OEM 2008 Scion xB Camshaft

2008 Scion xB Parts Questions & Experts Answers

• Q: How to install the camshaft on 2008 Scion xB?

  A: The installation of the camshaft begins with aligning the timing gear and camshaft while the straight pin remains separate from the key groove followed by slow gear rotation while applying gentle pressure until the pin slots into position. Avoid rotating the gear toward the retard angle direction. Tighten the flange bolt to 551 kgf-cm (54 Nm, 40 ft-lbf) after ensuring the camshaft and gear fringe have no spacing. Check if the camshaft timing gear can reach the retard angle side while being securely locked into the most retarded position. You must apply a light distribution of engine oil to the camshaft journal before you install the timing chain onto the camshaft timing gear with the paint marks facing the timing marks. After that you should check the front numbers and marks before inserting the bearing caps into the cylinder head. After applying oil to bearing cap bolts and their threads and bolt heads uniformly tighten the 10 bearing cap bolts by first following the specific sequence to reach 9.0 Nm for the No. 3 bearing and 30 Nm for the No. 1 bearing. The oiling procedure should begin with the journal portion before aligning the chain paint mark to the camshaft sprocket timing mark followed by set bolt tightening for the camshaft timing sprocket and marks and number verification before bearing cap installation. Saturate the bearing cap bolt threads and their heads using engine oil followed by equal and uniform tightening of the 10 bearing cap bolts with No. 2 bearing at 30 Nm (301 kgf-cm, 22 ft-lbf) and No. 3 bearing at 9.0 Nm (92 kgf-cm, 80 in-lbf). Then hold the camshaft with a wrench while tightening the camshaft timing sprocket set bolt to 54 Nm (551 kgf-cm, 40 ft-lbf) without damaging the valve lifter. The paint marks on both the chain and the camshaft timing gear and camshaft timing sprocket must align with their respective timing marks. Additionally, the crankshaft pulley groove must be directly in line with the timing mark zero located on the timing mark chain cover. The installation of the No. 1 chain tensioner assembly requires releasing the ratchet pawl while pushing in the plunger and hooking it to the pin followed by installing new gaskets and fastening two nuts until torque reaches 9.0 Nm (92 kgf-cm, 80 in-lbf). During post-installation the crankshaft should be turned counter-clockwise to remove the plunger knock pin from its hook position before turning it clockwise to verify the plunger extension position. Install the cylinder head cover sub-assembly by removing old packing material then applying Toyota Genuine Seal Packing Black or Three Bond 1207B or equivalent to specified locations before installing the oil pan within 3 minutes and avoiding engine oil additions for at least 2 hours post-installation. Install the cylinder head cover using 8 bolts and 2 nuts, apply torque of 11 Nm (112 kgf-cm, 8 ft-lbf) to Bolt A while Bolts B requires 14 Nm (143 kgf-cm, 10 ft-lbf) and the nut requires the same torque of 11 Nm (112 kgf-cm, 8 ft-lbf). The engine wires should be installed with 2 bolts at 8.4 Nm (86 kgf-cm, 74 in-lbf) and 2 ventilation hoses must be attached to the cylinder head cover. When completing the installation sequence you should perform a spark plug and ignition coil assembly assembly before checking for oil leaks then verifying ignition timing and finally taking out the No. 1 engine cover sub-assembly and installing the rear engine under cover RH.