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techtalk:evo:engmech07 [2022/05/12 18:20] hippysmack [Symptoms of Breather problems] |
techtalk:evo:engmech07 [2022/05/12 18:35] hippysmack [Blowing through the vent] |
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| |{{:techtalk:evo:oil:89_cam_cover_1_by_bryan350.jpg?direct&250|}}|{{:techtalk:evo:oil:89_cam_cover_2_by_bryan350.jpg?direct&250|}}|{{:techtalk:evo:oil:89_cam_cover_3_by_bryan350.jpg?direct&250|}}| | |{{:techtalk:evo:oil:89_cam_cover_1_by_bryan350.jpg?direct&250|}}|{{:techtalk:evo:oil:89_cam_cover_2_by_bryan350.jpg?direct&250|}}|{{:techtalk:evo:oil:89_cam_cover_3_by_bryan350.jpg?direct&250|}}| | ||
| | 89 cam cover with breather baffle tube attached (it should be tight but still pull out) ((photos by Bryan350 of the XLFORUM http://xlforum.net/forums/showthread.php?t=1712011)) ||| | | 89 cam cover with breather baffle tube attached (it should be tight but still pull out) ((photos by Bryan350 of the XLFORUM http://xlforum.net/forums/showthread.php?t=1712011)) ||| | ||
| - | |||
| - | **Testing the L84-90 umbrella valve**: \\ | ||
| - | A working valve should help reduce oil mist. ((Four Speed of the XLFORUM http://xlforum.net/forums/showthread.php?p=5745528#post5745528)) \\ | ||
| - | Since it's a one-way valve, air goes out but doesn't come back in. \\ | ||
| - | |||
| - | To make sure the umbrella valve is still working; \\ | ||
| - | Before you position the hose, use a bit of clean pipe and blow gently through the breather. \\ | ||
| - | It should close the valve and stop air flow. | ||
| - | You may have to find an aftermarket replacement if the valve is shot as OEM replacements are hard to come by now. \\ | ||
| - | The 5 speed ones do not fit. | ||
| ====== 1991-2003 Sportster Breather Valve ====== | ====== 1991-2003 Sportster Breather Valve ====== | ||
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| ====== Breather Valve Testing ====== | ====== Breather Valve Testing ====== | ||
| + | [[techtalk:ref:engmech04#crankcase_pressure_testing|Click Here]] for information on testing crankcase pressure in the Sportsterpedia. \\ | ||
| + | |||
| There are no service intervals for the breather valve(s) in the FSMs. Also, there is no method of testing them in the FSMs. \\ | There are no service intervals for the breather valve(s) in the FSMs. Also, there is no method of testing them in the FSMs. \\ | ||
| But when they harden over time, you might experience more oil vapor, oil droplets or oil puking out the breather vent(s). \\ | But when they harden over time, you might experience more oil vapor, oil droplets or oil puking out the breather vent(s). \\ | ||
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| The oil on the soaked mesh can vapor off if it doesn't cool on shutdown and gunk up there. If it gunks up, the mesh should be pulled and cleaned or replaced. \\ | The oil on the soaked mesh can vapor off if it doesn't cool on shutdown and gunk up there. If it gunks up, the mesh should be pulled and cleaned or replaced. \\ | ||
| + | ===== Test for air flow at the vent ===== | ||
| You can verify a stopped up breather valve by "feeling" for air moving from the breather vent(s) with the air cleaner off, finger near each vent. \\ | You can verify a stopped up breather valve by "feeling" for air moving from the breather vent(s) with the air cleaner off, finger near each vent. \\ | ||
| As long as you have know air is moving, then the breather valve isn't stopped up. \\ | As long as you have know air is moving, then the breather valve isn't stopped up. \\ | ||
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| {{:techtalk:evo:engmech:2004-up_breather_vent_-_how_air_vacuum_closes_it_by_hippysmack.png?direct&500|}} ((drawing by Hippysmack)) \\ | {{:techtalk:evo:engmech:2004-up_breather_vent_-_how_air_vacuum_closes_it_by_hippysmack.png?direct&500|}} ((drawing by Hippysmack)) \\ | ||
| + | |||
| + | ===== Blow testing through the vent ===== | ||
| + | |||
| + | |||
| + | Since it's a one-way valve, air should go out but not come back in (past the umbrella itself). \\ | ||
| + | |||
| + | Before you position the hose, you can use a bit of clean pipe and blow gently through the breather. ((Four Speed of the XLFORUM http://xlforum.net/forums/showthread.php?p=5745528#post5745528)) \\ | ||
| + | It should close the valve and stop air flow (if you use a quick hard breath). \\ | ||
| + | However, blowing slow and gently will allow a small amount of breath to go into the engine through the tiny oil drainback hole. \\ | ||
| + | You may have to find an aftermarket replacement if the valve is shot and OEM replacements are hard to come by. \\ | ||
| + | The 5 speed (rocker box) umbrellas are smaller than the 4 speed (cam cover) umbrellas and these won't interchange. \\ | ||
| + | |||
| \\ | \\ | ||
