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Removal & Installation: Camshafts: Installation

  1. When assembling exhaust camshaft, install gear spring, sub-gear, wave washer and snap ring. Using spanner wrench, rotate sub-gear counterclockwise until holes in main gear and sub-gear are aligned. Ensure pins on the gears align with ends of gear spring. Install service bolt "A". See Figure.
  2. Apply grease to thrust surfaces and journals of camshafts. Install exhaust camshaft in cylinder head. Rotate exhaust camshaft so timing marks (2 dots) on right cylinder head or 1 dot on left cylinder head are positioned at 90-degree angle to cylinder head. See Fig 1.
    Fig 1: Positioning Exhaust Camshafts
    G94F46339Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Apply grease to seal lip on NEW oil seal. Install oil seal on exhaust camshaft. Apply sealant on No. 1 exhaust camshaft bearing cap at bearing cap-to-cylinder head surface.
  4. Install exhaust camshaft bearing caps in numerical order. Ensure arrow on top of camshaft bearing cap is pointing toward timing belt end of engine. See Figure.
  5. Coat camshaft bearing cap bolt-to-camshaft bearing cap surface and bolt threads with engine oil. Install and tighten exhaust camshaft bearing cap bolts to specification in sequence using several steps. See Fig 2. See TORQUE SPECIFICATIONS .
  6. Install intake camshaft in cylinder head. Rotate intake camshaft so timing marks (2 dots) on right cylinder head or 1 dot on left cylinder head are aligned with timing mark on exhaust camshaft. See Figure.
  7. Install intake camshaft bearing caps in numerical order. Ensure arrow on top of camshaft bearing cap is pointing toward timing belt end of engine. See Figure.
  8. Coat camshaft bearing cap bolt-to-camshaft bearing cap surface and bolt threads with engine oil. Install and tighten intake camshaft bearing cap bolts to specification in sequence using several steps. See Fig 2. See TORQUE SPECIFICATIONS .
    CAUTION: Ensure service bolt "A" is removed from sub-gear on exhaust camshafts.
  9. On all cylinder head applications, remove service bolt "A" from exhaust camshaft. Check and adjust valve clearance. See VALVE CLEARANCE ADJUSTMENT  under ADJUSTMENTS.
  10. Apply sealant to grooves of semi-circular plugs and install in cylinder head (if removed). See Figure. Before installing valve cover and gasket, apply sealant at front and rear areas of cylinder head. See Figure.
  11. 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. Tighten all fasteners to specification. Fill cooling system and adjust control cables.
Fig 2: Camshaft Bearing Cap Bolt Installation Sequence
G98B07912Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002