Mopar 5019423AC Chain-Engine

Preparation for this work requires special tools, so be sure to read this entire technique and acquire these tools before starting. For the correct valve timing, the engines incorporate three timing chains of which the main timing chain the crankshaft and pistons together with the idler gear while the two other secondary timing chains attached on the camshaft sprockets. First, get the piston number 1 cylinder at the top of the compression stroke, then remove the negative terminal of the battery, and drain the cooling system, then the drive belt also remove the engine cooling fan and shroud. Disconnect the heater hoses and the lower radiator hose from the timing chain cover, remove the power steering pump without disconnecting the fluid, and the alternator, and the air conditioning compressor if fitted. The camshaft sprocket aligning requires the accessory drive belt tensioner, valve covers, spark plugs, and all the rocker arms to be uninstalled to avoid piston striking of the valves. The camshaft position sensor is located high on the driver side valve cover and can be simply unbolted and removed, the piston number one has be at TDC on the exhaust stroke, the crankshaft damper/pulley, timing chain cover and water pump assembly will need to be removed. Put shop rags over the oil pan opening; retract the primary timing chain tensioner; and disconnect both secondary timing chain tensioners. To do this, you have to unscrew the camshaft sprocket retaining bolts, then take off the camshaft sprockets though you have to hold the camshafts as they turn. Loosen and take off the idler sprocket bolt and along with the idler sprocket, crankshaft sprocket and timing chains as a combine unit. Camshaft and crankshaft sprockets should also be checked for wear, the chains should be checked for cracks and tensioner components should be checked for signs of wear and major portions replaced. While installing the part make sure that the timing chain guides and the tensioner arms are fitted properly and the primary and secondary timing chain tensioners are fixed properly. Slide and fit the timing chains and the links correctly in place with the help of the idler sprocket, and fit the sprockets properly to the camshaft hubs. After the bolts have been removed and before reinstalling them, wash them and grease them as well, ensure that all the links of the timing chain are in order, and manually turn the engine in order to align the timing marks. Last but not the least, replace the timing chain cover and make sure that all parts are properly fixed; the engine oil and the cooling system should be replaced.

There are special tools used to do this process, it is wise to read the whole process then go and gather the necessary tools. On the 3.7L V6 engine, for adequate valve timing there are three timing chains; one is the primary chain that connects the crankshaft sprocket and idler gear sprocket while two other chains are the secondary chains that join the idler gear to the camshaft sprockets. First unhook the negative battery terminal, evacuate the coolant, and then take off the cooling fan, the emission accessory drivebelt, and the fan shroud. Remove the heater hoses and lower radiator hose, remove the power steering pump but not the fluid, if there's an alternator and air conditioning compressor remove them too. Raise the accessory drivebelt tensioner, reduce the valve covers and spark plugs as well as all the rocker arms for the purpose of aligning the camshaft sprocket. Unbolt and pull out the camshaft position sensor, lay the number one piston at the TDC on the exhaust side, unbolt the crankshaft damper/pulley, timing chain cover with water pump as a single assembly, and place a mark on the bolts for reinstallment. Place layers of rags over the top of oil pan opening, deactivate the primary timing chain tensioner and take off the secondary timing chain tensioners. Remove the camshaft sprocket retaining bolts and very gently, utilizing the camshaft sprockets pulling on the secondary chains to reluctantly fit between time chain guides. Take off the idler sprocket bolt and then pull off the idler sprocket, crankshaft sprocket with the timing chains. Check states of cam sprockets, crank sprockets, chains and tensioners and replace the wearing out ones. For installation, reconnect the timing chain guides and tensioner pivot of the arms readjusting the proper torque and using the compound thread lock. Shorten and fasten the secondary timing chain tensioners and be certain that you fit the correct tensioner on the chain. Place timing chains into the idler sprocket and aligning the respective links; fit the main timing chain. Grease the idler shaft and bushing and then put the idler sprocket, crank shaft sprocket and the two timing chains together with an assembly and fit them onto the engine. Remove the bolt from the idler sprocket, and clean it before installing, make sure that the camshaft sprockets are placed in there right positions so as to enable the right rotation for the installation. Torque the camshaft sprocket bolts, make sure that all the timing chain links are correctly in place and remove locking pins from the tensioner. With the engine at TDC turn the engine two revolutions to double check the timing marks, then tighten the camshaft sprocket bolts. Remove any deposits on the timing chain cover and the engine block, set the timing cover and gasket in position and bolt the latter securing them with the required amount of torque. The rest of the installation work is done in reverse of the removal process and pipe sealant is applied on the cylinder head plugs to avoid dripping of oil.