Specific tools are required to achieve this process, thus it is wise to read the whole process and get the right tools in place before performing the task. There are three timing chains for precise control of valve time; the major timing chain connects the crankshaft sprocket to the idler gear sprocket; the secondary timing chains join the idler gear to the camshaft sprockets. Timing system is rather delicate and in case of mistakes, serious damage to the engine can be caused; so this procedure is recommended only for highly qualified personnel; everything should be checked twice before the engine is engaged. Start with having the piston of cylinder number one at the top dead centre of compression stroke, at the same time, remove the negative cable of battery, drain the coolant, and then take off the drive belt, the engine cooling fan and the shroud of the fan. Remove the heater hoses and the lower radiator hose, unbolt the power steering pump, you do not have to disconnect the lines, you can also remove the alternator and air conditioning compressor if the vehicle has those amenities and the final thing is to remove the accessory drive belt tensioner. Take out the valve covers and sparking plugs, next to the
Rocker Arms so that there could be cutting of the camshaft sprocket and no contact could be made with the pistons valves are present. Which is exhaust strokle Remove the camshaft position sensor, Set the No.1 cylinder piston at TDC on exhaust stroke and then pull the crankshaft damper/pulley, timing chain cover along with water pump assembly fasteners but before that it is essential to mark some of the bolts for the time being. Place a piece of shop rags over the oil pan opening, push the primary timing chain tensioner to the lowest position and remove the secondary timing chain tensioners. Remove the camshaft sprocket retaining bolts and then gently pull the camshaft sprockets this will enable the secondary chains to drop in between the timing chain sprockets. To dismantle, do away with idler sprocket bolt so as to come off idler sproacket, crankshaft sprocket, and timing chains simultaneously, other preliminaries include removing cylinder head access plugs and oil fill tube, lastly separating the timing chain guides and tensioner arms. Examine the condition of the camshaft and crankshaft sprockets, as well as camshaft and crankshaft chains , cracks or excessive wear may be present here, and carefully study the state of the tensioner and its components. If any of these parts appear worn out they should be replaced, the tensioner lube jet should also be cleared if required. Before turning on the engine, the crankshaft must be manually turned around two complete revolutions to prevent any problems. If the primary timing chain tensioner was removed reconnect it in locked mode; compress an engage the secondary timing chain tensioners before installing them on the engine. Check the right timing chain is fitted and fit the timing chains to the idler sprocket Then fit the main timing chain. Cover and oil the idler shaft and bushing before putting in the idler sprocket, crankshaft sprocket and the timing chains as a single unit on the engine. Ensure that sprockets on camshafts match their chains, ensure that the bolts are cleaned and that the washers have been lubricated before being fitted. Ensure all links fit the adjacent marks are correctly established, release the locking pins of the tensioners and turn the engine to double check the marks. Lastly, the camshaft sprocket bolts will be tightened, the timing chain cover and the engine block will be cleaned, the timing chain cover, and the gasket installed while following the correct sequence of tightening, for a fully completed, the removal steps will be reversed with pipe sealant to the cylinder head plugs to shut oil leakage, the engine oil, and the filter will be replaced as well the cooling system.