GM 14031332 Valve, Exhaust

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Because of the challenge involved and the kind of equipment needed to work on the valves, the valve seats, and the valve guides it is advisable to engage the services of a professional. Home mechanic can take off and unbolt the head, perform rudimentary thorough washing and examination of the head and then he/she can present it to a dealer service department, or to a professional automotive machine shop for the actual valve servicing. The service department or the machine shop will have to have to strip the valves and springs, recondition or replace according to the need, inspect and replace the valve springs as contained in the specification, also replace the retainers, rotators and keepers if need be, replace the valve seals, reassemble the part and finally correctly set the installed spring height. Further, Cylinder head gasket surface will be grind as well if it is warped. That is always the case after performing the valve job, and the head will be almost as good as new. It should be washed before being placed in the head on the engine so as to purge it of any metal chips and sand that may be left behind during the service or after resurfacing. Compressed air should be utilised, if available, to blow out all oil holes and passages.

The grinding is complete when a smooth, unbroken light grey matte finish is obtained.

If significant pitting or burning is present, the valve should be refaced by a dealer and the seat recut. If refacing reduces the valve head edge to below specifications, the valve must be replaced.

Install new intake valve seals, avoiding exhaust valve guide seals. Start the valve seal over the valve stem, pushing it down until it touches the top of the guide, and use an installation tool to push the seal over the valve guide until it fits snugly.

The service department or 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, and ensure the installed spring height is correct. Additionally, they will resurface the cylinder head gasket surface if warped.