Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision Next revision | Previous revision Next revision Both sides next revision | ||
|
techtalk:ref:engmech04 [2020/10/06 23:22] hippysmack [Symptoms of Breather problems] |
techtalk:ref:engmech04 [2020/10/08 16:59] hippysmack [Sub Documents] |
||
|---|---|---|---|
| Line 50: | Line 50: | ||
| At that point, the tiny hole is a slight air (atmosphere) intake hole. \\ | At that point, the tiny hole is a slight air (atmosphere) intake hole. \\ | ||
| - | The crankcase air pushes past each breather valve and exits through the heads. \\ | + | The crankcase air pushes past the breather valve and exits the engine out the breather vent (which is factory plumbed into the air cleaner backing plate). \\ |
| - | A hole in each head connects the path from the outlet of the breather vent to atmosphere. \\ | + | |
| - | A hollow bolt installed into each head passes the air into the air cleaner backing plate. \\ | + | {{:techtalk:evo:engmech:86-90_cc_pressure_drawing_by_hippysmack.jpg?direct&300|}} ((drawing by Hippysmack)) {{:techtalk:evo:engmech:86-90_engine_crankcase_breathing_by_hippysmack.jpg?direct&300|}} ((drawing by Hippysmack)) |
| ==== 1991-2003 Engine Specifics ==== | ==== 1991-2003 Engine Specifics ==== | ||
| Line 73: | Line 74: | ||
| At that point, the tiny hole is a slight air (atmosphere) intake hole. \\ | At that point, the tiny hole is a slight air (atmosphere) intake hole. \\ | ||
| - | The crankcase air pushes past each breather valve and exits the engine out the breather vent (which is factory plumbed into the air cleaner backing plate). \\ | + | The crankcase air pushes past each breather valve and exits through the heads. \\ |
| + | A hole in each head connects the path from the outlet of the breather vent to atmosphere. \\ | ||
| + | A hollow bolt installed into each head passes the air into the air cleaner backing plate. \\ | ||
| + | |||
| + | {{: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)) | ||
| ==== 2004-Up Engine Specifics ==== | ==== 2004-Up Engine Specifics ==== | ||
| Line 100: | Line 106: | ||
| A hole in each head connects the path from the outlet of the breather vent to atmosphere. \\ | A hole in each head connects the path from the outlet of the breather vent to atmosphere. \\ | ||
| A hollow bolt installed into each head passes the air into the air cleaner backing plate. \\ | A hollow bolt installed into each head passes the air into the air cleaner backing plate. \\ | ||
| - | | + | |
| + | {{: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)) | ||
| ==== OEM oil paths and engine breathing drawings ==== | ==== OEM oil paths and engine breathing drawings ==== | ||
| Line 113: | Line 121: | ||
| ===== Sub Documents ===== | ===== Sub Documents ===== | ||
| * [[techtalk:ref:engmech04k|Breather Valves (1957-Up)]] (list of breather valve changes) | * [[techtalk:ref:engmech04k|Breather Valves (1957-Up)]] (list of breather valve changes) | ||
| + | * [[techtalk:ref:engmech04j|Further Study of Evo Sportster Breather Valves]] | ||
| + | * [[techtalk:ref:engmech07h|Oil Drainback and Supplemental Air Intake from Breather Valves]] | ||
| * [[techtalk:ref:engmech05|Breather Venting / Relocation]] (list of breathing mods and aftermarket breathers) | * [[techtalk:ref:engmech05|Breather Venting / Relocation]] (list of breathing mods and aftermarket breathers) | ||
| * [[techtalk:ref:engmech04l|Head Vents vs Cam Chest Vent]] | * [[techtalk:ref:engmech04l|Head Vents vs Cam Chest Vent]] | ||
| Line 121: | Line 131: | ||
| **The most notable signs of breather valve problems include weeping / leaking gaskets or blown gaskets / seals**. \\ | **The most notable signs of breather valve problems include weeping / leaking gaskets or blown gaskets / seals**. \\ | ||
| - | 77-E82 breather valves can get drudged in old thickened oil and not open/close properly. \\ | ||
| L82-up rubber umbrella(s) get hard and if they don't flex well enough, they'll allow the engine to fully inhaler and exhale on every stroke uncontrolled. \\ | L82-up rubber umbrella(s) get hard and if they don't flex well enough, they'll allow the engine to fully inhaler and exhale on every stroke uncontrolled. \\ | ||
| Stopped up breather valves won't allow the engine to breath well and can create excess vacuum and implode gaskets. \\ | Stopped up breather valves won't allow the engine to breath well and can create excess vacuum and implode gaskets. \\ | ||
