Differences
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techtalk:evo:engmech07 [2019/11/14 04:01] hippysmack [2004-Present Engine Breathing] |
techtalk:evo:engmech07 [2020/02/10 17:03] hippysmack [Sub Documents] |
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| * Air pressure escapes the head through the hollow bolts (one in each head) that hold the air cleaner mount. | * Air pressure escapes the head through the hollow bolts (one in each head) that hold the air cleaner mount. | ||
| - | {{:techtalk:evo:engmech:a91-03_sportster_head_breathing_2_drawing_by_hippysmack.jpg?direct&300|}} ((drawing by Hippysmack)) {{:techtalk:evo:oil:crankcase_pressure_separation_chambe_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) | + | {{:techtalk:evo:engmech:91-03_sportster_head_breathing_2_drawing_by_hippysmack.jpg?direct&300|}} ((drawing by Hippysmack)) {{:techtalk:evo:oil:crankcase_pressure_separation_chambe_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) |
| * The Parts Catalog and FSM are a bit confusing regarding how many umbrellas are used and where. \\ The information is there but it's just not clear. \\ The parts catalog only shows an exploded diagram of one rocker box assembly on the Rocker Arms, Covers and Pushrods page. \\ Yet, the description shows that 2 umbrellas are required. \\ It's the same for all of the parts on that page as well as each newer parts catalog (1 pushrod, tube ,lifter and related parts). \\ This is the norm mostly throughout the subsequent catalogs with multiple (same) parts. \\ It's assumed this was done to save money on printing the catalogs (replicated information deleted). \\ The FSM displays the same exploded diagram as the parts catalog in the front of the Cylinder Head section. \\ It's only at the end of the Installation article does it say to install new gaskets on the middle rocker box (with the breather valve on the intake side). \\ There is no dedicated section on the rocker box or umbrella valves (which seem to be regarded as mere gaskets). | * The Parts Catalog and FSM are a bit confusing regarding how many umbrellas are used and where. \\ The information is there but it's just not clear. \\ The parts catalog only shows an exploded diagram of one rocker box assembly on the Rocker Arms, Covers and Pushrods page. \\ Yet, the description shows that 2 umbrellas are required. \\ It's the same for all of the parts on that page as well as each newer parts catalog (1 pushrod, tube ,lifter and related parts). \\ This is the norm mostly throughout the subsequent catalogs with multiple (same) parts. \\ It's assumed this was done to save money on printing the catalogs (replicated information deleted). \\ The FSM displays the same exploded diagram as the parts catalog in the front of the Cylinder Head section. \\ It's only at the end of the Installation article does it say to install new gaskets on the middle rocker box (with the breather valve on the intake side). \\ There is no dedicated section on the rocker box or umbrella valves (which seem to be regarded as mere gaskets). | ||
| Line 120: | Line 120: | ||
| * Air pressure escapes the head through the hollow bolts (one in each head) that hold the air cleaner mount. | * Air pressure escapes the head through the hollow bolts (one in each head) that hold the air cleaner mount. | ||
| - | {{:techtalk:evo:engmech:a04_up_head_breathing_drawing_2_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) | + | {{:techtalk:evo:engmech:04_up_head_breathing_drawing_2_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) |
| Just as with the 91-03 umbrella valves, only 1 breather valve per side is used. \\ | Just as with the 91-03 umbrella valves, only 1 breather valve per side is used. \\ | ||
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| {{:techtalk:evo:engmech:stainless-steel-breather-bolts-1_by_folkie.jpg?direct&300|}} {{:techtalk:evo:engmech:stainless-steel-breather-bolts-2_by_folkie.jpg?direct&300|}} | {{:techtalk:evo:engmech:stainless-steel-breather-bolts-1_by_folkie.jpg?direct&300|}} {{:techtalk:evo:engmech:stainless-steel-breather-bolts-2_by_folkie.jpg?direct&300|}} | ||
| + | ====== Symptoms of Breather problems ====== | ||
| + | Read more here on the [[techtalk:ref:engmech04#engine_breathing|Engine Breathing System]] in the REF section of the Sportsterpedia. \\ | ||
| + | The most noticeable signs of breather valve problems are weeping gaskets or oil excessively leaking out the breather or puking oil out of it. \\ | ||
| + | When the umbrella(s) gets hard, it doesn't flex well to allow the engine to breath out on exhale. \\ | ||
| + | Then the trapped in air is compounded on the next stroke. The excess air contributes to more vacuum created and implodes the gaskets. \\ | ||
| + | Or it contributes to too high of oil density and slings excess oil out. \\ | ||
| + | Other factors are involved so results will vary. \\ | ||
| \\ | \\ | ||
