Before performing this procedure get two 6 x 1.0 mm bolts 16 to 20 mm long which are commonly referred to as service bolts. It is recommended to begin with the removal of the valve covers and measuring the lift of the valves and clearance before removing the
Timing Belt. If cylinder head work that includes the valves is expected to be carried out, do not measure the clearances at this point. It should be noted that the crankshaft of the specimen must be placed at the angle of 45 degrees TTDC. Next, extract the cam sprockets and the camshaft position sensor out of the engine compartment. For the removal of the camshafts on each cylinder head, firstly locate the right bank cylinder head and make sure that the exhaust camshaft sub-gear is fixed to the driven gear by a service bolt and turn the camshafts in such a manner such that it is in a position that is set approximately 10 degree from the initial position. Position the cam at the top with the two key holes aligned vertically and bring the cam out to contact the drive and driven gears; timing mark on the right side cylinder head should be at an upward 10 degree angle. Turn the camshaft bearing cap bolts by 1/4 turn until they can be undone by hand, in the reverse of the sequence applied. The bearing caps, oil feed pipe and camshafts must be unbolted, lifted using the fingers and placed on a bench with the patented shape end up to reduce the chances of damaging them. The same is done for the left bank cylinder head and the gears are set by camshaft provided that they are not set at a 10 deg angle. Carefully mark each bolt so that you will be able to have them correctly aligned when assembling the bearing caps back again. If necessary, lifters and shims should be removed with a magnetic tool and placed in another place. Screw the hex bolt and remove the timing tube assembly; you also have to release the screw plug, along with its sealing washer while the intake camshaft must be mounted on a vise. To get to the exhaust camshaft, it is possible to eliminate the drive gear from the timing tube assembly which is screwed on four bolts. According to the manual, to disassemble an exhaust camshaft gear, place the cam in a vise and the use the pin spanner to turn the sub-gear clockwise so as to remove the service bolt and the snap ring. The wave washer, sub-gear and camshaft gear spring can then be successfully withdrawn. For installation, use new camshaft plugs in the cylinder head with a little amount of the RTV sealant, new oil seal should be fitted and the drive gear mated to the timing tube. To put the exhaust camshaft gear back in, place all the necessary parts and cover the lifters with grease or engine assembly lube before putting them back in their correct positions. Using a light grade of oil, oil the cam lobes, bearing journals, and tooth faces of the gear, arrange the intake and exhaust camshafts with the timing surfaces set at 10 degrees for the right bank and the same for the left bank. Place RTV sealant on the bearing cap interface componants while the engine is upright, install the bearing caps sequentially, and torque the bolts to 90 degrees in a star pattern. For the service bolt of the exhaust cam gear, remove it and replace the new camshaft oil seal on both the cylinder heads. Replace the timing belt and inspect the valve outcomes; the other parts should also be reinstalled in the reverse manner. Before replacing the valve covers, apply RTV sealant on the surfaces to be connected, and finally replace the cooling system. Then, start the engine and look for evidence of leakage or Signs that the motor is running in the right manner.