Nissan 13201-V5202 Valve-Intake

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Given the fact that this is a highly professionalized position, and it entails the use of some special tools and apparatus, the procedure known as a valve job, which refers to the servicing of the valves, valve seats, and valve guides should only be done by a master mechanic. A home mechanic should detach the heads and undertake preliminary scrubbing and checking before taking them to a dealer's service station or automotive machine for servicing. Carrying out the inspection enables the checker to get an insight on the state of the cylinder head and the valvetrain components, know the work that needs to be done, and the new components to be expected from an automotive machine shop. The Power train or the dealer service department or automotive machine shop will then remove valves and springs, recondition or replace valves, or valve seats, recondition or replace valve guides, check and replace valve springs, spring retainers or valve stem locks and replace the valve seal with a new one, assemble the valve components, and verify the correct installed height of the spring. Further, the surface of cylinder head gasket will be ground if warped is the case. After the valve job which is done by a professional the cylinder head will be as good as new. On the return, it is necessary to wash again the cylinder head before putting it on the engine in order to remove metal debris and abrasive grit remained either after the valve service or cylinder head resurfacing, and to blow through all oil holes and ducts, if possible with compressed air.

Because of the aggravating circumstances and due to the fact that specialized tools and equipments are needed to perform the task, the procedure known as valve job which involves servicing the valves, valve seats, and valve guides is better performed by an automotive machine shop. An individual working at home can take out the head, provide preliminary washing, and inspection, then take the head to a dealer service department or automotive machine shop for actual valve work. Perhaps, the shop will rebuild or replace the valves and valve seats, do the valve guides' reconditioning, check and replace the valve springs and their retainers and keepers as needed, replace valve guide seals, assemble the valves, and adjust the installed spring height. Also, if warped, the cylinder head gasket surface shall be refinished to flatness before the gasket is installed. After that, the head should be clean once more to remove any final traces of metal particles and abrasive grits issuing from the valve service and head resurfacing functions; one must employ compressed air if possible to blow out all the oil holes and passages.

A home mechanic can undertake the removal and disassembly of the heads, perform initial cleaning and inspection, and then reassemble and deliver them to an automotive machine shop for the actual service work.

The procedure requires special valve lifter tools, which can be obtained from specialty tool manufacturers and some auto parts stores.

After the valve job has been performed, the cylinder head will be in like-new condition. Before installation on the engine, it is important to clean the cylinder head again to remove any metal particles and abrasive grit that may still be present from the valve service or cylinder head resurfacing operations. Using compressed air, if available, is recommended to blow out all the oil holes and passages.