Mercury 3L8Z-6256-AA Sprocket - Camshaft

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It is only advisable to remove the tensioner as a step that goes hand in hand with the timing belt change, in this way, once the belt tension has been disrupted, the valve timing is correctly realigned. There is tensioner to be removed and checked and many professionals will advice that the tensioner assemblies be replaced as a whole whenever the timing belt is to be replaced. The only special operation, which is required after removing the old tensioner is the installation of the new tensioner. In the case of the camshaft and crankshaft sprockets, removal of any of the sprockets means that the belt tension has to be released and in the process the whole timing belt of the vehicle must be replaced to ensure correct the required valve timing. In the case of its removal, camshaft sprockets can be released from the place with the help of their retaining bolts once the timing belt is off; it is advisable to take some time and label the sprockets for orientation. The crankshaft sprocket can be pulled off by pulling on this bolt, recommended to remove the crankshaft pulley and timing belt with FRONT marking on the sprocket and paying attention to the installation direction of the thrust washer. The sprockets need to be inspected and installation process is the reversal of the removal process with tensioning of the timing belt. For the timing belt guide pulleys the upper guide pulley, one can get access by removing the upper and middle covers while the lower guide pulley, (for early models) will need access from the lower cover. The guide pulley bolt should be unbolted, and a lot of precaution is needed in order not to discard the timing belt from the sprockets. The condition of the pulley(s) should be inspected and many mechanics also suggest the guide pulley assembly should be replaced when doing a timing belt replacement. If the pulley bolts are removed then installation is the procedure followed whereby the bolts are tightened until they get to the correct torque setting.

For engines up to 3.5L, the procedure may only be performed with the engine removed: omit the steps that do not apply. For 3.0L engines, start by pulling off the timing chain cover and shifting the crankshaft position sensor trigger wheel from the crankshaft; the position of the pulse wheel must be remembered to be reused later. Take out the spark plugs and then fit the crankshaft pulley and bolt; rotate the crankshaft till the position of the key way is at 11 O'clock for TDC number 1 cylinder. Checking of TDC can be done by aligning index marks available on the camshaft sprockets, if two index marks are not aligned then the crankshaft should be turned and checked again. Sustain it by labeling chain links in case, rotate crankshaft to align camshafts to their no operation position, and lastly by removing all the VCT assembly mounting screws. Go ahead to dismantle the tensioner of timing chain along with timing chain arm, lift the rear timing chain off the cam sprockets and then slipping off the sprocket on crankshaft. Turn the crankshaft 600 degrees in anticlockwise directions in order to position the front camshafts to their middle zones and then pull out the front timing chain tensioner and chain. If necessary, it is possible to remove the sprocket of the crankshaft. Owing to 3.5L engines, two special bearing holding tools are necessary, and it is recommended to change the water pump in the process. Take off the timing chain cover, put back the crankshaft sprocket bolt and turn the engine until it is at TDC for cylinder number one. Put on the camshaft holding tools, unbolt the VCT assembly, and the primary timing chain tensioner and arm. Place the timing chain on a chain clipboard and then unlock the primary timing chain and then remove the upper chain guide. When secondary timing chains are the objects of inspection, firmly compress the tensioners, then remove the sprockets and the chains. For 2.7L engines, remove the negative battery terminal, the valve cover and the timing chain cover, and tighten the crankshaft pulley bolt. You need to rotate the engine to confirm timing marks, then unbolt the right-side tensioner and guide, lift the timing chain off and slide the crankshafts' outer sprocket off. The same for the left-side chain with the necessary alignment of the timing marks. In order to remove the VCT units, some special tools are needed to lock the camshafts, next the center bolts of the VCT units need to be detached and the units themselves can be slid off. Clean and check for wear and tear on any of the parts and remove any parts which are not in good condition. The procedure of installing timing chain tensioners is as follows, which is almost the reverse of the removal process: make sure that tensioners are fully compressed prior to assembling the housing. Ensure that the timing marks are aligned as earlier labeled, fit the VCT housings, and ensure that there is no interference when the engine is turned on. Last but not least, the timing chain cover should be fitted again, the engine flooded with oil and coolant as in the beginning, and after starting the engine, it should bechecked for leaks.

Remove the timing chain cover and slide the crankshaft position sensor trigger wheel off the crankshaft.

Ensure you are highly experienced with this type of repair. If unsure of your abilities, consult an expert. Double-check all work and ensure everything is correct before attempting to start the engine.