Chevrolet 1261380 Valve, Exhaust

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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.

Check the heads of the valves for pits, burns particularly on the exhaust valves and check the valve seating. If pitting is very minor it can be corrected by valve grinding the seats and the valves using coarse and fine valve grinding paste. To grind the valves, rub some carborundum paste of relatively large grain on the seat face and use suction grinder for the valve head using semi-rotary movement; once in a while, lift the valve head to let the paste spread evenly. When you get a smooth flat surface on the valve seat as well as on the valve face, remove the paste and wash it, then apply fine carborundum paste on the both surfaces and operate the valve lifting it up and turning as desired. For this purpose, it is possible to use a light spring under the valve head. When on both sides there is a continuous line of light grey matte finish the grinding process is said to be over. If there is deep pitting and burning - the valve must be refaced by the dealer and the seat recut; in case after refacing the head edge of the valve is worn down to the specified norms the valve must be changed. Free all carbon from both the valve head and stem and be certain that no grinding compound is in the ports or the valve guides. Scrub the valves and seats with a rag soaked in solvent, and then with a fresh clean rag; retire the valves and, if possible, use an air line to blow out any shooting from the valves, guides and ports.

Valve guide bores should be cleaned of carbon and gum deposits using Reamer J-8101.

If possible, use an air line to blow out the valves, valve guides, and valve ports.

After compressing the valve spring, remove the valve spring cap key, then release the tool and take out the spring and cap.

Carefully 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.

Once a dull matte finish is achieved on both surfaces, wipe off the paste and repeat the process with fine carborundum paste, ensuring to lift and turn the valve as needed.

The valve seats should be trued-up to 45°, another job suited for a dealer or machine shop.