OEM Scion Timing Chain

Scion Timing Chain Parts and Q&A

• Timing Chain
  13506-0H011
  Q: How to inspect the timing chain and what steps should be taken for replacement on Scion tC?

  A:

  Start by checking the No.1 chain tensioner through an inspection of plunger movement and pawl ratchet function before and after release. Vernier caliper measurements of 16 chain links should be taken to determine replacement based on 122.6 mm (4.827 inch) elongation limit. Measure the tensioner slipper wear because replacement should occur when the wear threshold reaches 1.0 mm (0.039 inch). The measurement of wear on the No.1 chain vibration damper should be conducted for replacement when it reaches above 1.0 mm (0.039 inch). A diameter measurement of the crankshaft timing sprocket with the chain wrapped should be less than 51.6 mm (2.031 inches) to require a replacement of the chain sub-assembly and crankshaft timing sprocket. When measuring the oil pump drive gear diameter with a chain it should be replaced if the measurement comes out to less than 48.2 mm (1.898 inch). Replace the oil pump drive shaft gear together with the No. 2 chain sub-assembly when the shaft gear diameter measures below 48.2 mm (1.898 inch). The procedure for replacement requires tapping out the timing chain cover oil seal with a screwdriver and a hammer. Use the retainer on wooden blocks as you drive the new oil seal into place with Special Service Tool: 09223-22010 and a hammer until it reaches full flush with the timing gear case edge. Clean the lip before installation and appropriate MP grease should be applied on the lip surface.
• Timing Chain
  13506-21050
  Q: How to replace the timing chain on 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.