Mercury E8ZZ-6507-A Valve - Inlet

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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 shop. The home mechanic can remove and disassemble the head, perform the initial cleaning and inspection, 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 or rotators, and keepers as necessary, 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 it is warped. After the valve job has been performed by a shop, 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.

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.

As seen, because of the nature of the job and the tools that needs to be used, the process of working on the valve, valve seats and the valve guides that is often referred to as valve job, should only be done by a professional. With the head removed and dismantled, a home mechanic is in a position to provide initial washing and inspection of the part before reassembling it for delivering to a dealer service department or an automotive machine shop for the actual work to be done on the head. Carrying out the inspection makes it possible to get an understanding of the state of head and valve train parts thus; knowing the work required and new parts when dealing with an automotive machine shops. For the specific services described below, responsibility will lie with the dealer service department or automotive machine shop: valve removal, valve or spring reconditioning or replacement, checking and replacing valve guides, valve spring, spring retainer, rotator or keepers as necessary, replacing valve seals, reassembling valves, and verifying the accuracy of the installed spring height, among others. Also, if the surface of the cylinder head gasket is uneven, this will also be machined. After the valve job is done the head will be smooth as new, after this another washing may be done to remove the remaining metal particles and abrasive grit that may be remaining following the head machining or the valve service. It is also blown through all oil holes and passages using compressed air.

Because of the nature of the position and the specific instruments and equipment needed, performing the valve job as it takes to service the valves, valve seats, and valve guides should be handled by an expert. An amateur can unbolt the head, open it to inspection and semi-cleaning before delivering the assembly to a dealership or an automotive machine where the actual work will be done. It makes it possible to determine the state of components of heads and valve trains, know what work is still required, what new parts may be needed when cooperating with an automotive machine shop. The dealer service department or automotive machine shop is retained for the relief of valves and springs, valve face necessary reconditioning or new, reconditioning of valve guides, checking and replacing of valve springs, spring retainers, rotators and keepers if necessary, valve seal replacement, assembly of valve components, and correct installed spring height check also. Also, if its surface has warping, the cylinder head gasket surface will be resurfaced. After the valve job is done by a professional the head will be almost as new as it was when it first came out the factory. On its arrival, the head must also be washed to reduce the amount of metal particles and abrasive grit that might still be present after serving the valves or resurfacing, and compressed air if available should be used to blow out all the oil holes and passages before fitting on the engine.

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 shop. The home mechanic can remove and disassemble the head, perform the initial cleaning and inspection, 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 or rotators, and keepers as necessary, 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 it is warped. After the valve job has been performed by a shop, 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.

No, there are no manufacturer recommended service intervals for checking valve clearances on this engine at the time this manual was written. High mileage or excessive noise in the valve train may determine the need to check the valve clearances.

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 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.

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.

The head should be cleaned again 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.