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techtalk:ref:engmech01n [2022/03/14 21:34] hippysmack [1952-1976 K and Sportsters] |
techtalk:ref:engmech01n [2022/03/14 22:36] (current) hippysmack [History] |
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| ====== REF: Engine Mechanicals - Sub-01N ====== | ====== REF: Engine Mechanicals - Sub-01N ====== | ||
| ====== Cam Cover Gasket Compatibility ====== | ====== Cam Cover Gasket Compatibility ====== | ||
| - | ====== Ironhead Cam Cover Gaskets ====== | + | \\ |
| - | ===== 1952-1976 K and Sportsters ===== | + | ====== 1957-1985 Cam Cover Gaskets ====== |
| - | ==== History ==== | + | ===== History ===== |
| + | **Gaskets**: \\ | ||
| **1952-1976 models** originally used OEM gasket 25224-52 until 1977 when the 25224-52A came out and replaced the -52 gasket back to 1952. \\ | **1952-1976 models** originally used OEM gasket 25224-52 until 1977 when the 25224-52A came out and replaced the -52 gasket back to 1952. \\ | ||
| The -52 gasket has 2 holes in the top center (one for a mounting screw, the other for an oil passage from cover to upper feed galley in the case) \\ | The -52 gasket has 2 holes in the top center (one for a mounting screw, the other for an oil passage from cover to upper feed galley in the case) \\ | ||
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| So the original hole location was preserved which allows the revised gasket to be used on previous models. \\ | So the original hole location was preserved which allows the revised gasket to be used on previous models. \\ | ||
| - | ==== Gearcase Upper Oil Feed Galley ==== | + | **Gearcase Upper Oil Feed Galley**: \\ |
| * 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. | ||
| * L1979 Upper Gearcase Casting Change: \\ 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 also changed to match up to the newer profile. \\ The cover gasket (25224-52A) was modified to fit the revised castings and help eliminate possible leaks on earlier crankcases. | * L1979 Upper Gearcase Casting Change: \\ 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 also changed to match up to the newer profile. \\ The cover gasket (25224-52A) was modified to fit the revised castings and help eliminate possible leaks on earlier crankcases. | ||
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| | 1957-E1982 (and some L1981) models \\ use cam cover gasket (25224-52A) ((photo courtesy of Ebay seller, inlinefabrication. [[https://www.ebay.com/str/inlinefabrication|Link to Ebay Store]] )) | 1982-1985 (and some L1981) models \\ use cam cover gasket (25263-81) ((photo courtesy of c3cycle.com, Link to site: https://www.c3cycle.com/)) | | | 1957-E1982 (and some L1981) models \\ use cam cover gasket (25224-52A) ((photo courtesy of Ebay seller, inlinefabrication. [[https://www.ebay.com/str/inlinefabrication|Link to Ebay Store]] )) | 1982-1985 (and some L1981) models \\ use cam cover gasket (25263-81) ((photo courtesy of c3cycle.com, Link to site: https://www.c3cycle.com/)) | | ||
| |{{:techtalk:ih:engmech:1972_xlch_gearcase_oil_galley_by_inlinefabrication.jpg?direct&300|}}|{{:techtalk:ih:engmech:1984l_xls_gearcase_oil_galley_by_c3-cycle-tech.jpg?direct&300|}}| | |{{:techtalk:ih:engmech:1972_xlch_gearcase_oil_galley_by_inlinefabrication.jpg?direct&300|}}|{{:techtalk:ih:engmech:1984l_xls_gearcase_oil_galley_by_c3-cycle-tech.jpg?direct&300|}}| | ||
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| + | ===== Gaskets ===== | ||
| + | **Note**: \\ | ||
| + | Make sure before using a NOS -52A gasket (on L1979-1981) engines that it has the long slanted slot. \\ | ||
| + | |||
| + | * 1957-E1982 right cases with the small boss and __oil slot__ use gasket (25224-52A). \\ 57-E79 models can still use gasket 25224-52 with the hole in the upper center and these can be found online. \\ L79-81 models must use the 25224-52A gasket with the long slanted slot. | ||
| + | * L1981-1985 right cases with the large boss and __horizontal oil hole__ use gasket (25263-81). \\ These models must use gasket 25263-81 with the long horizontal slot. | ||
