Mercury F4TZ-6507-AB Valve - Inlet

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The V8 engine has valve arrangement, left bank E-I-E-I-E-I-E-I and right bank I-E-I-E-I-E-I-E; the inline six-cylinder engine has the following valve arrangement, E-I-E-I-E-I-E-I-E-I-E. For V6 engines the cylinder arrangement is right bank I-E-I-E-I-E and left bank E-I-E-I-E-I. These engines, as a rule, do not have valve adjustments because hydraulic lifters cover lash, but if signs of excessive valve clearance appear, including loud noises from the lifter, a defective part should be checked. Engines generally do not require a valve adjustment and only call for one when a valve component fails e.g. hydraulic lifter problems, or when excessive wear is witnessed on the rocker arm. Any major work on the engine that modifies the relationships of the valve train components require adjustment of the dimensional differences and that is possible with shorter or longer pushrods. To find out the length of pushrod, join an auxiliary starter switch with the starter solenoid or manually turn the crankshaft. Place the piston in the number one cylinder at top dead centre on the compression stroke and then scribe the crankshaft at 0-degrees TDC. For V6 and V8 engines additional marks should be made at 180-degree and ninety degrees from the timing mark, for inline six clerks five space marks should be made at one hundred-twenty degree either side of the zero-timing mark. After the valve cover(s) has been removed, lifters should be compressed, that is achieved by fitting new lifters or by relieving existing lifters of internal oil pressure. When the number 1 piston is at Top Dead Center(TDC) use a lifter compressor tool on the number 1 intake rocker arm to pump down the lifter and then measure the rocker arm clearance to the valve stem tip by feeler gauge. If the clearance is higher than the specified one, the pushrod should be replaced by a longer one; if it is lower-by a shorter one. The same should be done to the number one exhaust valve. For inline six-cylinder engines, rotate the crankshaft in one-third revolution at a time and all intake and exhaust valves are to be adjusted in fire order sequence of 5-3-6-2-4-1. In cases of V6 engines, after inspecting the number one cylinder valves, inspect the number 3 intake and number 2 exhaust, then move to number 6 intake and number 4 exhaust all this without turning the crankshaft. Then turn the crankshaft by 360-degrees and inspect the valves according to the stated sequence. For 255 and 302 (5.0L) VB engines, after inspecting number one cylinder valves, examine the following other valves while turning the engine to Positions 2 and 3 as marked. The same applies to the 351 (5.8L) and 400 VB applications. For example if the number one cylinder valves on the 460 (7.5L) VB engine look good look at the other cylinder valves rotate the crankshaft further to Position 2 for further examination. Finally, the other engine parts should be re-fitted and running of the engine should be made, several minutes must be allowed after running of the engine, particularly if new lifters were use to take up the clearance. If other parts of the vehicle are all right but there is an imbalance on the valve lash problems, the lifter should be compressed with the special service tool and check the valve clearance.

Due to the intricate nature of the task and the high cost of the necessary special tools and equipment, servicing of the valves, valve seats, and valve guides, often referred to as a valve job, is typically more conveniently and affordably carried out by an automotive machine shop. A home mechanic can remove and disassemble the head, perform the initial cleaning and inspection, then reassemble and deliver it to a dealer service department or an automotive machine shop for the actual service work. This inspection allows the mechanic to assess the condition of the head and valve train components and to understand what work and new parts are needed when interacting with an automotive machine shop. The dealer service department or automotive machine shop will then remove the valves and springs, recondition or replace the valves and valve seats, recondition the valve guides, check and replace the valve springs, spring retainers or rotators and keepers (if necessary), replace the valve seals with new ones, reassemble the valve components and ensure the installed spring height, and pressure, is correct. The cylinder head gasket surface will also be resurfaced if it's warped, if not beyond service limits. It may be wise to have the cylinder head pressure checked for internal coolant leaks, particularly if the engine has overheated. After the valve job, the head will be in a condition similar to new. When the head is returned, it should be cleaned again before installation on the engine to remove any remaining metal particles and abrasive grit from the valve service or head resurfacing operations. Compressed air can be used to blow out all the oil holes and passages.

Because of the complex nature of the job and the special tools and equipment needed, servicing the valves, valve seats, and valve guides, commonly known as a valve job, is best left to a professional. The home mechanic can remove and disassemble the head, perform initial cleaning and inspection, and then reassemble and deliver the head to a dealer service department or an automotive machine shop for the actual valve servicing. The dealer service department or automotive machine shop will remove the valves and springs, recondition or replace the valves and valve seats, recondition the valve guides, check and replace the valve springs, spring retainers, and keepers as required, replace the valve seals with new ones, reassemble the valve components, and ensure the installed spring height is correct. The cylinder head gasket surface will also be resurfaced if warped. After the valve job has been performed by a professional, the head will be in like-new condition. When the head is returned, it is important to clean it again before installation on the engine to remove any metal particles and abrasive grit that may still be present from the valve service or head resurfacing operations, using compressed air if available to blow out all the oil holes and passages.

The dealer service department or automotive machine shop will: Remove the valves and springs Recondition or replace the valves and valve seats Recondition the valve guides Check and replace the valve springs, spring retainers, and keepers as required Replace the valve seals with new ones Reassemble the valve components Ensure the installed spring height is correct Resurface the cylinder head gasket surface if it's warped.

After checking the clearances on both number one cylinder valves, check number 3 intake and number 2 exhaust, then number 6 intake and number 4 exhaust without rotating the crankshaft. Rotate the crankshaft 360-degrees and check, in order, number 2 intake and number 3 exhaust, number 4 intake and number 5 exhaust, and number 5 intake and number 6 exhaust.

The dealer service department or automotive machine shop will: Remove the valves and springs Recondition or replace the valves and valve seats Recondition the valve guides Check and replace the valve springs, spring retainers or rotators, and keepers (as necessary) Replace the valve seals with new ones Reassemble the valve components Ensure the installed spring height is correct Resurface the cylinder head gasket surface if it's warped.