3.0L V6: Adjustments Lexus RX I

VALVE CLEARANCE ADJUSTMENT

Note. Adjust valve clearance with engine cold.

Scheme 2

1. Disconnect negative battery cable. On RX300, remove outer cowl top panel. Remove front upper suspension brace. On all models, drain cooling system. Remove right fender apron seal. Using 5-mm hexagon wrench, remove 3 cap nuts and remove "V" bank cover.
2. Disconnect necessary hoses and electrical connections from vacuum switching valves. Disconnect necessary electrical connections, coolant hoses and vacuum hoses for removal of air intake chamber. see scheme 13
3. Remove bolts, nuts, air intake chamber and gasket. see scheme 13 Disconnect electrical connectors for removal of wiring assemblies located above valve covers. Remove bolts and wiring assemblies.
4. Remove bolts and ignition coil assemblies. Mark ignition coil installation location for reassembly reference. Remove bolts, valve covers and gaskets. Disconnect upper radiator hose. Rotate crankshaft clockwise (viewed from front of engine) so cylinder No. 1 is at TDC on compression stroke. Cylinder No. 1 is front cylinder on right side when viewed from rear of engine. (Scheme 2)
5. Ensure timing mark on crankshaft pulley aligns with "0" mark on No. 1 timing belt cover. If timing marks are not aligned, rotate crankshaft clockwise one complete revolution. Ensure intake and exhaust lifters are loose on cylinder No. 1. NOTE: Valve clearances are checked with engine cold.
6. Using feeler gauge, measure and record valve clearance on intake valves of cylinders No. 1 and 6 and exhaust valves on cylinders No. 2 and 3. See STEP 1 in illustration. (Scheme 2)
7. Rotate crankshaft clockwise 2/3 turn (240 degrees). Measure and record valve clearance on intake valves of cylinders No. 2 and 3 and exhaust valves on cylinders No. 4 and 5. See STEP 2 in illustration. (Scheme 2)
8. Rotate crankshaft clockwise an additional 2/3 turn (240 degrees). Measure and record valve clearance on intake valves of cylinders No. 4 and 5 and exhaust valves on cylinders No. 1 and 6. Perform STEP 3 in illustration. (Scheme 2) Ensure valve clearance is within specification. See «VALVE CLEARANCE SPECIFICATIONS»(ref-4442-S18774153552000062700000) table. VALVE CLEARANCE SPECIFICATIONS (1) Application In. (mm) Exhaust Valve.010-.014 (.25-.35) Intake Valve.006-.010 (.15-.25) (1) Adjust valve clearance with engine cold.
9. If valve clearance requires adjustment, rotate camshaft so lobe on valve to be adjusted faces upward, away from valve lifter. Position notch on valve lifter perpendicular to camshaft. Ensure notch is not aligned with camshaft.
10. Using Valve Clearance Adjuster Set (SST 09248-55040), remove adjusting shim. Using SST "A", push downward on valve lifter. (Scheme 3)
11. Place SST "B" between camshaft and valve lifter with side marked with a "7" or "9" in right location, depending on cylinder application. (Scheme 3) Side marked with "7" should be used on front valves on cylinders No. 1 and 2. Remove SST "A".
12. Using small screwdriver and magnet, remove adjusting shim. Measure and record thickness of removed adjusting shim. Using measured clearance and adjusting shim thickness, select proper replacement adjusting shim. (Scheme 4)- (Scheme 6).
13. Install replacement adjusting shim with imprinted number on adjusting shim facing valve lifter. Recheck valve clearance. Before installing valve cover and gasket, apply sealant at front and rear areas of cylinder head. (Scheme 7)
14. Using NEW gasket, install valve cover. Install and tighten valve cover bolts to specification in several steps. See «TORQUE SPECIFICATIONS»(ref-4442-S26673951792000062700000). To install remaining components, reverse removal procedure using NEW gaskets. Tighten all fasteners to specification. Fill cooling system and adjust control cables.

Scheme 3

Scheme 4

Scheme 5

Scheme 6

Scheme 7