Ford 5L1Z-6505-B Exhaust Valve

Because of the work challenge and given the fact that the work requires the use of specialized tools and equipment, it is recommended that the main work of cutting and grinding of the valves, the seats and the guides as they are widely referred to as the 'valve job', should best be done by a professional. It is easier for a home mechanic to pull the head, preliminary wash and examine the head and then take the head to a dealer service department or an automotive machine shop for the real service to be done on it. Performing the inspection enables identification of the state of the head and valve train parts and be aware of required work and new parts when interacting with an automotive machine shop. The dealer service department or the automotive machine shop will perform the valve and spring removal, valve and valve seat reconditioning or replacement, valve guide reconditioning, valve spring, spring retainer, rotator and keeper inspection and replacement when necessary, valve seal replacement, reconstruction of valves and valve components, and determination of the installed spring height. Also the surface of the cylinder head gasket will be ground if it is warped. After the valve job is done by a professional the head turn out to be like new with no or with negligible wear possible. After removal, it must be cleaned for the second time and, before being put in place on the engine, a thorough removal of any metal chips and other abrasive particles resulting from the valve work or the honing of the head must be accomplished with the aid of compressed air to clear all the oil ways and holes.

The engine must be cold as the checking of the valve clearances should be done only in case where camshaft or other parts related to the valve have been changed or replaced or where excessive noise is heard coming from the valve train area. Loosen the connection of the cable from the negative terminal of the battery, next remove the spark plugs and the valve covers. Loosening the crankshaft pulley centre bolt one can use a socket and a breaker bar to rotate the engine until the camshaft lobes of the cylinder to be checked are positioned away from the tappets. With the feeler gauge, ascertain valve clearance for the valves which have been indicated and ensure they jot down all the readings taken; then compare the observed readings with the standard valve clearance in order to point out those valve clearances which are beyond the standard. Do the same process to all valves to obtain its initial measurement. If any clearance is out of specification, one has to replace the tappet with one of another thickness to correct it and, of course, the camshafts have to be removed in order to be able to deal with the tappets. Sticker the lifters for replacement and the valves that should go together with them using a micrometer to measure the thickness of the head of each lifter to the nearest 0.001 inches. If you'd like to know how thick the new lifter should be so as to achieve the desired valve clearance, then the formula N equal R + (M1-M2) should do it for you, where N is the thickness of the new tappet, R is the thickness of the old tappet, M1 is your measured valve clearance and M2 is the standard valve clearance. Coated lifters are coded on the bottom aspect to express their measurement where a marking of 3.310 denoted thickness of 3.31 mm or 0.13 inch. At last, select the new lifters that should be placed in the specific location, while apply the engine assembly lube on it, and place it into its correct position; replace the camshafts and timing chains back, and check it with the valve clearance.

Because of the work challenge and given the fact that the work requires the use of specialized tools and equipment, it is recommended that the main work of cutting and grinding of the valves, the seats and the guides as they are widely referred to as the 'valve job', should best be done by a professional. It is easier for a home mechanic to pull the head, preliminary wash and examine the head and then take the head to a dealer service department or an automotive machine shop for the real service to be done on it. Performing the inspection enables identification of the state of the head and valve train parts and be aware of required work and new parts when interacting with an automotive machine shop. The dealer service department or the automotive machine shop will perform the valve and spring removal, valve and valve seat reconditioning or replacement, valve guide reconditioning, valve spring, spring retainer, rotator and keeper inspection and replacement when necessary, valve seal replacement, reconstruction of valves and valve components, and determination of the installed spring height. Also the surface of the cylinder head gasket will be ground if it is warped. After the valve job is done by a professional the head turn out to be like new with no or with negligible wear possible. After removal, it must be cleaned for the second time and, before being put in place on the engine, a thorough removal of any metal chips and other abrasive particles resulting from the valve work or the honing of the head must be accomplished with the aid of compressed air to clear all the oil ways and holes.