Like the Tractor Vet has posted, the problem is limited to the 460/560 and newer engines of that type. The burned exhaust valve problem is caused by deposits on the valve stems. Oil coming down the guides gets cooked on the lower part of the stem. As long as the engine remains under a fairly steady load there will be no problems. If the valve stem temperatures stay somewhat constant the motion on the stem in the guide will be enough to keep the deposits from building up to a point where they cause the valve to stick open. The problem occurs when the engine is placed under a greater load and the stem temperature go up and cause the stem to expand. When that happens the valve starts to get tight and if it sticks open it will allow the hot combustion gases to leak past the face and seat. The resulting leakage acts just like a cutting torch and that is just what the burned valve looks like.
To correct this problem IH engineers changed the valve stem seals to cut down on the amount of oil going down the valve stems. They also changed the valves to a Stelite faced type to present a harder surface. Both of those actions helped but did not eliminate the problem. In fact sometimes you will see a valve where the valve face is still intact but the valve is burned out under neath the Stelite facing.
This problem was discussed at on of the IH training classes I attended. We were told that once IH developed their No 1 diesel oil the problems got much worse for the gas engines since they were trying to have just one oil for all their engines. When doing testing on the gas engines they were having valve problems show up in as little as 100 - 300 hours on new engines. Once they switched to Low Ash (0.50% ash content) they engines were able to pass 1000 hours without valve problems.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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