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techtalk:evo:engmech07 [2019/08/12 03:26] hippysmack [2004-Present] |
techtalk:evo:engmech07 [2019/11/03 04:36] hippysmack [Check the breather to gasket seal] |
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| {{:techtalk:evo:engmech:91_and_up_cc_pressure_drawing_by_hippysmack.jpg?direct&300|}} ((drawing by Hippysmack)) {{:techtalk:evo:engmech:91-up_engine_crankcase_breathing_by_hippysmack.jpg?direct&300|}} ((drawing by Hippysmack)) | {{:techtalk:evo:engmech:91_and_up_cc_pressure_drawing_by_hippysmack.jpg?direct&300|}} ((drawing by Hippysmack)) {{:techtalk:evo:engmech:91-up_engine_crankcase_breathing_by_hippysmack.jpg?direct&300|}} ((drawing by Hippysmack)) | ||
| - | ====== Late 1984-1990 ====== | + | ====== Late 1984-1990 Engine Breathing ====== |
| * 86-90 engines continued the breather baffle tube system from previous year models incorporated into the cam cover in the area behind the 86 style oil filter. | * 86-90 engines continued the breather baffle tube system from previous year models incorporated into the cam cover in the area behind the 86 style oil filter. | ||
| Line 76: | Line 76: | ||
| The 5 speed ones do not fit. | The 5 speed ones do not fit. | ||
| - | ====== 1991-2003 ====== | + | ====== 1991-2003 Engine Breathing ====== |
| * In 1991, along with the 5-speed transmission, the MoCo moved the crankcase breathing from the cam box cover outlet to breather bolts in the heads. \\ Previously, these bolts were just used to mount the carb and air cleaner to the heads. | * In 1991, along with the 5-speed transmission, the MoCo moved the crankcase breathing from the cam box cover outlet to breather bolts in the heads. \\ Previously, these bolts were just used to mount the carb and air cleaner to the heads. | ||
| * The new breather system uses one-way umbrella valves (AKA Foo Foo Valves) in the rocker boxes. \\ These exit crankcase vapors through vents in the top of the cylinder head into the carb mouth to be burnt. ((FoxsterUK of the XLFORUM http://xlforum.net/forums/showthread.php?t=518948&highlight=wet+sumping)) | * The new breather system uses one-way umbrella valves (AKA Foo Foo Valves) in the rocker boxes. \\ These exit crankcase vapors through vents in the top of the cylinder head into the carb mouth to be burnt. ((FoxsterUK of the XLFORUM http://xlforum.net/forums/showthread.php?t=518948&highlight=wet+sumping)) | ||
| Line 106: | Line 106: | ||
| | 91-03 crankcase ventilation is done through the hole with the wire tie. ((photos by Hippysmack)) ||| | | 91-03 crankcase ventilation is done through the hole with the wire tie. ((photos by Hippysmack)) ||| | ||
| - | ====== 2004-Present ====== | + | |
| + | ====== 2004-Present Engine Breathing ====== | ||
| * In 2004 the MoCo made some changes to the umbrella valve configuration. \\ The umbrella was retained but now inside a plastic housing with a pre-umbrella oil separating screen. \\ Each 'breather valve' is assembled into a plastic fitting that is sealed over the outlet hole in the lower rocker box to the head breather bolt. \\ The new breather valves were also accompanied with new style hollow air cleaner mounting bolts for the pressure to escape. | * In 2004 the MoCo made some changes to the umbrella valve configuration. \\ The umbrella was retained but now inside a plastic housing with a pre-umbrella oil separating screen. \\ Each 'breather valve' is assembled into a plastic fitting that is sealed over the outlet hole in the lower rocker box to the head breather bolt. \\ The new breather valves were also accompanied with new style hollow air cleaner mounting bolts for the pressure to escape. | ||
