These engines, are challenging to work with and need tools that are unique to this type of engine. During any activity involving the timing chains, special precautions should be taken because careless disassembly will result in impact on the engine. Because this is an interference engine design, a failed timing chain will likelihood affect the valves and likely, the piston of the said cylinders which will require the cylinder heads to be pulled. The timing system is delicate, and if not set right, it may lead to terrible destruction of the engine; as such, this type of repair is best undertaken by experienced mechanics, and, if there is any doubt at all, it is advisable to consult with an expert. Check all work before starting the engine, then check it again. For the procedure, two special camshaft holding tools are needed in order to grip the camshaft. Starting up, remove the battery cable, the valve cover, the timing chain cover among others. Replace the crankshaft sprocket bolt and set the engine at TDC for cylinder number 1 using the fact that this position will be roughly TDC at this stage. Rotate the engine clockwise until marks on each intake camshaft VCT unit are aligned with degrees, those with cylinder heads. Take out the bolts that hold the valve train oil tubes and with these, put the special camshaft locking tools. If the timing marks on the part of the timing chain are not prominent or visible, one is supposed to create paint dot. Umber the main timing chain tensioner and the lower chain guides and the bolts that fix the VCT solenoids should be removed while taken in poly bags labeled according to their position. Discharge the first timing chain, as well as the upper chain idlers. The camshafts are operated by a second chain of timing and in order to access three units at the top of the engine known as the VCTs, the tensioner of the timing chain must be locked. If replacement of the primary timing chain sprocket is intended, it is necessary to remove the bolts fixing the channel plate. For installation, the areas where the sprocket and plate are to be fitted should be cleaned so that there is tight connection; if the gasket has been removed then a new one is fitted. Timing chain tensioners shall be replaced with new ones, if the old ones have been removed and the engine type is a secondary timing chain. The unit is positioned correctly when a snap is felt and the tensioner shoe is then set into the place. Position the colored links of the secondary timing chain against the marks noted on the VCT units and fit the chain, making certain that the VCT units locate with the dowel pins on the camshafts. New bolts for the VCT units; torque to the following value: Like the secondary chains or VCT units, place the primary timing chains by lining up the coloured links with the marks on the sprockets. After all the components are installed they have to be aligned, release the pins which hold the primary chain tensioners back, the other parts need to be put back in the reverse manner. Slowly spin the crankshaft counterclockwise manually through not less than three full cycles and should some amount of friction be encountered on any of the cylinders, the spinning must stop so that faults might be assessed. Last but not the least replace the old oil filter, refill the engine oil and coolant and take the vehicle for the road test to check for oil leakage.