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techtalk:ref:tools050 [2022/03/21 23:25] hippysmack [Find the depth of the holes in the gearcase] |
techtalk:ref:tools050 [2022/03/22 00:55] hippysmack |
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| Below are suggestions for finding the lengths of unknown cam cover screws and where they go. \\ | Below are suggestions for finding the lengths of unknown cam cover screws and where they go. \\ | ||
| - | 1957-1985 parts catalogs contain the threads and lengths for the bolts but do not show where they go. \\ | + | Some parts books list the length screws/bolts HD sold for certain applications. \\ |
| + | 1957-1985 parts catalogs contain the threads and lengths for the cover mounting screws but do not show where they go. \\ | ||
| Screw thread size was taken out of the parts books in 1986 and was put back in the books in later years. \\ | Screw thread size was taken out of the parts books in 1986 and was put back in the books in later years. \\ | ||
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| - | All cam cover mounting bolts have 1/4"x20 threads with various quantities used (8, 9 or 11 screws depending on year model). \\ | ||
| - | The parts books list the length screws/bolts HD sold for certain applications. \\ | ||
| And historically, some lengths have either been misprinted (as in motor mount bolts) or changed at the parts dept. from time to time. \\ | And historically, some lengths have either been misprinted (as in motor mount bolts) or changed at the parts dept. from time to time. \\ | ||
| + | 1991-2003 parts books show where SOME of the bolts go but not all and 2004-up parts books do show where all the go. \\ | ||
| + | All cam cover mounting bolts have 1/4"x20 threads with various quantities used (8, 9 or 11 screws depending on year model). \\ | ||
| ====== Find Proper Screw Length by Uniformity ====== | ====== Find Proper Screw Length by Uniformity ====== | ||
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| * Cut at least three pieces of threaded rod about 3-1/2" long each (or cut the head off a long 1/4" screw/bolt). \\ Screw a couple in the gearcase as "holders" for the cover. \\ Install the cover gasket and cover over the rods and push lightly on the cover to take up any space to the gearcase. \\ Screw another threaded rod through a mounting hole in the cover by hand until it "lightly seats" in the bottom of the hole. \\ Mark the point where it peeks out of the cover with some tape. \\ Remove the rod, measure from your mark to the end of it and subtract 1/8". \\ That is the longest screw you want to put in THAT hole. \\ Repeat for all questionable holes. Buy/use screws that are in that range. \\ Screws/bolts are normalized in size so you may have to go shorter when buying them from stores. \\ If you can't find the right size screw(s), you can buy longer ones and cut them to the size needed. | * Cut at least three pieces of threaded rod about 3-1/2" long each (or cut the head off a long 1/4" screw/bolt). \\ Screw a couple in the gearcase as "holders" for the cover. \\ Install the cover gasket and cover over the rods and push lightly on the cover to take up any space to the gearcase. \\ Screw another threaded rod through a mounting hole in the cover by hand until it "lightly seats" in the bottom of the hole. \\ Mark the point where it peeks out of the cover with some tape. \\ Remove the rod, measure from your mark to the end of it and subtract 1/8". \\ That is the longest screw you want to put in THAT hole. \\ Repeat for all questionable holes. Buy/use screws that are in that range. \\ Screws/bolts are normalized in size so you may have to go shorter when buying them from stores. \\ If you can't find the right size screw(s), you can buy longer ones and cut them to the size needed. | ||
| + | The thread lengths of a 1980 XLH cam cover were found and recorded using this method ((dims by sickchops of the XLForum http://xlforum.net/forums/showthread.php?t=1731837)) \\ | ||
| + | Dims were transferred to the pic below. Click on the pic to enlarge: \\ | ||
| {{:techtalk:ih:engmech:1980_xlh_gearcase_cover_-_found_screw_sizes_by_wheatstateparts.jpg?direct&400|}} ((photo courtesy of Ebay seller, WheatStateParts. [[https://www.ebay.com/str/cos0608|Link to Ebay Store]] )) | {{:techtalk:ih:engmech:1980_xlh_gearcase_cover_-_found_screw_sizes_by_wheatstateparts.jpg?direct&400|}} ((photo courtesy of Ebay seller, WheatStateParts. [[https://www.ebay.com/str/cos0608|Link to Ebay Store]] )) | ||
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| ====== Find the depth of the holes in the gearcase ====== | ====== Find the depth of the holes in the gearcase ====== | ||
| With the cam cover off; \\ | With the cam cover off; \\ | ||
