Mercury F4TZ-6250-B Camshaft

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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.

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.

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.

Camshaft bearing replacement requires special tools and expertise that place it outside the scope of the home mechanic. Take the block to an automotive machine shop to ensure that the job is done correctly.

Adjust the ignition timing.

The lobe lift should be checked prior to camshaft removal. Follow the procedure, but note that it will be necessary to remove both valve covers and use the specifications.

Check camshaft endplay and timing chain for wear. If measurements indicate worn components, replace as required during reassembly.

The remaining installation procedures are the reverse of those for removal.

Measure the bearing journals with a micrometer to determine their size and whether or not they're out-of-round. The inside diameter of each bearing can be measured with a telescoping gauge and micrometer. Subtract each cam journal diameter from the corresponding bearing inside diameter to obtain the bearing oil clearance. Compare the clearance for each bearing to the Specifications. If it's excessive for any of the bearings, have new bearings installed by an automotive machine shop.

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

Clean it with solvent and dry it, then inspect the bearing journals for uneven wear, pitting, and evidence of seizure. If the journals are damaged, the bearing inserts in the block are probably damaged as well. Both the camshaft and bearings will have to be replaced.