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Reid- Sir, just do it! "Chasing" is simply running the proper size tap or die over an existing thread. Doing so is good practice and is essential to success in many repair jobs. Give the thread a shot of penetrant and let it soak a bit. In a blind hole, shove a small flat blade screwdriver to bottom and rotate it, to loosen up stuff packed in. Next, give it another shot of penetrant and carefully run THE PROPER TAP into the hole. Gently work the tap back and forth 'till you touch the actual bottom of the hole. Give it another shot of penetrant. The following can be dangerous, so work carefully. Put on your safety glasses! Put the tip of your air blow gun onto a hole made by one of the tap flutes. Cover the air gun, the tap, and the general area with a big heavy rag. An old hand towel is just right for this. Hold down the towel with one hand and give it blast of compressed air with the other. Work the tap back and forth, give it another shot of penetrant, and repeat the blow job. Do it several times, or 'till you're satisfied with the cleanliness of the thread. As you clean the holes, stuff a chunk of paper towel in 'em, to keep 'em clean while you are working. Pull the paper plugs when you are ready to bolt things together. On those good clean threads, use some anti-seize compound, or a film of gun grease. Use some "blue goo" silicone sealer instead in threaded holes that that open into the cooling system. Torque evenly, in 10-15 ft/lb steps, and per the shop manual diagram, to the low number in the specifications. Good luck! IHank
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