Ford F4TZ-6250-B Camshaft

To remove the lifters, first take off the valve cover and pushrod cover, then remove the applicable rocker arm(s) and pushrod(s) for the lifter(s) being taken out; if the camshaft is also being removed, all lifters should be taken out. Use a retrieval tool to extract the valve lifter(s), especially if the engine has high mileage, and keep them in order or mark them for reinstallation in their original positions. Inspect the lifters to determine if further disassembly is necessary. For the camshaft, position the engine at TDC compression for the number one cylinder and remove the distributor, followed by the valve lifters and timing cover. Before removing the camshaft, check for endplay and wear on the timing gears, replacing any worn components during reassembly. Ensure the timing marks are aligned; if not, turn the crankshaft until they are. Remove the camshaft thrust plate retaining bolts and carefully pull the camshaft from the engine block, avoiding damage to the lobes and bearings. Inspect the camshaft and bearings, replacing any worn parts as needed. If necessary, remove the gear from the camshaft. For installation, if the camshaft gear was removed, install it back onto the camshaft, and if a new timing gear is used, replace the corresponding crankshaft timing gear as well. Apply camshaft installation lubricant to all lobes and journals before installing the camshaft, ensuring proper alignment of the marks on the camshaft and crankshaft gears. Install the thrust plate bolts and tighten them to the specified torque. The rest of the installation follows the reverse order of removal. After installation, start the engine to check for leaks and adjust the ignition timing. For the lifters, lubricate their bottoms with engine assembly lube and install them, ensuring original lifters go back into their original bores, completing the installation in reverse order of removal.

Lifters might be extracted after the intake manifold and valve covers have been duly removed. Tighten the spanner for half a turn and then turn the rocker arms to the side, to finally remove the push rods. If you have roller lifters, remove the lifter guide retainer and lifter guides and make notation of their positions to install them later. If the valve lifters are clean of varnish or wear, employ an external magnet to remove the lifters, so they would be in place when required. When the lifters are stuck it may require a special tool to eject them. Check the lifters and go further if no further disassembly is required. Some of the parts that need to be accessed include the camshaft, distributor and lifters for which procedures such as the following apply: After that gently pull out the valve lifters and then take out the radiator and the condenser if fitted, then the timing cover. When the camshaft is to be removed, it is advisable to inspect the end play and the timing chain as well, in case either requires replacement during reg assembly. Have both the timing chain and sprockets pulled out, the bolts that holds camshaft thrust plate to the engine block ought to be unbolted. After slowly pulling the camshaft outwards while avoiding the lobes from getting stuck in between the bearings, the check, and replace worn out camshaft parts. For installation, it is necessary to apply installation lube at the journal and the lobe of the camshaft, then putting the camshaft in the place, placing the thrust plate and tighten the bolts to the torqued value. Measure the camshaft endplay and adjust excessive measurements with a spacer check that the spacer has been installed or replace the thrust plate. If the same lifters are to be used apply engine assembly lube to the bottom of the lifters then fix them back into the bore. The rest of the installation procedure is a reverse of the removal procedure described above. Last of all, turn on the engine and look at spots as well as for oil and fuel leakage then, ignition timing.

To investigate additional end play, and to assess lobe lift, unbolt the valve covers and the rocker arm assembly but leave the push rods in overnight. Turn the engine until the first push rod is on the top dead centre of the compression stroke and instal the dial indicator where it fits snugly on the piston. In setting the tappet clearance, and after zeroing the dial indicator, turn slowly the crankshaft until the needle deflection stops and changes direction but record the maximum cam lobe lift. With the pistons at TDC on the compression stroke record this measurement and move each piston to TDC and do this for each valve. Having made these checks, it is recommended to cross-check them with such specifications; if camshaft lobe lift readings are below the specified values, it means that the camshaft is worn out and requires replacement. As for removal, a person shall disconnect the negative battery terminal, drain the cooling system and engine oil besides the removal of such components as the radiator, fan, drive belt, spark plug wires, ignition coil pack, alternator as well as the engine. On certain models, the following part are also to be detached, the oil pump drive gear, the camshaft position sensor, the intake manifold, the valve covers, the rocker arms, the push rods, valve lifters, the oil pan, the timing chain cover and the timing chain and sprockets. Probably, unscrew the camshaft thrust plate bolts and very gently, try to pull the camshaft out of the block without damaging the bearings. After removal clean and inspect the camshaft bearing journals for wear or damage, as described below Telescoping gauge and micrometer. If the journals are heavily worn or ovalised then one has no option but to overhaul the camshaft. If the lobes are not worn or unsightly, then the camshaft can be reused; otherwise, it is likely to be thrown away. Make sure that the oil ways are free from any debris than apply oil to the camshaft bearing journals and lobes with assembly lube and install the camshaft gently to avoid deforming the bearings. Place the thrust plate with lube and fasten the bolts in a correct torque; perform the process inversely to the removal process and fit the other camshaft position sensor if required.

To find out the degree of deterioration of the cam lobes, one has to check the lobe lift before camshaft extraction and this requires that the two valve covers be removed while using specifications. Starting with the removal of the battery cable then you drain the engine coolant, the radiator, grille, intake manifold, valve covers should also be removed. Relax the rocker arm nuts and turn the rocker arms aside and take pushrods out. Remove the valve lifters with the help of the special equipment or a magnet if they are seized. If they are lodged, an internally engaging tool for lifters may be needed, as designed to remove them. Subsequently, unscrew the timing cover, the chain, the gears and the oil pan before gently pulling the camshaft from the front of the engine risking the bearings. Check the lifters and the camshaft, the camshaft bearings in the block may need replacement if worn, see an automotive machine shop for new bearings. Before fitting, the cam lobes and bearing surfaces should be coated with the camshaft installation lube; while fitting the camshaft, great care should be taken. To reinstall, reverse the order of removal, change the engine oil and oil filter and fill it with the specified type and quantity of coolants. Last but not least, start the engine and look for any signs of leakage and ensure all the aspects related to the engine performance are okay, including the ignition timing and the idle speed should be brought back to the set standard.

Follow the timing procedure for each camshaft, using the special tools.