Removal & Installation: Camshafts: Removal

1. Disconnect negative battery cable. Drain cooling system. Disconnect control cables from throttle body (if necessary). On Sienna, remove cowl top panel. See Figure. On all models, disconnect upper radiator hose at coolant outlet housing.
2. Remove air cleaner cap and airflow meter with air cleaner hose. Remove nuts and intake manifold cover located above intake manifold.
3. Disconnect necessary electrical connections and vacuum hoses from vacuum switching valve assembly located above intake manifold. Remove nuts and vacuum switching valve assembly.
   NOTE: Vacuum switching valve assembly may be referred to as emission control valve set.
4. Disconnect necessary electrical connections, coolant hoses and vacuum hoses for removal of air intake chamber located above valve cover. See Figure.
5. Remove No. 1 engine hanger and air intake chamber support. See Figure. Remove EGR pipe (if necessary).
6. Remove bolts/nuts, air intake chamber and gasket. Disconnect electrical connectors for removal of engine wiring located above valve covers. Remove bolts and engine wiring.
7. Remove bolts and ignition coil assemblies. Mark ignition coil installation location for reassembly reference. Remove spark plugs. Remove bolts, valve covers and gaskets.
8. Remove timing belt and camshaft sprockets. See TIMING BELT. Remove No. 3 timing belt cover from front of cylinder heads. See Figure. If servicing left cylinder head camshafts, remove camshaft position sensor and gasket. See Figure.
9. To service camshafts in right cylinder head, align timing marks (2 dots) on camshaft gears by rotating exhaust camshaft using hex area of camshaft. To service camshafts in left cylinder head, align timing marks (1 dot) on camshaft gears by rotating exhaust camshaft using hex area of camshaft. See Fig 1.
   Fig 1: Aligning Camshaft Timing Marks

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
10. On all applications, secure sub-gear on exhaust camshaft to main gear with a 6 x 1.0 x 18-mm service bolt "A". See Fig 2. Before removing camshaft bearing cap bolts, ensure torsional spring force of sub-gear is held by service bolt "A".
    NOTE: Camshaft bearing caps are numbered for location on top of camshaft bearing cap. Camshaft bearing cap is also stamped with either an "I" for intake camshaft or an "E" for exhaust camshaft. Arrow on top of camshaft bearing cap must point toward timing belt end of engine. See Figure. Camshaft bearing caps must be installed in correct location.
11. Note location of camshaft bearing caps, as camshaft bearing caps are numbered for location on top of camshaft bearing cap. Camshaft bearing cap is also stamped with either an "I" for intake camshaft or an "E" for exhaust camshaft. Arrow on top of camshaft bearing cap must point toward timing belt end of engine. See Fig 3.
    Fig 2: Installing Service Bolt To Secure Sub-Gear (Right Cylinder Shown; Left Cylinder Head Is Similar)

    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 3: Identifying Camshaft Bearing Caps (Right Cylinder Shown; Left Cylinder Head Is Similar)

    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    CAUTION: Camshaft bearing cap bolts must be removed in proper sequence to prevent damage to cylinder head and camshaft thrust surfaces.
12. Remove intake camshaft bearing cap bolts in sequence using several steps. See Fig 4. Remove camshaft bearing caps and intake camshaft.
13. Remove exhaust camshaft bearing cap bolts in sequence using several steps. See Fig 4. Remove camshaft bearing caps, exhaust camshaft and oil seal.
14. If disassembling exhaust camshaft, mount hexagonal area of camshaft in soft-jawed vise. Using Spanner Wrench (SST 09960-10010), rotate sub-gear counterclockwise and remove service bolt "A". See Fig 5. Remove snap ring, wave washer, sub-gear and gear spring. See Figure.

Fig 4: Camshaft Bearing Cap Bolt Removal Sequence

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Fig 5: Disassembling & Reassembling Exhaust Camshaft

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002