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techtalk:ih:engmech01b [2018/07/11 03:32] hippysmack ['76 and Earlier Cases] |
techtalk:ih:engmech01b [2019/06/15 16:22] hippysmack |
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| * Since the transmission shares the same fluid with the primary, and the primary plug is lower than the tranny drain plug, there is no reason to remove this one. | * Since the transmission shares the same fluid with the primary, and the primary plug is lower than the tranny drain plug, there is no reason to remove this one. | ||
| * **The plug to the right center of the photo is the (crankcase drain plug)**. This is the one everyone has problems with. ((Shadowdog500 of the XLFORUM http://xlforum.net/forums/showthread.php?t=806833&highlight=drilling+tapping+drain&page=2)) | * **The plug to the right center of the photo is the (crankcase drain plug)**. This is the one everyone has problems with. ((Shadowdog500 of the XLFORUM http://xlforum.net/forums/showthread.php?t=806833&highlight=drilling+tapping+drain&page=2)) | ||
| - | * This plug was never meant to be an actual case drain (in street engines). It's purpose has been somewhat of a debate. ((piniongear of the XLFORUM http://xlforum.net/forums/showthread.php?t=806833&highlight=drilling+tapping+drain)) See more below. | + | * (It has been said that ) this plug was never meant to be an actual case drain (in street engines). It's purpose has been somewhat of a debate. ((piniongear of the XLFORUM http://xlforum.net/forums/showthread.php?t=806833&highlight=drilling+tapping+drain)) See more below. |
| |{{:techtalk:ih:engmech:ih_drain_plugs_by_shadowdog500.jpg?direct&400|}}| | |{{:techtalk:ih:engmech:ih_drain_plugs_by_shadowdog500.jpg?direct&400|}}| | ||
| Line 20: | Line 20: | ||
| * ** Transmission Drain Plug**: 1/2"x13 | * ** Transmission Drain Plug**: 1/2"x13 | ||
| * **Crankcase Drain Plug**: 1/2"x13 ((sevenyears of famine of the XLFORUM http://xlforum.net/forums/showthread.php?t=1461031&highlight=stripped+primary+drain)) | * **Crankcase Drain Plug**: 1/2"x13 ((sevenyears of famine of the XLFORUM http://xlforum.net/forums/showthread.php?t=1461031&highlight=stripped+primary+drain)) | ||
| + | * The drain on the pre1977 [non-mini sump] engine is under the flywheels, and was intended as a case drain. ((Racepres of the XLFORUM http://xlforum.net/forums/showthread.php?t=1950691)) \\ The 57 and 59 parts catalogs do specify "crankcase drain plug" while all others just read "drain plug" in the crankcase sections. ((hippysmack)) | ||
| + | * We used either the pre'77 or we put one into '77-+ cases so that when racing, we could pull the plug in the pits to see how much oil was in the bottom end...helping to determine how much more restriction or bypass of feed oil we needed to eliminate, because the oil pump could not get rid of it. ((Racepres of the XLFORUM http://xlforum.net/forums/showthread.php?t=1950691)) | ||
| + | * If you are not requiring that knowledge, or don't intend to do anything about it anyway. | ||
| * According to one theory, the hole was needed for the casting and machining process only and the plug was never meant to be removed after it was installed at the factory. The MoCo couldn't provide information on exactly how the hole was used during the manufacturing process because AMF did not keep good records and also a lot of records were lost during the transition back from AMF. ((Shadowdog500 of the XLFORUM http://xlforum.net/forums/showthread.php?t=806833&highlight=drilling+tapping+drain&page=4)) | * According to one theory, the hole was needed for the casting and machining process only and the plug was never meant to be removed after it was installed at the factory. The MoCo couldn't provide information on exactly how the hole was used during the manufacturing process because AMF did not keep good records and also a lot of records were lost during the transition back from AMF. ((Shadowdog500 of the XLFORUM http://xlforum.net/forums/showthread.php?t=806833&highlight=drilling+tapping+drain&page=4)) | ||
| * Another theory is that people think the plug under the crankcase is a drain plug like you find on a car's oil pan and they remove it to drain excess oil collected in the case. ((piniongear of the XLFORUM http://xlforum.net/forums/showthread.php?t=806833&highlight=drilling+tapping+drain)) | * Another theory is that people think the plug under the crankcase is a drain plug like you find on a car's oil pan and they remove it to drain excess oil collected in the case. ((piniongear of the XLFORUM http://xlforum.net/forums/showthread.php?t=806833&highlight=drilling+tapping+drain)) | ||
| Line 58: | Line 61: | ||
| |{{:techtalk:ih:engmech:1968_drain_plug_crack_by_nakina.jpg?direct&300|}}| | |{{:techtalk:ih:engmech:1968_drain_plug_crack_by_nakina.jpg?direct&300|}}| | ||
| | Cracked case at the crankcase drain plug on a 1968 XLCH ((photo by nakina of the XLFORUM http://xlforum.net/forums/showthread.php?t=1974050&highlight=stripped+threads)) | | | Cracked case at the crankcase drain plug on a 1968 XLCH ((photo by nakina of the XLFORUM http://xlforum.net/forums/showthread.php?t=1974050&highlight=stripped+threads)) | | ||
| - | ===== '77 and Later Cases ===== | ||
| - | |{{:techtalk:ih:engmech:1977_case_drain_plug_1_by_bobbystat.jpg?direct&400|}}|{{:techtalk:ih:engmech:1977_case_drain_plug_2_by_bobbystat.jpg?direct&400|}}| | + | ===== L69-E71 cases ===== |
| - | | Case Drain Plug on a 1977 engine ((photos by bobbystat of the XLFORUM http://xlforum.net/forums/showthread.php?t=1950691)) || | + | |
| - | |{{:techtalk:ih:engmech:1978_drain_plugs_by_ironmick.jpg?direct&400|}}| | + | Late 1969, all 1970 and some early 71 cases came with no motor drains from the factory. ((Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1595420)) \\ |
| - | | Case & Tranny Drain Plugs on a 1978 engine ((photo by IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=806833&highlight=drilling+tapping+drain&page=2)) | | + | |
| + | |1969 XLCH with no sump drains. ((photo by ironheadjunkie of the XLFORUM http://xlforum.net/forums/showthread.php?t=1595420))| | ||
| + | |{{:techtalk:ih:engmech:69_xlch_2_by_ironheadjunkie.jpg?direct&300|}}| | ||
| + | |||
| + | ===== 77 and Later Cases ===== | ||
| + | |||
| + | | Case & Tranny Drain Plugs on a 1978 engine ((photo by IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=806833&highlight=drilling+tapping+drain&page=2)) | | ||
| + | |{{:techtalk:ih:engmech:1978_drain_plugs_by_ironmick.jpg?direct&300|}}| | ||
| + | |||
| + | | Case Drain Plug on a 1977 engine ((photos by bobbystat of the XLFORUM http://xlforum.net/forums/showthread.php?t=1950691)) ||| | ||
| + | |{{:techtalk:ih:engmech:1977_case_drain_plug_1_by_bobbystat.jpg?direct&300|}}|{{:techtalk:ih:engmech:1977_case_drain_plug_2_by_bobbystat.jpg?direct&300|}}|{{:techtalk:ih:oil:77_and_up_case_scavenging_by_bobbystat.jpg?direct&300|}}| | ||
