Mercury E3ZZ-6507-A Valve - Inlet

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Valve displacement dictates the size by which the valves extend into the cylinder while the time for which the valve remains opened or closed is equally critical. In the case where valve clearance is set too high the following consequences are possible: increased wear of the camshaft and incomplete opening of the valve, the appearance of a tapping sound from the valve mechanism and unsatisfactory work of the engine due to limited gas exchange. Inadequate clearance, on the other hand, results to poor seating of the intake and exhaust valves leading to leakage of gases in the combustion chamber and consequent heating of the valves, and since there is little heat transfer, the valves might end up being warped. Its important that the adjustments be accurate but it is better for the valves to be slightly big rather than small to avoid burning. Since both 2.0L and 2.3L are gasoline engines, they have a hydraulic valve train that requires no periodic adjustments. Some general changes include; 2.2L and 2.3L diesel engines require the following; warm up the engine, take off the valve cover, check head bolts, for torque and then only adjust the selected valves at Top Dead Center. When adjusting the stacks, one removes the lock nuts, rotates the adjusting screw clock wise or anti-clock wise to hit the standard specified clearance and ensures the all the stacks are clean before they are re-fixed on the plates. On the 2.4L engine, it is done on cold engine that calls for disconnecting the battery, withdrawing the rocker arm cover, and adjusting the intake and exhaust valves to correct clearance using the feeler gauges. 2.9L usually does not need adjustments and when it does the process it entails positioning of your cams, removal of screws and very delicate adjustment until you get the right plunger position. Moreover, the above 4.0L engine incorporates a hydraulic roller valvetrain, which does not require adjustment after some times.

Make sure the lifters are compressed by installing new lifters or by compressing the lifters and relieving them of all internal oil pressure if they have been in service. A special tool is available for this procedure.

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.

It may be wise to check for internal coolant leaks, especially if the engine has overheated.

They 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 (if necessary), replace the valve seals, reassemble the valve components, ensure correct spring height and pressure, and resurface the cylinder head gasket surface if necessary.

A valve job is typically more conveniently and affordably carried out by an automotive machine shop.

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.

The home mechanic can remove and disassemble the head, do 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. Doing the inspection will enable the mechanic to see what condition the head and valve train components are in and will ensure that they know what work and new parts are required when dealing with an automotive machine shop.

Because of the complex nature of the job and the special tools and equipment needed, servicing of the valves, valve seats, and valve guides, commonly known as a valve job, is best left to a professional.

Normally, these engines do not need any valve adjustments because the lash is accounted for by the hydraulic lifter.

After the valve job has been performed by a professional, the head will be in like-new condition. When the head is returned, be sure 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. Use compressed air, if available, to blow out all the oil holes and passages.