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techtalk:ih:engmech03e [2017/12/20 02:50] hippysmack [Three angle valve seats - 1980 and up FLT/FL/FX/XL models] |
techtalk:ih:engmech03e [2018/01/21 15:16] (current) hippysmack [Three angle valve seats - FLT/FL/FX/XL models] |
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| [[:techtalk:menu|{{ :techtalk:gototechnicalmenu.jpg|}}]] | [[:techtalk:menu|{{ :techtalk:gototechnicalmenu.jpg|}}]] | ||
| ====== IH: Engine Mechanicals - Sub-03E ====== | ====== IH: Engine Mechanicals - Sub-03E ====== | ||
| - | ====== Three angle valve seats - 1980 and up FLT/FL/FX/XL models ====== | + | ====== Three angle valve seats - FLT/FL/FX/XL models ====== |
| - | * The MoCo issued a bulletin in June of 1980 stating that all 1981 production models incorporate three angle valve seats on the (intake and exhaust) ports on the heads. There are specific procedures that must be followed when cutting this type of valve seat. Always be sure to reface the valves before you cut the seats. A Neway Valve Seat Cutter (444-HDF) or other quality equipment is recommended for this. ((HD Service Bulletin #M-782 dated June 3, 1980)) | + | * The MoCo issued a bulletin in June of 1980 stating that all 1980 production models incorporate three angle valve seats on the (intake and exhaust) ports on the new -80 heads. ((HD Service Bulletin #M-782 dated June 3, 1980)) |
| + | * In April of 1981, this was reiterated for XL Models starting with crankcase (781012001) with the introduction of new heads for the 81 model year, ((HD Service Bulletin #M-827 dated April 24, 1981)) which were available as replacement for previous year models. | ||
| + | * There are specific procedures that must be followed when cutting this type of valve seat. Always be sure to reface the valves before you cut the seats. A Neway Valve Seat Cutter (444-HDF) or other quality equipment is recommended for this. | ||
| * Follow the procedures outlined in the service manual for removing and re-facing valves and guides and decarbonizing the combustion chamber. | * Follow the procedures outlined in the service manual for removing and re-facing valves and guides and decarbonizing the combustion chamber. | ||
| - Cut the 46° seat angle first. Cut only enough to clean up the seat. | - Cut the 46° seat angle first. Cut only enough to clean up the seat. | ||
