Engine Mechanical - 1MZ-FE: Adjustments — Engine Mechanical - 1MZ-FE — Mechanical

Engine Mechanical - 1MZ-FE: Adjustments Toyota Highlander I

Mechanical 5 illustrations ~509 words

VALVE CLEARANCE ADJUSTMENT

WARNING

To prevent air bag deployment, disconnect negative battery cable at least 90 seconds before working on vehicle.

Disconnect negative battery cable. Drain cooling system. Remove right fender apron seal.
Remove "V" bank cover (2 nuts and 2 clips). Remove air intake chamber assembly. Remove ignition coils. Disconnect upper radiator hose at coolant outlet housing. Remove front suspension brace sub-assembly upper center. Remove air cleaner assembly with hose. Remove intake air surge tank. Remove cylinder head covers.
Rotate crankshaft timing sprocket clockwise (viewed from front of engine) so pulley groove is aligned with "0" timing mark of lower timing belt cover. This sets cylinder No. 1 to TDC on compression stroke. Cylinder No. 1 is front cylinder on right side when viewed from rear of engine. (Scheme 12)
Ensure intake and exhaust valve lifters on cylinder No. 1 are loose. If conditions are not as described, rotate crankshaft clockwise one complete revolution.
Using feeler gauge, measure and record valve clearance between valve lifter and camshaft on intake valves of cylinders No. 1 and 6 and exhaust valves on cylinders No. 2 and 3. (Scheme 12)
Rotate crankshaft clockwise an additional 2/3 turn (240 degrees). Measure and record valve clearance between valve lifter and camshaft on intake valves of cylinders No. 2 and 3 and exhaust valves on cylinders No. 4 and 5. (Scheme 12)
Rotate crankshaft clockwise an additional 2/3 turn (240 degrees). Measure and record valve clearance between valve lifter and camshaft on intake valves of cylinders No. 4 and 5 and exhaust valves on cylinders No. 1 and 6. (Scheme 12)
To determine if valve clearances are within specification, see VALVE CLEARANCE SPECIFICATIONS table. VALVE CLEARANCE SPECIFICATIONS Application (1) In. (mm) Exhaust Valve.010-.014 (.25-.35) Intake Valve.006-.010 (.15-.25) (1) Adjust valve clearance with engine cold.
If valve clearance requires adjustment, rotate camshaft so lobe on valve to be adjusted is facing upward, away from valve lifter. Position notch on valve lifter perpendicular to the camshaft. Ensure notch is not aligned with the camshaft. Valve Clearance Adjuster (SST 09248-55040) is used to remove adjusting shim. Using SST "A" of valve clearance adjuster, push downward on valve lifter. (Scheme 13)
Place SST "B" between camshaft and valve lifter with the side marked with a "7" or "9" in the right location, depending on cylinder application. Side marked with "7" should be used on front valves on No. 1 and 2 cylinders only. Remove SST "A".
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 14)and (Scheme 15).
Install replacement adjusting shim with imprinted number on adjusting shim facing the valve lifter. Recheck valve clearance. Before installing valve cover and gasket, apply sealant at front and rear areas of cylinder head. (Scheme 16)
Using NEW gasket, install valve cover. Install and tighten valve cover bolts to specification in several steps. See TORQUE SPECIFICATIONS. To install remaining components, reverse removal procedure. Use NEW gaskets. Tighten all fasteners to specification. Fill cooling system.