One should exercise caution since turning the crankshaft or
Camshaft alone when timing belt has been taken off may be damaging the valves; it should only be gently turned to the timing belt position to adjust the camshaft alignment tool. This procedure needs two special tools, and they should be procured in advance. It is illustrated with the help of a DOHC engine but the stages are the same with SOHC engines with certain differences in the appearance of the parts and the places of the fasteners. Timing mechanism is complicated and errors may cause some serious engine damage hence only those who have done this before are supposed to engage in this process. Unplug the negative battery connection, being sure to have the anti-theft radio code, and keep in mind that disconnection of battery can lead to driveability problems and warning signals. Lift the vehicle safely, take off the lower splash shield and place the radiator support panel in order to have access to the engine. Lift the engine cover, spark plugs, and any other parts that are required such as the cooling fan and power steering pump pulley. Unscrew the timing belt covers, TDC rotate engine and attach TDC locking tool. Take off the crankshaft pulley and timing belt lower timing belt cover and make a mark on the timing belt (unless it is being replaced). Unscrew the position of the tensioner of the timing belt and take the timing belt off. Loose the camsprockes so they can swing freely and in case of necessity, remove the crank sprocket. Check the timing belt and other parts to be sure they are not worn out or contaminated and install new damaged parts. Check the crankshaft during installation by giving it a hand turn so as to detect any resistance, which is a sign of complications. Install any sprockors that were removed and make sure that they are rotating freely and loop the timing belt under crankshaft sprocket and connect it correctly. Tension the belt based on the type of engine and follow up on the appropriate tension and alignment before completing the installation of all the parts in the reverse order.