| * The new bolts are the same thread size as previous. \\ But instead of a simple hex, it also has a shoulder past the hex for an O-ring to be fitted between the hex head and the air cleaner. | * The new bolts are the same thread size as previous. \\ But instead of a simple hex, it also has a shoulder past the hex for an O-ring to be fitted between the hex head and the air cleaner. | ||
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| |{{:techtalk:evo:oil:breather_valves_by_dk_custom.jpg?direct&300|}}|{{:techtalk:evo:engmech:04_up_breather_1_by_bored_now.jpg?direct&300|}}|{{:techtalk:evo:engmech:04_up_breather_2_by_bored_now.jpg?direct&300|}}| | |{{:techtalk:evo:oil:breather_valves_by_dk_custom.jpg?direct&300|}}|{{:techtalk:evo:engmech:04_up_breather_1_by_bored_now.jpg?direct&300|}}|{{:techtalk:evo:engmech:04_up_breather_2_by_bored_now.jpg?direct&300|}}| | ||
| - | | Breather Valves Installed ((photo by chris_b_owens of the XLFORUM http://xlforum.net/forums/showthread.php?t=1832762&page=47)) | 2006 Breather Valves ((photos by JackAttack of the XLFORUM http://xlforum.net/forums/showthread.php?p=4435889)) || | + | | Oil drain hole. ((photo by dieselvette of the XLFORUM http://xlforum.net/forums/showthread.php?t=2073932&page=30)) | 2006 Breather Valves ((photos by JackAttack of the XLFORUM http://xlforum.net/forums/showthread.php?p=4435889)) || |
| - | |{{:techtalk:evo:oil:2013_crankcase_breather_4_by_chris_b_owens.jpg?direct&300|}}|{{:techtalk:evo:oil:06_rocker_box_removal_9_by_jackattack.jpg?direct&300|}}|{{:techtalk:evo:oil:06_rocker_box_removal_8_by_jackattack.jpg?direct&300|}}| | + | |{{:techtalk:ref:engmech:04_up_breather_valve_2_by_dieselvette.jpg?direct&300|}}|{{:techtalk:evo:oil:06_rocker_box_removal_9_by_jackattack.jpg?direct&300|}}|{{:techtalk:evo:oil:06_rocker_box_removal_8_by_jackattack.jpg?direct&300|}}| |
| + | |||
| + | | 2013 Breather Valves ((photos by chris_b_owens of the XLFORUM http://xlforum.net/forums/showthread.php?t=1832762&page=47)) ||| | ||
| + | |{{:techtalk:evo:oil:2013_crankcase_breather_2_by_chris_b_owens.jpg?direct&300|}}|{{:techtalk:evo:oil:2013_crankcase_breather_1_by_chris_b_owens.jpg?direct&300|}}|{{:techtalk:evo:oil:2013_crankcase_breather_4_by_chris_b_owens.jpg?direct&300|}}| | ||
| - | | 2013 Breather Valves ((photos by chris_b_owens of the XLFORUM http://xlforum.net/forums/showthread.php?t=1832762&page=47)) || | ||
| - | |{{:techtalk:evo:oil:2013_crankcase_breather_2_by_chris_b_owens.jpg?direct&300|}}|{{:techtalk:evo:oil:2013_crankcase_breather_1_by_chris_b_owens.jpg?direct&300|}}| | ||
| - | == Make sure the seal is tight == | + | ===== Check the breather to gasket seal ===== |
| There is an anomaly when it comes to the seal around the stock breather port under the rocker box. ((dieselvette of the XLFORUM http://xlforum.net/forums/showthread.php?p=5769573#post5769573))\\ | There is an anomaly when it comes to the seal around the stock breather port under the rocker box. ((dieselvette of the XLFORUM http://xlforum.net/forums/showthread.php?p=5769573#post5769573))\\ | ||
| The rocker box cover gasket is part of the seal for the breather port. \\ | The rocker box cover gasket is part of the seal for the breather port. \\ | ||
| Line 154: | Line 157: | ||
