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techtalk:evo:engmech07 [2022/05/12 18:29] hippysmack [Breather Valve Testing] |
techtalk:evo:engmech07 [2022/05/12 18:35] hippysmack [Blowing through the vent] |
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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)) \\ | ||
| - | ===== Blowing through the vent ===== | + | ===== Blow testing through the vent ===== |
| - | **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 (past the umbrella itself). \\ | + | |
| - | 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. \\ | + | Since it's a one-way valve, air should go out but not come back in (past the umbrella itself). \\ |
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| + | 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). \\ | 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. \\ | 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 as OEM replacements are hard to come by now. \\ | + | You may have to find an aftermarket replacement if the valve is shot and OEM replacements are hard to come by. \\ |
| - | The 5 speed ones do not fit. \\ | + | The 5 speed (rocker box) umbrellas are smaller than the 4 speed (cam cover) umbrellas and these won't interchange. \\ |
