Differences
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techtalk:ih:engmech01c [2023/12/19 23:50] hippysmack [Rear mounts] |
techtalk:ih:engmech01c [2023/12/19 23:52] (current) hippysmack [Upper Oil Feed Galley] |
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| * 1957-1981 and some E1982 cases have an elongated angled front to back slot for the oil feed galley in the top of the gearcase. \\ A hole is then drilled thru the left end of the slot to feed each rocker box oil line. \\ The casting above the oil slot is taller in that area especially on 77-E79 motors. \\ Cam Cover gasket was modified (25224-52A) to help control leaks by adding a slot to the oil feed hole. | * 1957-1981 and some E1982 cases have an elongated angled front to back slot for the oil feed galley in the top of the gearcase. \\ A hole is then drilled thru the left end of the slot to feed each rocker box oil line. \\ The casting above the oil slot is taller in that area especially on 77-E79 motors. \\ Cam Cover gasket was modified (25224-52A) to help control leaks by adding a slot to the oil feed hole. | ||
| - | * Slot construction (for those with the slot): ((Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1535474&page=5)) \\ On 1957-1963 models, the slot is plunge cut with and end mill. \\ On 1964-up models, the slot is cast into the case. | + | * Slot construction (for those with the slot): ((Dr Dick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/141725-early-sportster-engine-identification-1969-earlier/page5?t=1535474&page=5)) \\ On 1957-1963 models, the slot is plunge cut with and end mill. \\ On 1964-up models, the slot is cast into the case. |
| * M1980 Upper Gearcase Casting Change: \\ In November of 1979, the MoCo realized a possibile high pressure oil leak around the upper oil seam between the cam cover and the gearcase. ((TSB M-778 dated May 13,1980)) \\ The case casting was reworked and modified to eliminate this possibility. \\ The upper feed galley (slot) profile was changed. The top boss on the gearcase was shaved back. \\ The cover gasket (25224-52A) was modified to fit the revised castings and help eliminate possible leaks on earlier crankcases. | * M1980 Upper Gearcase Casting Change: \\ In November of 1979, the MoCo realized a possibile high pressure oil leak around the upper oil seam between the cam cover and the gearcase. ((TSB M-778 dated May 13,1980)) \\ The case casting was reworked and modified to eliminate this possibility. \\ The upper feed galley (slot) profile was changed. The top boss on the gearcase was shaved back. \\ The cover gasket (25224-52A) was modified to fit the revised castings and help eliminate possible leaks on earlier crankcases. | ||
| * 1982-1985 and some L1981 cases do not have an upper feed oil slot. \\ The slot was deleted and the large boss is cast around the feed galley area. \\ Oil is fed to the rocker box lines simply by way of a hole drilled thru the large boss in the upper gearcase. | * 1982-1985 and some L1981 cases do not have an upper feed oil slot. \\ The slot was deleted and the large boss is cast around the feed galley area. \\ Oil is fed to the rocker box lines simply by way of a hole drilled thru the large boss in the upper gearcase. | ||
