasket, install valve cover, seal washers and bolts. Install and tighten valve cover bolts to specification in several steps. See TORQUE SPECIFICATIONS . To install remaining components, reverse removal procedure. Tighten bolts/nuts to specification. See TORQUE SPECIFICATIONS . Fill cooling system if drained.