The timing system is sophisticated, and one is in big trouble if they get it wrong; as such, only professionals should attempt this process and one should seek professional advice if in doubt. Before detaching the timing chain(s) from its/their sprockets, make sure that all sprockets possess timing marks; in the absence of a mark on the crankshaft sprocket, a particular tool (EN 46111) must be used. This procedure requires two special tools to lock the camshafts, namely the part numbers for these tools are; part no 46105-1 and part no 46105-2. This can be done by first disconnecting the negative terminal of the battery, then, relieve the fuel system pressure, drain the engine coolant, then remove the drive belt with the tensioner . Go ahead and pull the lower intake manifold, valve covers, water pump, power steering pump, crank shaft pulley then the crank and camshaft position sensors. Pull M15 connectors off the camshaft position actuator valves, delete the thermostat housing and unscrew the timing chain cover. Run the 10 mm x 1.5 mm bolt in the cover to loosen it lightly from the block and adjust the crankshaft sprocket with the timing mark on/with the oil pump housing. Check the camshaft timings before releasing the bolts of the timing chain tensioner and the guides of the timing chain. Do the same for the lower timing chain and the timing chain for the other cylinder head, the tensioners very sensitive. Check the timing chain cover for any signs of rust and clean all of the parts also check the guides and sprockets for wear or damage. Release the tension of the straps and make sure that the tensioners remain in their respective status, which is the retracted one. Before starting the engine the crankshaft should be rotated by hand with slight resistance to determine some problems. Position the crankshaft sprocket in such a manner that the Woodruff key is showing, and its timing marks are also properly visible; position the timing chains and guides and tensioners in their proper positions and align properly. Remove the old sealant form the block and cover, place a new seal down then apply RTV sealant before placing the timing chain cover, then fasten the bolts in the proper sequence. Last but not the least, the rest of the installation is in the exact opposite of the removal process.