| Also there is a bump to take up extra space next to the umbrella housing and it fits nicely in the hole of the gasket. \\ | Also there is a bump to take up extra space next to the umbrella housing and it fits nicely in the hole of the gasket. \\ | ||
| - | {{:techtalk:evo:engmech:oem_gasket_1_by_dieselvette.jpg?direct&300|}} ((photo by dieselvette of the XLFORUM http://xlforum.net/forums/showthread.php?p=5769573#post5769573)) {{:techtalk:evo:engmech:oem_gasket_1_by_dieselvette.jpg?direct&300|}} ((photo by dieselvette of the XLFORUM http://xlforum.net/forums/showthread.php?p=5769573#post5769573)) | + | {{:techtalk:evo:engmech:oem_gasket_1_by_dieselvette.jpg?direct&300|}} ((photo by dieselvette of the XLFORUM http://xlforum.net/forums/showthread.php?p=5769573#post5769573)) {{:techtalk:evo:engmech:oem_gasket_2_by_dieselvette.jpg?direct&300|}} ((photo by dieselvette of the XLFORUM http://xlforum.net/forums/showthread.php?p=5769573#post5769573)) |
| **Using Cometic Rocker Box Gaskets**: \\ | **Using Cometic Rocker Box Gaskets**: \\ | ||
| Line 170: | Line 173: | ||
| Without the hole through the bolts, the engine can't breathe. \\ | Without the hole through the bolts, the engine can't breathe. \\ | ||
| - | The size of the orifice in the hollow breather bolts makes the crankcase pressure rise higher (or lower) in the process of expelling the gas. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?p=4050323&highlight=breather+bolts#post4050323)) \\ | + | The size of the orifice in the hollow head breather bolts makes the crankcase pressure rise higher (or lower) in the process of expelling the gas. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?p=4050323&highlight=breather+bolts#post4050323)) \\ |
| == 91-03 == | == 91-03 == | ||
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| They also allow the air to leave the vents at a faster rate. \\ | They also allow the air to leave the vents at a faster rate. \\ | ||
| - | 04+ breather bolts (small hole is nominally 1/16" or 1.5875 mm). ((tomcat of the XLFORUM http://xlforum.net/forums/showthread.php?t=2073932&page=19)) ((Folkie of the XLFORUM http://xlforum.net/forums/showthread.php?t=2073932&page=22)) \\ | + | 04+ breather bolts (small hole is nominally 1/16" or 1.5875 mm). ((tomcat of the XLFORUM http://xlforum.net/forums/showthread.php?t=2073932&page=19)) ((Folkie of the XLFORUM http://xlforum.net/forums/showthread.php?t=2073932&page=22)) ((http://xlforum.net/forums/showthread.php?p=5756327#post5756327)) \\ |
| {{:techtalk:evo:engmech:04_up_breather_bolt_3_by_folkie.jpg?direct&300|}} ((photo by Folkie of the XLFORUM http://xlforum.net/forums/showthread.php?p=5756327#post5756327)) {{:techtalk:evo:engmech:04_up_breather_bolt_2_by_folkie.jpg?direct&300|}} ((photo by Folkie of the XLFORUM http://xlforum.net/forums/showthread.php?p=5756327#post5756327)) {{:techtalk:evo:engmech:04_up_breather_bolt_1_by_folkie.jpg?direct&300|}} ((photo by Folkie of the XLFORUM http://xlforum.net/forums/showthread.php?p=5756327#post5756327)) | {{:techtalk:evo:engmech:04_up_breather_bolt_3_by_folkie.jpg?direct&300|}} ((photo by Folkie of the XLFORUM http://xlforum.net/forums/showthread.php?p=5756327#post5756327)) {{:techtalk:evo:engmech:04_up_breather_bolt_2_by_folkie.jpg?direct&300|}} ((photo by Folkie of the XLFORUM http://xlforum.net/forums/showthread.php?p=5756327#post5756327)) {{:techtalk:evo:engmech:04_up_breather_bolt_1_by_folkie.jpg?direct&300|}} ((photo by Folkie of the XLFORUM http://xlforum.net/forums/showthread.php?p=5756327#post5756327)) | ||
