The Toyota Sienna is a minivan with front-wheel drive. The 2006 model is a second-generation Sienna, which features a six-cylinder 3.3-liter engine with a double overhead camshaft. It uses a timing belt to ensure that the cylinders fire at the correct point in their cycle. The replacement of the timing belt is part of normal vehicle maintenance, as this part wears out periodically.
Disconnect the cable from the negative battery terminal with a socket wrench. This prevents anyone from unintentionally starting the engine during the timing belt replacement.
Disconnect the windshield wiper arm assemblies with a socket wrench. Remove the cowl panel and its seal. Detach the windshield washer hose, and disconnect the cowl top louvers. Unplug the electrical connector for the windshield wiper motor and disconnect the cowl top panel.
Raise the vehicle with a jack and support it on jack stands. Disconnect the right front wheel with a lug wrench. Remove the bolts for the accessory drive belt and remove the drive belt. Detach the electrical connector for the alternator and loosen the mounting bolts for the alternator. Remove the alternator.
Disconnect the mounting bolts for the power steering pump and remove its drive belt. Detach the coolant reservoir hose. Disconnect the diagnostic link connector from the No. 2 right mounting bracket for the engine. Disconnect the engine's right mounting stay, moving control rod and No. 2 right mounting bracket.
Remove the bolt for the crankshaft pulley with tools 09213-54015, 91651-60855 and 09330-00021. Pull the crankshaft pulley from the crankshaft with tools 09950-50011, 09952-5010, 09953-05010, 09953-05020 and 09954-05020.
Disconnect the lower cover for the timing belt with a socket wrench. Remove the guide for the timing belt from the crankshaft. Release the clamps on the the upper timing belt cover and disconnect the upper timing belt cover. Remove the right mounting brace for the engine. Install the bolt for the crankshaft pulley temporarily.
Turn the crankshaft clockwise to align the dimple on the crankshaft sprocket with the notch on the oil pump. Disconnect the tensioner for the timing belt and the timing belt.
Install the new timing belt on the crankshaft sprocket, water pump pulley, left camshaft sprocket, No. 2 idler pulley, right camshaft sprocket and No. 1 idler pulley in that order. Push the pushrod into the housing for the timing belt tensioner with vertical press 98,1-9807 to align the holes in the tensioner housing. Place a 1.27mm Allen wrench to hold the pushrod in place and release the vertical press.
Install the tensioner for the timing belt and tighten the mounting bolts to 20 ft. lbs. with a torque wrench. Remove the Allen wrench from the housing on the belt tensioner and turn the crankshaft clockwise two complete turns so that the timing marks align.
Remove the bolt for the crankshaft pulley with a socket wrench. Connect the right mounting bracket for the engine and tighten its bolts to 21 ft. lbs with a socket wrench. Install the upper cover for the timing belt and connect the guide for the timing belt so that its cup side faces down. Connect the lower cover for the timing belt.
Install the crankshaft pulley with tools 09213-54015, 91651-60855 and 09330-00021. Tighten the mounting bolts to 159 ft. lbs. with a torque wrench. Perform steps one through four in reverse order to install the additional components. Start the engine and check for oil leaks.
