Chevrolet 22513937 VALVE

Valve resurfacing involves a sequence of activities that are different for various engine types. First, remove the cylinder head and place it on a clean, well-lit work surface. Eliminate valve seals from intake valve guides and discard them. Get rid of the valves and number them for reinstallation purposes. Make sure to cleanse all carbon deposits from combustion chambers, piston crowns and valves with a soft wire brush being careful not to rasp against valve seats or faces. Using the right spring compressor for valves, compress the valve spring until it springs off its cap keys. Free it in order to get rid of this cap. Cleaning carbon and gum deposits out of valve guide bores may be done using Reamer J-8101. The pits or damages on the valve faces as well as seat require attention therefore reface them at 45° angle if necessary. When there is excessive clearance with either 0.006 or 0.010 reamers ,ream out valve guides lightly lap valves into seats with fine grinding compound , ensuring smooth and true surfaces Test each one using Prussian blue coated on the face of each other to see who is more concentrically aligned Remove burrs from stem ends, polish stems with crocus cloth, lubricate stems and guides with clean engine oil before putting back Install new intake seals (no exhaust seal needed). Use an installer to locate these seals above guides correctly Install such springs so that tightly wound coil is located next to cylinder head (on 8-350 exhale ones you can install any end up) Pressurize springs then return caps afterwards assembling cylinder heads again Start by taking off rocker arm nuts balls arms use a compressor for removing keepers caps other relevant pieces when dealing Chevrolet engines For Pontiac motors remove rocker arms employing a compressor which removes locks caps among others in addition to this Restore Oldsmobile engines have remover key oil seals followed by their respective valves New oil seals are put over stems by means of an appropriate tool for the purpose Narrow valve seats to specified width and if necessary ream out guide bores for oversize valves when reconditioning the valves as well as valve seats This might be carbon deposits narrowing or widening a valve seat stem height and clearance etcetera assess wear, damage or any other problems from different parts. Valving conditions require scrutinizing for various components such as wear, damages, problems and others that may arise hence follow manufacturer's guidelines on servicing valves Measure correctly the height of each stem after proper placement of keys by tapping it down. Take all valves' measurements to ensure correct stem heights, replacing those ones that went too short.

The valve mechanism of the 231 cu in V6 engine is slightly unique relative to the other GM engines in the sense that it's an inherently valve lash adjuster. If the grinding is to be done on the valve seat on the cylinder head or the valve face then there will be change happen in the height of the stem of the valve above the head. According to GM, if the valve and seat have been refinished sufficient number of times to make the end of the valve stem about 0.050 in above its usual height, the stem should be ground to the standard height. Starting here involves the process of the removal of the cylinder head which should be placed on a clean surface. Valve spring can be compressed using the right spring compressor, you ought to then remove the valve spring cap key, and then release the tool to allow the removal of the spring and the cap. Remove the valve seals and unscrew the valves and having arranged them in numerical sequences set them with the seat faces downwards on a block of wood or cardboard. Scrub the cylinder head and inspect it for charring, pits, cracks and other signs of wear and tear; the valves may have to be re-sharpened or replaced as may be required. If re-grinding of a valve produces a sharp edge, the valve should be discarded since this causes overheating. Correct angle of the valve face is 45°. If the stem of a valve has more than free running clearance in it's guide it should be replaced with an oversized valve thus making it a job for a dealer or a machine shop. The valve seats should also be trued up to 45°, it is a small operation that will require the services of a dealer or a machine shop. When doing this, the valves are very lightly ground to the seats using course carborundum paste and suction cup grinding tool having to lift the value to provide an even spread of paste. After one has obtained an even surface with a dull matte finish, wipe the paste and do the same with fine carborundum paste to get a smooth ring of the grey matte finish. Remove any debris that may be present from the grinding compound and it is important to note that new valves should not be lap ground as this will compromises the surface plating. Finally thee valve stems and guides should be lubricated with engine oil before the valves are put back into their respective positions. Replace intake valve seals and do not replace exhaust valve guide seals. lightly place the valve seal over the valve stem and squeeze it down to the top of the guide and by using an installation tool you can place the seal on the valve guide until it takes the best fit. Tighten the springs only to a degree that allows fitting the keepers to be fitted without over compressing the valve seal. Last of all, replace the intake and exhaust valve springs which can be fitted in either direction of each other as well as the valve spring, the cap and the cap retainer.

After removing the valves, they should be arranged numerically for reinstallation.

Clean off the paste and repeat with fine carborundum paste until a smooth, even ring of grey matte finish is produced, then carefully clean away any grinding compound.