Ford 7T4Z-6250-B Camshaft

If the camshafts have to be removed for any procedure, it is better to check the valve clearances prior to disassembly in order to order new lifters, if needed, from a dealership. Start with the timing chain removal-pay attention to the shape of the cam lobes of the no. 1 cylinder and slots in the ends of the camshafts. Disassemble the camshaft phaser and the sprockets that accompanies it with the help of an Allen wrench, and mark the parts that are to be reattached, with indelible ink. While holding the cam shaft in position, suspend the camshaft sprocket bolt just as much as necessary to allow loosening. Secondly there is need to, unsurprisingly, remove the Variable Camshaft Timing (VCT) solenoid fasteners and the front camshaft bearing cap bolts which lifts the cap off the two camshafts. Identify and indicate the bearing caps so that the right ones will be placed back in the correct position and with the correct orientation. Some of the camshaft bearing cap bolts may be extremely tight due to the pressure of the valve springs; as such, they can be removed progressively while loosening the tension of the springs, then remove the caps and take out the camshafts, noting that the exhaust camshaft has a reference lobe. It is important only to store each of the lifters in a clean container without swapping any of them. Look for worn out camshafts and lifters, check on the diameters of the lifters, and also look for signs of damages. If the engine contains loud noise at the valve components, setting the valve clearances could be called for. ScrollView the camshaft lobes and bearings for flatness and wear and measure the diameters of the journal. Measuring the bearing journal running clearance by Plastigage and if any clearance is beyond the service means, replace the camshaft or cylinder head. To get an indicator mark, clean those bearing surfaces and then to measure the camshaft endplay use a dial indicator. When installing ensure that the crankshaft is at the T DC; oil the lifter bores and the lifters and then place them back in their positions. Lubricate the camshaft bearing surfaces and then fit camshafts are to be in proper alignment. Remove all the dirt on the surfaces that are to be mated this is followed by application of RTV sealant on to the exhaust camshaft rear bearing cap. Place the camshaft bearing caps as indicated by the marked positions and then fasten them in the manner that was described above. Last, attach the variable camshaft timing solenoids, the phasers, the sprockets after which follows the reassembly of the timing chain, phaser and the re-timing of the valves, before fitting the valve cover the valve clearances should also be checked.

These engines are not easy to service and this quite often needs a number of tools. Since the timing chains must be treated delicately, any occurrence that entails their modification is complex and disassembling may cause severe damage to the engine. As an interference engine design, a faulty timing chain forces valve and potentially piston interference and requires removal of cylinder heads. The timing system is challenging and errors can be costly, involving major engine failure; due to the complexity of this repair, only skilled personnel should attempt this, and all work carried out should be cross checked before starting the engine. Some of the om4601 series turbocharged models with DI have very high fuel rail pressure, and fuel pressure release procedures must be observed before working on any high pressure fuel system. In the automobile industry, durability is now an important aspect that most car producers pay great attention to; all of the 3.5L and 3.7L Duratec engines feature solid tappets; in contrast, the 2.7L EcoBoost engines contain roller followers and hydraulic lash adjusters. Before performing the removal of the camshafts, what is needed is to lift the vehicle off the ground securely, release fuel pressure, and or remove the negative terminal of the battery. When pulling both camshafts from both sides, the side must be pulled right firstly and then left; and in any case timing chains and corresponding camshaft VCT units should be withdrawn gently. Front camshaft mega-cap has to be unmounted first to prevent the damage to the engine and all caps must be put in their respective place. Removal of the camshafts enables one to pull the lifters by the use of a magnet and these should be placed in another container which should preferably be marked for easy identification when assembling. Camshafts are also meant be cleaned, inspected for further wear or damage and then the bearing journals and camshaft lobe heights are to be measured. Lash adjusters shall be lubricated and fitted back to their starting positions and camshafts required to be correctly placed before the caps and bolts are tightened in pairs. The valve clearances are to be inspected and set and the subsequently the installation of VCT units and timing chains. At last the cooling system should be filled again and the oil should be changed before starting the engine.

Use an Allen head socket to loosen and remove the phaser bolt caps.

Turn the crankshaft 1-2/3 turns (clockwise) until the crankshaft keyway is at 11 o'clock.

The remainder of the reassembly procedure, including replacement of the timing chain and setting the valve timing.