Removal (Sienna)
- Remove cowl top panel assembly. See Figure. Remove right fender apron seal. Release fuel pressure. See FUEL PRESSURE RELEASE . Disconnect negative battery cable. Drain cooling system.
- Drain cooling system. Remove air cleaner cap and airflow meter with air cleaner hose. Remove front exhaust pipe. Remove right engine mount. Remove engine cover. Disconnect necessary electrical connections, ground straps, coolant hoses, fuel lines and vacuum hoses for removal of air intake chamber and cylinder head. Remove intake manifold, fuel rails and injectors.CAUTION: DO NOT allow injectors to fall from delivery pipe when removing from intake manifold.
- Remove coolant outlet. Remove generator drive belt and power steering pump. Remove ignition coils and spark plugs. Mark ignition coil installation location for reassembly reference. Remove timing belt, camshaft sprockets and No. 2 idler pulley. See TIMING BELT. Remove No. 3 timing belt cover from front of cylinder heads. See Figure.
- Remove cylinder head rear plate. See Figure. Remove coolant inlet pipe from left cylinder head and coolant inlet. Remove right exhaust manifold. Remove power steering pump bracket. Remove left exhaust manifold. Remove camshaft position sensor. Remove oil dipstick, dipstick tube and "O" ring. Remove bolts, valve covers and gaskets. Remove camshafts. See CAMSHAFTS .CAUTION: Cylinder head bolts must be loosened in proper sequence to prevent cylinder head warpage.
- Using an 8-mm hexagon wrench, remove recessed cylinder head bolts. Loosen 12-point cylinder head bolts in sequence using several steps. See Fig 2. Remove 12-point cylinder head bolts, cylinder head and cylinder head gasket.
- Note location of adjusting shims and valve lifters for reassembly reference. Components must be installed in original location. Remove adjusting shims and valve lifters (if necessary).