OEM 2005 Scion xB Timing Chain

2005 Scion xB Timing Chain Parts Q&A

• Q: How to replace the timing chain on 2005 Scion xB?

  A: You must start replacement of the timing chain by first taking out the front wheel RH and subsequently removing the 4 nuts from the cylinder head cover No. 2. Start by disconnecting ignition coil No.1 by pulling out its 4 ignition coils after removing their 4 securing bolts. The cylinder head cover sub-assembly can be taken out after removing 9 bolts combined with 2 nuts and disconnecting the ventilation hoses from both sides of the cover. The next step requires elimination of the fan and generator V-belt then removal of the generator assembly before proceeding with draining engine oil and coolant and removing engine under cover RH. The worker needs to align the timing marks and use Special Service Tools 09213-58012 (91111-50845), 09330-00021 to remove the crankshaft damper sub-assembly pulley bolt. The damper can be taken off with Special Service Tool: 09950-50013 (09951-05010, 09952-05010, 09953-05020, 09954-05021). Remove the oil control valve connector and its bolt and the valve along with the O-ring. Detach the crankshaft position sensor and engine mounting insulator sub-assembly RH by setting a wooden block on a jack under the engine before removing the bolt securing the liquid tube followed by taking 5 bolts and a nut along with the bolt fixing the mount pad. Start by removing the 4 bolts securing the transverse engine mounting bracket then proceed with taking out the oil pump assembly together with its seal. First rotate the camshaft counterclockwise 40 degrees from TDC before proceeding with removing chain tensioner assembly No. 1 while keeping the crankshaft from rotating due to the missing tensioner. Insert the plunger of the tensioner while using a 2.5 mm (0.098 inch) diameter bar for stable holding. The chain tensioner slipper and chain vibration damper Number One needs removal so you can pull out the disjointed chain components. Installation requires positioning the crankshaft to ATDC 40 to 140 degrees then correctly positioning the intake and exhaust timing sprockets at ATDC 20 degrees before resetting the crankshaft to ATDC 20 degrees. The chain vibration damper receives 2 bolts implemented with a torque of 9.0 Nm. Subsequently, align the matchmarks between the camshaft timing sprocket, camshaft timing gear, and crankshaft timing sprocket before installing the chain tensioner slipper and chain tensioner through bolts tightened to 9.0 Nm. Use the bar removed from the chain tensioner to measure the proper tension of the timing sprockets between intake and exhaust camshafts. Before installing the oil pump seal with Special Service Tool: 09950-60010 (09951-00250, 09951-00380, 09952-06010), 09950-70010 (09951-07100) you should place the oil pump assembly then the water pump assembly. Fit the transverse engine mounting bracket using 4 bolts at 55 Nm torque value followed by engine mounting insulator sub-assembly RH with 5 bolts and a nut where Bolt A receives 45 Nm torque and Bolt B achieves 52 Nm torque while Nut acquires 52 Nm torque then finish with a bolt installation of the liquid tube at 9.8 Nm torque value. Lay down the camshaft timing oil control valve assembly with its new O-ring first (Torque: 7.5 Nm) and afterward set the crankshaft position sensor and water pump pulley and crankshaft damper sub-assembly (Torque: 128 Nm). Seal packing (Part No. 08826-00080 or equivalent) needs application to the cylinder head cover sub-assembly before installation with 9 bolts and 2 seal washers and 2 nuts (Torque: 10 Nm). Reinstallation of ignition coil No. 1 (Torque: 9.0 Nm) and cylinder head cover No. 2 (Torque: 7.0 Nm) follows. Allow the generator assembly and the vane pump V-belt and the fan and generator V-belt to mount back into the system, conducting adjustments when required on both belts. The first step requires inspection of drive belt deflection and tension before installing the new gasket on the oil pan drain plug (Torque: 38 Nm) followed by engine under cover RH installation (Using 5.0 Nm torque for bolt and nut). After completing the tasks end with engine oil addition and leak inspection before adding engine coolant and confirming no coolant leakage.